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Apollo 13

Apollo 13 (April 1117, 1970) was the seventh crewed mission in the Apollo space program and the third meant to land on the Moon. The craft was launched from Kennedy Space Center on April 11, 1970, but the lunar landing was aborted after an oxygen tank in the service module (SM) ruptured two days into the mission, disabling its electrical and life-support system. The crew, supported by backup systems on the lunar module (LM), instead looped around the Moon in a circumlunar trajectory and returned safely to Earth on April 17. The mission was commanded by Jim Lovell, with Jack Swigert as command module (CM) pilot and Fred Haise as lunar module (LM) pilot. Swigert was a late replacement for Ken Mattingly, who was grounded after exposure to rubella.

A routine stir of an oxygen tank ignited damaged wire insulation inside it, causing an explosion that vented the contents of both of the SM's oxygen tanks to space. Without oxygen, needed for breathing and for generating electric power, the SM's propulsion and life support systems could not operate. The CM's systems had to be shut down to conserve its remaining resources for reentry, forcing the crew to transfer to the LM as a lifeboat. With the lunar landing canceled, mission controllers worked to bring the crew home alive.

Although the LM was designed to support two men on the lunar surface for two days, Mission Control in Houston improvised new procedures so it could support three men for four days. The crew experienced great hardship, caused by limited power, a chilly and wet cabin and a shortage of potable water. There was a critical need to adapt the CM's cartridges for the carbon dioxide scrubber system to work in the LM; the crew and mission controllers were successful in improvising a solution. The astronauts' peril briefly renewed public interest in the Apollo program; tens of millions watched the splashdown in the South Pacific Ocean on television.

An investigative review board found fault with preflight testing of the oxygen tank and Teflon being placed inside it. The board recommended changes, including minimizing the use of potentially combustible items inside the tank; this was done for Apollo 14. The story of Apollo 13 has been dramatized several times, most notably in the 1995 film Apollo 13 based on Lost Moon, the 1994 memoir co-authored by Lovell – and an episode of the 1998 miniseries From the Earth to the Moon.

Background
In 1961, U.S. President John F. Kennedy challenged his nation to land an astronaut on the Moon by the end of the decade, with a safe return to Earth. NASA worked towards this goal incrementally, sending astronauts into space during Project Mercury and Project Gemini, leading up to the Apollo program. The goal was achieved with Apollo 11, which landed on the Moon on July 20, 1969. Neil Armstrong and Buzz Aldrin walked on the lunar surface while Michael Collins orbited the Moon in Command Module Columbia. The mission returned to Earth on July 24, 1969, fulfilling Kennedy's challenge.

NASA had contracted for fifteen Saturn V rockets to achieve the goal; at the time no one knew how many missions this would require. Since success was obtained in 1969 with the sixth SaturnV on Apollo 11, nine rockets remained available for a hoped-for total of ten landings. After the excitement of Apollo 11, the general public grew apathetic towards the space program and Congress continued to cut NASA's budget; Apollo 20 was canceled. Despite the successful lunar landing, the missions were considered so risky that astronauts could not afford life insurance to provide for their families if they died in space.

Even before the first U.S. astronaut entered space in 1961, planning for a centralized facility to communicate with the spacecraft and monitor its performance had begun, for the most part the brainchild of Christopher C. Kraft Jr., who became NASA's first flight director. During John Glenn's Mercury Friendship 7 flight in February 1962 (the first crewed orbital flight by the U.S.), one of Kraft's decisions was overruled by NASA managers. He was vindicated by post-mission analysis and implemented a rule that, during the mission, the flight director's word was absolute – to overrule him, NASA would have to fire him on the spot. Flight directors during Apollo had a one-sentence job description, "The flight director may take any actions necessary for crew safety and mission success."

In 1965, Houston's Mission Control Center opened, in part designed by Kraft and now named for him. In Mission Control, each flight controller, in addition to monitoring telemetry from the spacecraft, was in communication via voice loop to specialists in a Staff Support Room (or "back room"), who focused on specific spacecraft systems.

Apollo 13 was to be the second H mission, meant to demonstrate precision lunar landings and explore specific sites on the Moon. With Kennedy's goal accomplished by Apollo 11, and Apollo 12 demonstrating that the astronauts could perform a precision landing, mission planners were able to focus on more than just landing safely and having astronauts minimally trained in geology gather lunar samples to take home to Earth. There was a greater role for science on Apollo 13, especially for geology, something emphasized by the mission's motto, Ex luna, scientia (From the Moon, knowledge).

Astronauts and key Mission Control personnel

Apollo 13's mission commander, Jim Lovell, was 42 years old at the time of the spaceflight. He was a graduate of the United States Naval Academy and had been a naval aviator and test pilot before being selected for the second group of astronauts in 1962; he flew with Frank Borman in Gemini 7 in 1965 and Buzz Aldrin in Gemini 12 the following year before flying in Apollo 8 in 1968, the first spacecraft to orbit the Moon. At the time of Apollo 13, Lovell was the NASA astronaut with the most time in space, with 572 hours over the three missions.

Jack Swigert, the command module pilot (CMP), was 38 years old and held a B.S. in mechanical engineering and an M.S. in aerospace science; he had served in the Air Force and in state Air National Guards and was an engineering test pilot before being selected for the fifth group of astronauts in 1966. Fred Haise, the lunar module pilot (LMP), was 35 years old. He held a B.S. in aeronautical engineering, had been a Marine Corps fighter pilot, and was a civilian research pilot for NASA when he was selected as a Group5 astronaut.

According to the standard Apollo crew rotation, the prime crew for Apollo 13 would have been the backup crew for Apollo 10, with Mercury and Gemini veteran Gordon Cooper in command, Donn F. Eisele as CMP and Edgar Mitchell as LMP. Deke Slayton, NASA's Director of Flight Crew Operations, never intended to rotate Cooper and Eisele to a prime crew assignment, as both were out of favor – Cooper for his lax attitude towards training, and Eisele for incidents aboard Apollo7 and an extramarital affair. He assigned them to the backup crew because no other veteran astronauts were available. Slayton's original choices for Apollo 13 were Alan Shepard as commander, Stuart Roosa as CMP, and Mitchell as LMP. However, management felt Shepard needed more training time, as he had only recently resumed active status after surgery for an inner ear disorder and had not flown since 1961. Thus, Lovell's crew (himself, Haise and Ken Mattingly), having all backed up Apollo 11 and being slated for Apollo 14, was swapped with Shepard's.

Swigert was originally CMP of Apollo 13's backup crew, with John Young as commander and Charles Duke as lunar module pilot. Seven days before launch, Duke contracted rubella from a friend of his son. This exposed both the prime and backup crews, who trained together. Of the five, only Mattingly was not immune through prior exposure. Normally, if any member of the prime crew had to be grounded, the remaining crew would be replaced as well, and the backup crew substituted, but Duke's illness ruled this out, so two days before launch, Mattingly was replaced by Swigert. Mattingly never developed rubella and later flew on Apollo 16.

For Apollo, a third crew of astronauts, known as the support crew, was designated in addition to the prime and backup crews used on projects Mercury and Gemini. Slayton created the support crews because James McDivitt, who would command Apollo 9, believed that, with preparation going on in facilities across the US, meetings that needed a member of the flight crew would be missed. Support crew members were to assist as directed by the mission commander. Usually low in seniority, they assembled the mission's rules, flight plan, and checklists, and kept them updated; for Apollo 13, they were Vance D. Brand, Jack Lousma and either William Pogue or Joseph Kerwin.

For Apollo 13, flight directors were Gene Kranz, White team (the lead flight director); Glynn Lunney, Black team; Milton Windler, Maroon team and Gerry Griffin, Gold team. The CAPCOMs (the person in Mission Control, during the Apollo program an astronaut, who was responsible for voice communications with the crew) for Apollo 13 were Kerwin, Brand, Lousma, Young and Mattingly.

Mission insignia and call signs

The Apollo 13 mission insignia depicts the Greek god of the Sun, Apollo, with three horses pulling his chariot across the face of the Moon, and the Earth seen in the distance. This is meant to symbolize the Apollo flights bringing the light of knowledge to all people. The mission motto, Ex luna, scientia ("From the Moon, knowledge"), appears. In choosing it, Lovell adapted the motto of his alma mater, the Naval Academy, Ex scientia, tridens ("From knowledge, sea power").

On the patch, the mission number appeared in Roman numerals as Apollo XIII. It did not have to be modified after Swigert replaced Mattingly, as it is one of only two Apollo mission insignia – the other being Apollo 11 – not to include the names of the crew. It was designed by artist Lumen Martin Winter, who based it on a mural he had painted for the St. Regis Hotel in New York City. The mural was later purchased by actor Tom Hanks, who portrayed Lovell in the movie Apollo 13, and it is now in the Captain James A. Lovell Federal Health Care Center in Illinois.

The mission's motto was in Lovell's mind when he chose the call sign Aquarius for the lunar module, taken from Aquarius, the bringer of water. Some in the media erroneously reported that the call sign was taken from a song by that name from the musical Hair. The command module's call sign, Odyssey, was chosen not only for its Homeric association but to refer to the recent movie, 2001: A Space Odyssey, based on a short story by science fiction author Arthur C. Clarke. In his book, Lovell indicated he chose the name Odyssey because he liked the word and its definition: a long voyage with many changes of fortune.

Due to the accident and the last minute crew change of Jack Swigert replacing Ken Mattingly three days prior to launch, the Apollo 13 Robbins medallions flown aboard the mission were melted down and reminted after the mission to reflect the correct crew, and the absence of a lunar landing date.

Space vehicle
The Saturn V rocket used to carry Apollo 13 to the Moon was numbered SA-508, and was almost identical to those used on Apollo8 through 12. Including the spacecraft, the rocket weighed in at 6501733 lb. The S-IC first stage's engines were rated to generate 100000 lbf less total thrust than Apollo 12's, though they remained within specifications. To keep its liquid hydrogen propellent cold, the S-II second stage's cryogenic tanks were insulated; on earlier Apollo missions this came in the form of panels that were affixed, but beginning with Apollo 13, insulation was sprayed onto the exterior of the tanks. Extra propellant was carried as a test, since future J missions to the Moon would require more propellant for their heavier payloads. This made the vehicle the heaviest yet flown by NASA, and Apollo 13 was visibly slower to clear the launch tower than earlier missions.

The Apollo 13 spacecraft consisted of Command Module 109 and Service Module 109 (together CSM-109), called Odyssey, and Lunar Module7 (LM-7), called Aquarius. Also considered part of the spacecraft was the launch escape system, which would propel the command module (CM) to safety in the event of a problem during liftoff, and the Spacecraft–LM Adapter, numbered as SLA-16, which housed the lunar module (LM) during the first hours of the mission.

The LM stages, CM and service module (SM) were received at Kennedy Space Center (KSC) in June 1969; the portions of the Saturn V were received in June and July. Thereafter, testing and assembly proceeded, culminating with the rollout of the launch vehicle, with the spacecraft atop it, on December 15, 1969. Apollo 13 was originally scheduled for launch on March 12, 1970; in January of that year, NASA announced the mission would be postponed until April 11, both to allow more time for planning and to spread the Apollo missions over a longer period of time. The plan was to have two Apollo flights per year and was in response to budgetary constraints that had recently seen the cancellation of Apollo 20.

Training and preparation

The Apollo 13 prime crew undertook over 1,000 hours of mission-specific training, more than five hours for every hour of the mission's ten-day planned duration. Each member of the prime crew spent over 400 hours in simulators of the CM and (for Lovell and Haise) of the LM at KSC and at Houston, some of which involved the flight controllers at Mission Control. Flight controllers participated in many simulations of problems with the spacecraft in flight, which taught them how to react in an emergency. Specialized simulators at other locations were also used by the crew members.

The astronauts of Apollo 11 had minimal time for geology training, with only six months between crew assignment and launch; higher priorities took much of their time. Apollo 12 saw more such training, including practice in the field, using a CAPCOM and a simulated backroom of scientists, to whom the astronauts had to describe what they saw. Scientist-astronaut Harrison Schmitt saw that there was limited enthusiasm for geology field trips. Believing an inspirational teacher was needed, Schmitt arranged for Lovell and Haise to meet his old professor, Caltech's Lee Silver. The two astronauts, and backups Young and Duke, went on a field trip with Silver at their own time and expense. At the end of their week together, Lovell made Silver their geology mentor, who would be extensively involved in the geology planning for Apollo 13. Farouk El-Baz oversaw the training of Mattingly and his backup, Swigert, which involved describing and photographing simulated lunar landmarks from airplanes. El-Baz had all three prime crew astronauts describe geologic features they saw during their flights between Houston and KSC; Mattingly's enthusiasm caused other astronauts, such as Apollo 14's CMP, Roosa, to seek out El-Baz as a teacher.

Concerned about how close Apollo 11's LM, Eagle, had come to running out of propellant during its lunar descent, mission planners decided that beginning with Apollo 13, the CSM would bring the LM to the low orbit from which the landing attempt would commence. This was a change from Apollo 11 and 12, on which the LM made the burn to bring it to the lower orbit. The change was part of an effort to increase the amount of hover time available to the astronauts as the missions headed into rougher terrain.

The plan was to devote the first of the two four-hour lunar surface extravehicular activities (EVAs) to setting up the Apollo Lunar Surface Experiments Package (ALSEP) group of scientific instruments; during the second, Lovell and Haise would investigate Cone crater, near the planned landing site. The two astronauts wore their spacesuits for some 20 walk-throughs of EVA procedures, including sample gathering and use of tools and other equipment. They flew in the "Vomit Comet" in simulated microgravity or lunar gravity, including practice in donning and doffing spacesuits. To prepare for the descent to the Moon's surface, Lovell flew the Lunar Landing Training Vehicle (LLTV) after receiving helicopter training. Despite the crashes of one LLTV and one similar Lunar Landing Research Vehicle (LLRV) prior to Apollo 13, mission commanders considered flying them invaluable experience and so prevailed on reluctant NASA management to retain them.

Experiments and scientific objectives

Apollo 13's designated landing site was near Fra Mauro crater; the Fra Mauro formation was believed to contain much material spattered by the impact that had filled the Imbrium basin early in the Moon's history. Dating it would provide information not only about the Moon, but about the Earth's early history. Such material was likely to be available at Cone crater, a site where an impact was believed to have drilled deep into the lunar regolith.

Apollo 11 had left a seismometer on the Moon, but the solar-powered unit did not survive its first two-week-long lunar night. The Apollo 12 astronauts also left one as part of its ALSEP, which was nuclear-powered. Apollo 13 also carried a seismometer (known as the Passive Seismic Experiment, or PSE), similar to Apollo 12's, as part of its ALSEP, to be left on the Moon by the astronauts. That seismometer was to be calibrated by the impact, after jettison, of the ascent stage of Apollo 13's LM, an object of known mass and velocity impacting at a known location.

Other ALSEP experiments on Apollo 13 included a Heat Flow Experiment (HFE), which would involve drilling two holes 10 ft deep. This was Haise's responsibility; he was also to drill a third hole of that depth for a core sample. A Charged Particle Lunar Environment Experiment (CPLEE) measured the protons and electrons of solar origin reaching the Moon. The package also included a Lunar Atmosphere Detector (LAD) and a Dust Detector, to measure the accumulation of debris. The Heat Flow Experiment and the CPLEE were flown for the first time on Apollo 13; the other experiments had been flown before.

To power the ALSEP, the SNAP-27 radioisotope thermoelectric generator (RTG) was flown. Developed by the U.S. Atomic Energy Commission, SNAP-27 was first flown on Apollo 12. The fuel capsule contained about 8.36 lb of plutonium oxide. The cask placed around the capsule for transport to the Moon was built with heat shields of graphite and of beryllium, and with structural parts of titanium and of Inconel materials. Thus, it was built to withstand the heat of reentry into the Earth's atmosphere rather than pollute the air with plutonium in the event of an aborted mission.

A United States flag was also taken, to be erected on the Moon's surface. For Apollo 11 and 12, the flag had been placed in a heat-resistant tube on the front landing leg; it was moved for Apollo 13 to the Modularized Equipment Stowage Assembly (MESA) in the LM descent stage. The structure to fly the flag on the airless Moon was improved from Apollo 12's.

For the first time, red stripes were placed on the helmet, arms and legs of the commander's A7L spacesuit. This was done as, after Apollo 11, those reviewing the images taken had trouble distinguishing Armstrong from Aldrin, but the change was approved too late for Apollo 12. New drink bags that attached inside the helmets and were to be sipped from as the astronauts walked on the Moon were demonstrated by Haise during Apollo 13's final television broadcast before the accident.

Apollo 13's primary mission objectives were to: "Perform selenological inspection, survey, and sampling of materials in a preselected region of the Fra Mauro Formation. Deploy and activate an Apollo Lunar Surface Experiments Package. Develop man's capability to work in the lunar environment. Obtain photographs of candidate exploration sites." The astronauts were also to accomplish other photographic objectives, including of the Gegenschein from lunar orbit, and of the Moon itself on the journey back to Earth. Some of this photography was to be performed by Swigert as Lovell and Haise walked on the Moon. Swigert was also to take photographs of the Lagrangian points of the Earth-Moon system. Apollo 13 had twelve cameras on board, including those for television and moving pictures. The crew was also to downlink bistatic radar observations of the Moon. None of these was attempted because of the accident.

Launch and translunar injection
The mission was launched at the planned time, 2:13:00 pm EST (19:13:00 UTC) on April 11. An anomaly occurred when the second-stage, center (inboard) engine shut down about two minutes early. This was caused by severe pogo oscillations. Starting with Apollo 10, the vehicle's guidance system was designed to shut the engine down in response to chamber pressure excursions. Pogo oscillations had occurred on Titan rockets (used during the Gemini program) and on previous Apollo missions, but on Apollo 13 they were amplified by an interaction with turbopump cavitation. A fix to prevent pogo was ready for the mission, but schedule pressure did not permit the hardware's integration into the Apollo 13 vehicle. A post-flight investigation revealed the engine was one cycle away from catastrophic failure. The four outboard engines and the S-IVB third stage burned longer to compensate, and the vehicle achieved very close to the planned circular 100 nmi parking orbit, followed by a translunar injection (TLI) about two hours later, setting the mission on course for the Moon.

After TLI, Swigert performed the separation and transposition maneuvers before docking the CSM Odyssey to the LM Aquarius, and the spacecraft pulled away from the third stage. Ground controllers then sent the third stage on a course to impact the Moon in range of the Apollo 12 seismometer, which it did just over three days into the mission.

The crew settled in for the three-day trip to Fra Mauro. At 30:40:50 into the mission, with the TV camera running, the crew performed a burn to place Apollo 13 on a hybrid trajectory. The departure from a free-return trajectory meant that if no further burns were performed, Apollo 13 would miss Earth on its return trajectory, rather than intercept it, as with a free return. A free return trajectory could only reach sites near the lunar equator; a hybrid trajectory, which could be started at any point after TLI, allowed sites with higher latitudes, such as Fra Mauro, to be reached. Communications were enlivened when Swigert realized that in the last-minute rush, he had omitted to file his federal income tax return (due April 15), and amid laughter from mission controllers, asked how he could get an extension. He was found to be entitled to a 60-day extension for being out of the country at the deadline.

Entry into the LM to test its systems had been scheduled for 58:00:00; when the crew awoke on the third day of the mission, they were informed it had been moved up three hours and was later moved up again by another hour. A television broadcast was scheduled for 55:00:00; Lovell, acting as emcee, showed the audience the interiors of Odyssey and Aquarius. The audience was limited since none of the television networks were carrying the broadcast, forcing Marilyn Lovell (Jim Lovell's wife) to go to the VIP room at Mission Control if she wanted to watch her husband and his crewmates.

Accident
About six and a half minutes after the TV broadcast – approaching 56:00:00 – Apollo 13 was about 180000 nmi from Earth. Haise was completing the shutdown of the LM after testing its systems while Lovell stowed the TV camera. Jack Lousma, the CAPCOM, sent minor instructions to Swigert, including changing the attitude of the craft to facilitate photography of Comet Bennett.

The pressure sensor in one of the SM's oxygen tanks had earlier appeared to be malfunctioning, so Sy Liebergot (the EECOM, in charge of monitoring the CSM's electrical system) requested that the stirring fans in the tanks be activated. Normally this was done once daily; a stir would destratify the contents of the tanks, making the pressure readings more accurate. The Flight Director, Kranz, had Liebergot wait a few minutes for the crew to settle down after the telecast, then Lousma relayed the request to Swigert, who activated the switches controlling the fans, and after a few seconds turned them off again.

Ninety-five seconds after Swigert activated those switches, the astronauts heard a "pretty large bang", accompanied by fluctuations in electrical power and the firing of the attitude control thrusters. Communications and telemetry to Earth were lost for 1.8 seconds, until the system automatically corrected by switching the high-gain S-band antenna, used for translunar communications, from narrow-beam to wide-beam mode. The accident happened at 55:54:53 (03:08 UTC on April 14, 10:08 PM EST, April 13). Swigert reported 26 seconds later, "Okay, Houston, we've had a problem here," echoed at 55:55:42 by Lovell, "Houston, we've had a problem. We've had a Main B Bus undervolt." William Fenner was the guidance officer (GUIDO) who was the first to report a problem in the control room to Kranz.

Lovell's initial thought on hearing the noise was that Haise had activated the LM's cabin-repressurization valve, which also produced a bang (Haise enjoyed doing so to startle his crewmates), but Lovell could see that Haise had no idea what had happened. Swigert initially thought that a meteoroid might have struck the LM, but he and Lovell quickly realized there was no leak. The "Main Bus B undervolt" meant that there was insufficient voltage produced by the SM's three fuel cells (fueled by hydrogen and oxygen piped from their respective tanks) to the second of the SM's two electric power distribution systems. Almost everything in the CSM required power. Although the bus momentarily returned to normal status, soon both buses A and B were short on voltage. Haise checked the status of the fuel cells and found that two of them were dead. Mission rules forbade entering lunar orbit unless all fuel cells were operational.

In the minutes after the accident, there were several unusual readings, showing that tank2 was empty and tank1's pressure slowly falling, that the computer on the spacecraft had reset and that the high-gain antenna was not working. Liebergot initially missed the worrying signs from tank2 following the stir, as he was focusing on tank1, believing that its reading would be a good guide to what was present in tank2, as did controllers supporting him in the "back room". When Kranz questioned Liebergot on this, he initially responded that there might be false readings due to an instrumentation problem; he was often teased about that in the years to come. Lovell, looking out the window, reported "a gas of some sort" venting into space, making it clear that there was a serious problem.

Since the fuel cells needed oxygen to operate, when Oxygen Tank1 ran dry, the remaining fuel cell would shut down, meaning the CSM's only significant sources of power and oxygen would be the CM's batteries and its oxygen "surge tank". These would be needed for the final hours of the mission, but the remaining fuel cell, already starved for oxygen, was drawing from the surge tank. Kranz ordered the surge tank isolated, saving its oxygen, but this meant that the remaining fuel cell would die within two hours, as the oxygen in tank1 was consumed or leaked away. The volume surrounding the spacecraft was filled with myriad small bits of debris from the accident, complicating any efforts to use the stars for navigation. The mission's goal became simply getting the astronauts back to Earth alive.

Looping around the Moon
The lunar module had charged batteries and full oxygen tanks for use on the lunar surface, so Kranz directed that the astronauts power up the LM and use it as a "lifeboat" – a scenario anticipated but considered unlikely. Procedures for using the LM in this way had been developed by LM flight controllers after a training simulation for Apollo 10 in which the LM was needed for survival, but could not be powered up in time. Had Apollo 13's accident occurred on the return voyage, with the LM already jettisoned, the astronauts would have died, as they would have following an explosion in lunar orbit, including one while Lovell and Haise walked on the Moon.

A key decision was the choice of return path. A "direct abort" would use the SM's main engine (the Service Propulsion System or SPS) to return before reaching the Moon. However, the accident could have damaged the SPS, and the fuel cells would have to last at least another hour to meet its power requirements, so Kranz instead decided on a longer route: the spacecraft would swing around the Moon before heading back to Earth. Apollo 13 was on the hybrid trajectory which was to take it to Fra Mauro; it now needed to be brought back to a free return. The LM's Descent Propulsion System (DPS), although not as powerful as the SPS, could do this, but new software for Mission Control's computers needed to be written by technicians as it had never been contemplated that the CSM/LM spacecraft would have to be maneuvered from the LM. As the CM was being shut down, Lovell copied down its guidance system's orientation information and performed hand calculations to transfer it to the LM's guidance system, which had been turned off; at his request Mission Control checked his figures. At 61:29:43.49 the DPS burn of 34.23 seconds took Apollo 13 back to a free return trajectory.

The change would get Apollo 13 back to Earth in about four days' time – though with splashdown in the Indian Ocean, where NASA had few recovery forces. Jerry Bostick and other Flight Dynamics Officers (FIDOs) were anxious both to shorten the travel time and to move splashdown to the Pacific Ocean, where the main recovery forces were located. One option would shave 36 hours off the return time, but required jettisoning the SM; this would expose the CM's heat shield to space during the return journey, something for which it had not been designed. The FIDOs also proposed other solutions. After a meeting involving NASA officials and engineers, the senior individual present, Manned Spaceflight Center director Robert R. Gilruth, decided on a burn using the DPS, that would save 12 hours and land Apollo 13 in the Pacific. This "PC+2" burn would take place two hours after pericynthion, the closest approach to the Moon. At pericynthion, Apollo 13 set the record (per the Guinness Book of World Records), which still stands, for the furthest distance from Earth by a crewed spacecraft: 400171 km from Earth at 7:21 pm EST, April 14 (00:21:00 UTC April 15).

While preparing for the burn, the crew was told that the S-IVB had impacted the Moon as planned, leading Lovell to quip, "Well, at least something worked on this flight." Kranz's White team of mission controllers, who had spent most of their time supporting other teams and developing the procedures urgently needed to get the astronauts home, took their consoles for the PC+2 procedure. Normally, the accuracy of such a burn could be assured by checking the alignment Lovell had transferred to the LM's computer against the position of one of the stars astronauts used for navigation, but the light glinting off the many pieces of debris accompanying the spacecraft made that impractical. The astronauts accordingly used the one star available whose position could not be obscured – the Sun. Houston also informed them that the Moon would be centered in the commander's window of the LM as they made the burn, which was almost perfect – less than 0.3 meters (1 foot) per second off. The burn, at 79:27:38.95, lasted four minutes and 23 seconds. The crew then shut down most LM systems to conserve consumables.

Return to Earth

The LM carried enough oxygen, but that still left the problem of removing carbon dioxide, which was absorbed by canisters of lithium hydroxide pellets. The LM's stock of canisters, meant to accommodate two astronauts for 45 hours on the Moon, was not enough to support three astronauts for the return journey to Earth. The CM had enough canisters, but they were of a different shape and size to the LM's, hence unable to be used in the LM's equipment. Engineers on the ground devised a way to bridge the gap, using plastic covers ripped from procedure manuals, duct tape, and other items available on the spacecraft. NASA engineers referred to the improvised device as "the mailbox". The procedure for building the device was read to the crew by CAPCOM Joseph Kerwin over the course of an hour, and was built by Swigert and Haise; carbon dioxide levels began dropping immediately. Lovell later described this improvisation as "a fine example of cooperation between ground and space".

The CSM's electricity came from fuel cells that produced water as a byproduct, but the LM was powered by silver-zinc batteries which did not, so both electrical power and water (needed for equipment cooling as well as drinking) would be critical. LM power consumption was reduced to the lowest level possible; Swigert was able to fill some drinking bags with water from the CM's water tap, but even assuming rationing of personal consumption, Haise initially calculated they would run out of water for cooling about five hours before reentry. This seemed acceptable because the systems of Apollo 11's LM, once jettisoned in lunar orbit, had continued to operate for seven to eight hours even with the water cut off. In the end, Apollo 13 returned to Earth with 28.2 lb of water remaining. The crew's ration was 0.2 liters (6.8 fl oz) of water per person per day; the three astronauts lost a total of 31 lb among them, and Haise developed a urinary tract infection. This infection was probably caused by the reduced water intake, but microgravity and effects of cosmic radiation might have impaired his immune system's reaction to the pathogen.

Inside the darkened spacecraft, the temperature dropped as low as 38 F. Lovell considered having the crew don their spacesuits, but decided this would be too hot. Instead, Lovell and Haise wore their lunar EVA boots and Swigert put on an extra coverall. All three astronauts were cold, especially Swigert, who had got his feet wet while filling the water bags and had no lunar overshoes (since he had not been scheduled to walk on the Moon). As they had been told not to discharge their urine to space to avoid disturbing the trajectory, they had to store it in bags. Water condensed on the walls, though any condensation that may have been behind equipment panels caused no problems, partly because of the extensive electrical insulation improvements instituted after the Apollo 1 fire. Despite all this, the crew voiced few complaints.

Flight controller John Aaron, along with Mattingly and several engineers and designers, devised a procedure for powering up the command module from full shutdown – something never intended to be done in flight, much less under Apollo 13's severe power and time constraints. The astronauts implemented the procedure without apparent difficulty: Kranz later credited all three astronauts having been test pilots, accustomed to having to work in critical situations with their lives on the line, for their survival.

Recognizing that the cold conditions combined with insufficient rest would hinder the time critical startup of the command module prior to reentry, at 133 hours into flight Mission Control gave Lovell the okay to fully power up the LM to raise the cabin temperature, which included restarting the LM's guidance computer. Having the LM's computer running enabled Lovell to perform a navigational sighting and calibrate the LM's Inertial Measurement Unit (IMU). With the lunar module's computer aware of its location and orientation, the command module's computer was later calibrated in a reverse of the normal procedures used to set up the LM, shaving steps from the restart process and increasing the accuracy of the PGNCS-controlled reentry.

Reentry and splashdown
Despite the accuracy of the transearth injection, the spacecraft slowly drifted off course, necessitating a correction. As the LM's guidance system had been shut down following the PC+2 burn, the crew was told to use the line between night and day on the Earth to guide them, a technique used on NASA's Earth-orbit missions but never on the way back from the Moon. This DPS burn, at 105:18:42 for 14 seconds, brought the projected entry flight path angle back within safe limits. Nevertheless, yet another burn was needed at 137:40:13, using the LM's reaction control system (RCS) thrusters, for 21.5 seconds. The SM was jettisoned less than half an hour later, allowing the crew to see the damage for the first time, and photograph it. They reported that an entire panel was missing from the SM's exterior, the fuel cells above the oxygen tank shelf were tilted, that the high-gain antenna was damaged, and there was a considerable amount of debris elsewhere. Haise could see possible damage to the SM's engine bell, validating Kranz's decision not to use the SPS. The crew then moved out of the LM back into the CM and reactivated its life support systems.

The last problem to be solved was how to separate the lunar module a safe distance away from the command module just before reentry. The normal procedure, in lunar orbit, was to release the LM and then use the service module's RCS to pull the CSM away, but by this point, the SM had already been released. Grumman, manufacturer of the LM, assigned a team of University of Toronto engineers, led by senior scientist Bernard Etkin, to solve the problem of how much air pressure to use to push the modules apart. The astronauts applied the solution, which was successful. The LM reentered Earth's atmosphere and was destroyed, the remaining pieces falling in the deep ocean. Apollo 13's final midcourse correction had addressed the concerns of the Atomic Energy Commission, which wanted the cask containing the plutonium oxide intended for the SNAP-27 RTG to land in a safe place. The impact point was over the Tonga Trench in the Pacific, one of its deepest points, and the cask sank 10 km to the bottom. Later helicopter surveys found no radioactive leakage.

Ionization of the air around the command module during reentry would typically cause a four-minute communications blackout. Apollo 13's shallow reentry path lengthened this to six minutes, longer than had been expected; controllers feared that the CM's heat shield had failed. Odyssey regained radio contact and splashed down safely in the South Pacific Ocean, -21.64°N, -165.36167°W, southeast of American Samoa and 6.5 km from the recovery ship, USS Iwo Jima. Although fatigued, the crew was in good condition except for Haise, who had developed a serious urinary tract infection because of insufficient water intake. The crew stayed overnight on the ship and flew to Pago Pago, American Samoa, the next day. They flew to Hawaii, where President Richard Nixon awarded them the Presidential Medal of Freedom, the highest civilian honor. They stayed overnight, and then were flown back to Houston.

En route to Honolulu, President Nixon stopped at Houston to award the Presidential Medal of Freedom to the Apollo 13 Mission Operations Team. He originally planned to give the award to NASA administrator Thomas O. Paine, but Paine recommended the mission operations team.

Public and media reaction

Worldwide interest in the Apollo program was reawakened by the incident; television coverage was seen by millions. Four Soviet ships headed toward the landing area to assist if needed, and other nations offered assistance should the craft have to splash down elsewhere. President Nixon canceled appointments, phoned the astronauts' families, and drove to NASA's Goddard Space Flight Center in Greenbelt, Maryland, where Apollo's tracking and communications were coordinated.

The rescue received more public attention than any spaceflight to that point, other than the first Moon landing on Apollo 11. There were worldwide headlines, and people surrounded television sets to get the latest developments, offered by networks who interrupted their regular programming for bulletins. Pope Paul VI led a congregation of 10,000 people in praying for the astronauts' safe return; ten times that number offered prayers at a religious festival in India. The United States Senate on April 14 passed a resolution urging businesses to pause at 9:00pm local time that evening to allow for employee prayer.

An estimated 40million Americans watched Apollo13's splashdown, carried live on all three networks, with another 30million watching some portion of the 6½ hour telecast. Even more outside the U.S. watched. Jack Gould of The New York Times stated that Apollo13, "which came so close to tragic disaster, in all probability united the world in mutual concern more fully than another successful landing on the Moon would have".

Review board
Immediately upon the crew's return, NASA Administrator Paine and Deputy Administrator George Low appointed a review board to investigate the accident. Chaired by NASA Langley Research Center Director Edgar M. Cortright and including Neil Armstrong and six others, the board sent its final report to Paine on June 15. It found that the failure began in the service module's number2 oxygen tank. Damaged Teflon insulation on the wires to the stirring fan inside Oxygen Tank2 allowed the wires to short circuit and ignite this insulation. The resulting fire increased the pressure inside the tank until the tank dome failed, filling the fuel cell bay (SM Sector4) with rapidly expanding gaseous oxygen and combustion products. The pressure rise was sufficient to pop the rivets holding the aluminum exterior panel covering Sector4 and blow it out, exposing the sector to space and snuffing out the fire. The detached panel hit the nearby high-gain antenna, disabling the narrow-beam communication mode and interrupting communication with Earth for 1.8 seconds while the system automatically switched to the backup wide-beam mode. The sectors of the SM were not airtight from each other, and had there been time for the entire SM to become as pressurized as Sector4, the force on the CM's heat shield would have separated the two modules. The report questioned the use of Teflon and other materials shown to be flammable in supercritical oxygen, such as aluminum, within the tank. The board found no evidence pointing to any other theory of the accident.

Mechanical shock forced the oxygen valves closed on the number1 and number3 fuel cells, putting them out of commission. The sudden failure of Oxygen Tank2 compromised Oxygen Tank1, causing its contents to leak out, possibly through a damaged line or valve, over the next 130 minutes, entirely depleting the SM's oxygen supply. With both SM oxygen tanks emptying, and with other damage to the SM, the mission had to be aborted. The board praised the response to the emergency: "The imperfection in Apollo 13 constituted a near disaster, averted only by outstanding performance on the part of the crew and the ground control team which supported them."

Oxygen Tank 2 was manufactured by the Beech Aircraft Company of Boulder, Colorado, as subcontractor to North American Rockwell (NAR) of Downey, California, prime contractor for the CSM. It contained two thermostatic switches, originally designed for the command module's 28-volt DC power, but which could fail if subjected to the 65 volts used during ground testing at KSC. Under the original 1962 specifications, the switches would be rated for 28 volts, but revised specifications issued in 1965 called for 65 volts to allow for quicker tank pressurization at KSC. Nonetheless, the switches Beech used were not rated for 65 volts.

At NAR's facility, Oxygen Tank 2 had been originally installed in an oxygen shelf placed in the Apollo 10 service module, SM-106, but which was removed to fix a potential electromagnetic interference problem and another shelf substituted. During removal, the shelf was accidentally dropped at least 2 in, because a retaining bolt had not been removed. The probability of damage from this was low, but it is possible that the fill line assembly was loose and made worse by the fall. After some retesting (which did not include filling the tank with liquid oxygen), in November 1968 the shelf was re-installed in SM-109, intended for Apollo 13, which was shipped to KSC in June 1969.

The Countdown Demonstration Test took place with SM-109 in its place near the top of the Saturn V and began on March 16, 1970. During the test, the cryogenic tanks were filled, but Oxygen Tank 2 could not be emptied through the normal drain line, and a report was written documenting the problem. After discussion among NASA and the contractors, attempts to empty the tank resumed on March 27. When it would not empty normally, the heaters in the tank were turned on to boil off the oxygen. The thermostatic switches were designed to prevent the heaters from raising the temperature higher than 80 F, but they failed under the 65-volt power supply applied. Temperatures on the heater tube within the tank may have reached 1,000 F, most likely damaging the Teflon insulation. The temperature gauge was not designed to read higher than 85 F, so the technician monitoring the procedure detected nothing unusual. This heating had been approved by Lovell and Mattingly of the prime crew, as well as by NASA managers and engineers. Replacement of the tank would have delayed the mission by at least a month. The tank was filled with liquid oxygen again before launch; once electric power was connected, it was in a hazardous condition. The board found that Swigert's activation of the Oxygen Tank2 fan at the request of Mission Control caused an electric arc that set the tank on fire.

The board conducted a test of an oxygen tank rigged with hot-wire ignitors that caused a rapid rise in temperature within the tank, after which it failed, producing telemetry similar to that seen with the Apollo 13 Oxygen Tank 2. Tests with panels similar to the one that was seen to be missing on SM Sector4 caused separation of the panel in the test apparatus.

Changes in response

For Apollo 14 and subsequent missions, the oxygen tank was redesigned, the thermostats being upgraded to handle the proper voltage. The heaters were retained since they were necessary to maintain oxygen pressure. The stirring fans, with their unsealed motors, were removed, which meant the oxygen quantity gauge was no longer accurate. This required adding a third tank so that no tank would go below half full. The third tank was placed in Bay1 of the SM, on the side opposite the other two, and was given an isolation valve that could isolate it from the fuel cells and from the other two oxygen tanks in an emergency and allow it to feed the CM's environmental system only. The quantity probe was upgraded from aluminum to stainless steel.

All electrical wiring in Bay4 was sheathed in stainless steel. The fuel cell oxygen supply valves were redesigned to isolate the Teflon-coated wiring from the oxygen. The spacecraft and Mission Control monitoring systems were modified to give more immediate and visible warnings of anomalies. An emergency supply of 5 USgal of water was stored in the CM, and an emergency battery, identical to those that powered the LM's descent stage, was placed in the SM. The LM was modified to make transfer of power from the LM to the CM easier.

Aftermath

On February 5, 1971, Apollo 14's LM, Antares, landed on the Moon with astronauts Alan Shepard and Edgar Mitchell aboard, near Fra Mauro, the site Apollo 13 had been intended to explore. Haise served as CAPCOM during the descent to the Moon, and during the second EVA, during which Shepard and Mitchell explored near Cone crater.

None of the Apollo 13 astronauts flew in space again. Lovell retired from NASA and the Navy in 1973, entering the private sector. Swigert was to have flown on the 1975 Apollo–Soyuz Test Project (the first joint mission with the Soviet Union) but was removed as part of the fallout from the Apollo 15 postal covers incident. He took a leave of absence from NASA in 1973 and left the agency to enter politics, being elected to the House of Representatives in 1982, but died of cancer before he could be sworn in. Haise was slated to have been the commander of the canceled Apollo 19 mission, and flew the Space Shuttle Approach and Landing Tests before retiring from NASA in 1979.

Several experiments were completed during Apollo 13, even though the mission did not land on the Moon. One involved the launch vehicle's S-IVB (the Saturn V's third stage), which on prior missions had been sent into solar orbit once detached. The seismometer left by Apollo 12 had detected frequent impacts of small objects onto the Moon, but larger impacts would yield more information about the Moon's crust, so it was decided that, beginning with Apollo 13, the S-IVB would be crashed into the Moon. The impact occurred at 77:56:40 into the mission and produced enough energy that the gain on the seismometer, 73 mi from the impact, had to be reduced. An experiment to measure the amount of atmospheric electrical phenomena during the ascent to orbit – added after Apollo 12 was struck by lightning – returned data indicating a heightened risk during marginal weather. A series of photographs of Earth, taken to test whether cloud height could be determined from synchronous satellites, achieved the desired results.

As a joke, Grumman issued an invoice to North American Rockwell, prime contractor for the CSM, for "towing" the CSM most of the way to the Moon and back. Line items included 400001 miles at $1 each (plus $4 for the first mile); $536.05 for battery charging; oxygen; and four nights at $8 per night for an "additional guest in room" (Swigert). After a 20% "commercial discount", and a 2% discount for timely payment, the final total was $312,421.24. North American declined payment, noting that it had ferried three previous Grumman LMs to the Moon without compensation.

The CM was disassembled for testing and parts remained in storage for years; some were used for a trainer for the Skylab Rescue Mission. That trainer was subsequently displayed at the Kentucky Science Center. Max Ary of the Cosmosphere made it a project to restore Odyssey; it is on display there, in Hutchinson, Kansas.

Apollo 13 was called a "successful failure" by Lovell. Mike Massimino, a Space Shuttle astronaut, stated that Apollo 13 "showed teamwork, camaraderie and what NASA was really made of". The response to the accident has been repeatedly called "NASA's finest hour";  it is still viewed that way. Author Colin Burgess wrote, "the life-or-death flight of Apollo 13 dramatically evinced the colossal risks inherent in manned spaceflight. Then, with the crew safely back on Earth, public apathy set in once again."

William R. Compton, in his book about the Apollo Program, said of Apollo 13, "Only a heroic effort of real-time improvisation by mission operations teams saved the crew." Rick Houston and Milt Heflin, in their history of Mission Control, stated, "Apollo 13 proved mission control could bring those space voyagers back home again when their lives were on the line." Former NASA chief historian Roger D. Launius wrote, "More than any other incident in the history of spaceflight, recovery from this accident solidified the world's belief in NASA's capabilities". Nevertheless, the accident convinced some officials, such as Manned Spaceflight Center director Gilruth, that if NASA kept sending astronauts on Apollo missions, some would inevitably be killed, and they called for as quick an end as possible to the program. Nixon's advisers recommended canceling the remaining lunar missions, saying that a disaster in space would cost him political capital. Budget cuts made such a decision easier, and during the pause after Apollo 13, two missions were canceled, meaning that the program ended with Apollo 17 in December 1972.

Popular culture, media and 50th anniversary
The 1974 movie Houston, We've Got a Problem, while set around the Apollo 13 incident, is a fictional drama about the crises faced by ground personnel when the emergency disrupts their work schedules and places further stress on their lives. Lovell publicly complained about the movie, saying it was "fictitious and in poor taste".

"Houston... We've Got a Problem" was the title of an episode of the BBC documentary series A Life At Stake, broadcast in March 1978. This was an accurate, if simplified, reconstruction of the events. In 1994, during the 25th anniversary of Apollo 11, PBS released a 90-minute documentary titled Apollo 13: To the Edge and Back.

Following the flight, the crew planned to write a book, but they all left NASA without starting it. After Lovell retired in 1991, he was approached by journalist Jeffrey Kluger about writing a non-fiction account of the mission. Swigert died in 1982 and Haise was no longer interested in such a project. The resultant book, Lost Moon: The Perilous Voyage of Apollo 13, was published in 1994.

The next year, in 1995, a film adaptation of the book, Apollo 13, was released, directed by Ron Howard and starring Tom Hanks as Lovell, Bill Paxton as Haise, Kevin Bacon as Swigert, Gary Sinise as Mattingly, Ed Harris as Kranz, and Kathleen Quinlan as Marilyn Lovell. James Lovell, Kranz, and other principals have stated that this film depicted the events of the mission with reasonable accuracy, given that some dramatic license was taken. For example, the film changes the tense of Lovell's famous follow-up to Swigert's original words from, "Houston, we've had a problem" to "Houston, we have a problem". The film also invented the phrase "Failure is not an option", uttered by Harris as Kranz in the film; the phrase became so closely associated with Kranz that he used it for the title of his 2000 autobiography. The film won two of the nine Academy Awards it was nominated for, Best Film Editing and Best Sound.

In the 1998 miniseries From the Earth to the Moon, co-produced by Hanks and Howard, the mission is dramatized in the episode "We Interrupt This Program". Rather than showing the incident from the crew's perspective as in the Apollo 13 feature film, it is instead presented from an Earth-bound perspective of television reporters competing for coverage of the event.

In 2020, the BBC World Service began airing 13 Minutes to the Moon, radio programs which draw on NASA audio from the mission, as well as archival and recent interviews with participants. Episodes began airing for Season 2 starting on March 8, 2020, with episode 1, "Time bomb: Apollo 13", explaining the launch and the explosion. Episode 2 details Mission Control's denial and disbelief of the accident, with other episodes covering other aspects of the mission. The seventh and final episode was delayed due to the COVID-19 pandemic. In "Delay to Episode 7", the BBC explained that the presenter of the series, medical doctor Kevin Fong, had been called into service.

In advance of the 50th anniversary of the mission in 2020, an Apollo in Real Time site for the mission went online, allowing viewers to follow along as the mission unfolds, view photographs and video, and listen to audio of conversations between Houston and the astronauts as well as between mission controllers. Due to the COVID-19 pandemic, NASA did not hold any in-person events during April 2020 for the flight's 50th anniversary, but premiered a new documentary, Apollo 13: Home Safe on April 10, 2020. A number of events were rescheduled for later in 2020.

title: Apollo 13


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Apollo 7

Apollo 7 (October 11–22, 1968) was the first crewed flight in NASA's Apollo program, and saw the resumption of human spaceflight by the agency after the fire that had killed the three Apollo 1 astronauts during a launch rehearsal test on January 27, 1967. The Apollo   7 crew was commanded by Walter M. Schirra, with command module pilot Donn F. Eisele and lunar module pilot R. Walter Cunningham (so designated even though Apollo    7 did not carry a Lunar Module).

The three astronauts were originally designated for the second crewed Apollo flight, and then as backups for Apollo   1. After the Apollo   1 fire, crewed flights were suspended while the cause of the accident was investigated and improvements made to the spacecraft and safety procedures, and uncrewed test flights made. Determined to prevent a repetition of the fire, the crew spent long periods monitoring the construction of their Apollo command and service modules (CSM). Training continued over much of the pause that followed the Apollo    1 disaster.

Apollo 7 was launched on October 11, 1968, from Cape Kennedy Air Force Station, Florida, and splashed down in the Atlantic Ocean eleven days later. Extensive testing of the CSM took place, and also the first live television broadcast from an American spacecraft. Despite tension between the crew and ground controllers, the mission was a complete technical success, giving NASA the confidence to send Apollo 8 into orbit around the Moon two months later. In part because of these tensions, none of the crew flew in space again, though Schirra had already announced he would retire from NASA after the flight. Apollo   7 fulfilled Apollo    1's mission of testing the CSM in low Earth orbit, and was a significant step towards NASA's goal of landing astronauts on the Moon.

Background and personnel
Schirra, one of the original "Mercury Seven" astronauts, graduated from the United States Naval Academy in 1945. He flew Mercury-Atlas 8 in 1962, the fifth crewed flight of Project Mercury and the third to reach orbit, and in 1965 was the command pilot for Gemini 6A. He was a 45-year-old captain in the Navy at the time of Apollo   7. Eisele graduated from the Naval Academy in 1952 with a B.S. in aeronautics. He elected to be commissioned in the Air Force, and was a 38-year-old major at the time of Apollo   7. Cunningham joined the U.S. Navy in 1951, began flight training the following year, and served in a Marine flight squadron from 1953 to 1956, and was a civilian, aged 36, serving in the Marine Corps reserves with a rank of major, at the time of Apollo   7. He received degrees in physics from UCLA, a B.A. in 1960 and an M.A. in 1961. Both Eisele and Cunningham were selected as part of the third group of astronauts in 1963.

Eisele was originally slotted for a position on Gus Grissom's Apollo 1 crew along with Ed White, but days prior to the official announcement on March 25, 1966, Eisele sustained a shoulder injury that would require surgery. Instead, Roger Chaffee was given the position and Eisele was reassigned to Schirra's crew.

Schirra, Eisele, and Cunningham were first named as an Apollo crew on September 29, 1966. They were to fly a second Earth orbital test of the Apollo Command Module (CM). Although delighted as a rookie to be assigned to a prime crew without having served as a backup, Cunningham was troubled by the fact that a second Earth orbital test flight, dubbed Apollo   2, seemed unnecessary if Apollo    1 was successful. He learned later that Director of Flight Crew Operations Deke Slayton, another of the Mercury Seven who had been grounded for medical reasons and supervised the astronauts, planned, with Schirra's support, to command the mission if he gained medical clearance. When this was not forthcoming, Schirra remained in command of the crew, and in November 1966, Apollo   2 was cancelled and Schirra's crew assigned as backup to Grissom's. Thomas P. Stafford—assigned at that point as the backup commander of the second orbital test—stated that the cancellation followed Schirra and his crew submitting a list of demands to NASA management (Schirra wanted the mission to include a lunar module and a CM capable of docking with it), and that the assignment as backups left Schirra complaining that Slayton and Chief Astronaut Alan Shepard had destroyed his career.

On January 27, 1967, Grissom's crew was conducting a launch-pad test for their planned February 21 mission, when a fire broke out in the cabin, killing all three men. A complete safety review of the Apollo program followed. Soon after the fire, Slayton asked Schirra, Eisele and Cunningham to fly the first mission after the pause. Apollo 7 would use the Block   II spacecraft designed for the lunar missions, as opposed to the Block I CSM used for Apollo 1, which was intended only to be used for the early Earth-orbit missions, as it lacked the capability of docking with a lunar module. The CM and astronauts' spacesuits had been extensively redesigned, to reduce any chance of a repeat of the accident which killed the first crew. Schirra's crew would test the life support, propulsion, guidance and control systems during this "open-ended" mission (meaning it would be extended as it passed each test). The duration was limited to 11 days, reduced from the original 14-day limit for Apollo   1.

The backup crew consisted of Stafford as commander, John W. Young as command module pilot, and Eugene A. Cernan as lunar module pilot. They became the prime crew of Apollo 10. Ronald E. Evans, John L. 'Jack' Swigert, and Edward G. Givens were assigned to the support crew for the mission. Givens died in a car accident on June 6, 1967, and William R. Pogue was assigned as his replacement. Evans was involved in hardware testing at Kennedy Space Center (KSC). Swigert was the launch capsule communicator (CAPCOM) and worked on the mission's operational aspects. Pogue spent time modifying procedures. The support crew also filled in when the primary and backup crews were unavailable.

CAPCOMs, the person in Mission Control responsible for communicating with the spacecraft (then always an astronaut) were Evans, Pogue, Stafford, Swigert, Young and Cernan. Flight directors were Glynn Lunney, Gene Kranz and Gerry Griffin.

Preparation
According to Cunningham, Schirra originally had limited interest in making a third spaceflight, beginning to focus on his post-NASA career. Flying the first mission after the fire changed things: "Wally Schirra was being pictured as the man chosen to rescue the manned space program. And that was a task worthy of Wally's interest." Eisele noted, "coming on the heels of the fire, we knew the fate and future of the entire manned space program—not to mention our own skins—was riding on the success or failure of Apollo   7."

Given the circumstances of the fire, the crew initially had little confidence in the staff at North American Aviation's plant at Downey, California, who built the Apollo command modules, and they were determined to follow their craft every step of the way through construction and testing. This interfered with training, but the simulators of the CM were not yet ready, and they knew it would be a long time until they launched. They spent long periods at Downey. Simulators were constructed at Houston's Manned Spacecraft Center and at KSC in Florida. Once these were available for use, the crew had difficulty finding enough time to do everything, even with the help of the backup and support crews; the crew often worked 12 or 14 hours per day. After the CM was completed and shipped to KSC, the focus of the crew's training shifted to Florida, though they went to Houston for planning and technical meetings. Rather than return to their Houston homes for the weekend, they often had to remain at KSC in order to participate in training or spacecraft testing. According to former astronaut Tom Jones in a 2018 article, Schirra, "with indisputable evidence of the risks his crew would be taking, now had immense leverage with management at NASA and North American, and he used it. In conference rooms or on the spacecraft assembly line, Schirra got his way."

The Apollo 7 crew spent five hours in training for every hour they could expect to remain aboard if the mission went its full eleven days. In addition, they attended technical briefings and pilots' meetings, and studied on their own. They undertook launch pad evacuation training, water egress training to exit the vehicle after splashdown, and learned to use firefighting equipment. They trained on the Apollo Guidance Computer at MIT. Each crew member spent 160 hours in CM simulations, in some of which Mission Control in Houston participated live. The "plugs out" test—the test that had killed the Apollo   1 crew—was conducted with the prime crew in the spacecraft, but with the hatch open. One reason the Apollo   1 crew had died was because it was impossible to open the inward-opening hatch before the fire raced through the cabin; this was changed for Apollo    7.

Command modules similar to that used on Apollo   7 were subjected to tests in the run-up to the mission. A three-astronaut crew (Joseph P. Kerwin, Vance D. Brand and Joe H. Engle) was inside a CM that was placed in a vacuum chamber at the Manned Spaceflight Center in Houston for eight days in June 1968 to test spacecraft systems. Another crew (James Lovell, Stuart Roosa and Charles M. Duke) spent 48 hours at sea aboard a CM lowered into the Gulf of Mexico from a naval vessel in April 1968, to test how systems would respond to seawater. Further tests were conducted the following month in a tank at Houston. Fires were set aboard a boilerplate CM using various atmospheric compositions and pressures. The results led to the decision to use 60 percent oxygen and 40 percent nitrogen within the CM at launch, which would be replaced with a lower pressure of pure oxygen within four hours, as providing adequate fire protection. Other boilerplate spacecraft were subjected to drops to test parachutes, and to simulate the likely damage if a CM came down on land. All results were satisfactory.

During the run-up to the mission, the Soviets sent uncrewed probes Zond 4 and Zond 5 (Zond 5 carried two tortoises ) around the Moon, seeming to foreshadow a circumlunar crewed mission. NASA's Lunar Module (LM) was suffering delays, and Apollo Program Spacecraft Manager George Low proposed that if Apollo   7 was a success, that Apollo 8 go to lunar orbit without a LM. The acceptance of Low's proposal raised the stakes for Apollo    7. According to Stafford, Schirra "clearly felt the full weight of the program riding on a successful mission and as a result became more openly critical and more sarcastic."

Throughout the Mercury and Gemini programs, McDonnell Aircraft engineer Guenter Wendt led the spacecraft launch pad teams, with ultimate responsibility for condition of the spacecraft at launch. He earned the astronauts' respect and admiration, including Schirra's. However, the spacecraft contractor had changed from McDonnell (Mercury and Gemini) to North American (Apollo), so Wendt was not the pad leader for Apollo   1. So adamant was Schirra in his desire to have Wendt back as pad leader for his Apollo flight, that he got his boss Slayton to persuade North American management to hire Wendt away from McDonnell, and Schirra personally lobbied North American's launch operations manager to change Wendt's shift from midnight to day so he could be pad leader for Apollo   7. Wendt remained as pad leader for the entire Apollo program. When he departed the spacecraft area as the pad was evacuated prior to launch, after Cunningham said, "I think Guenter's going", Eisele responded "Yes, I think Guenter went."

Spacecraft

The Apollo 7 spacecraft included Command and Service Module 101 (CSM-101), the first Block   II CSM to be flown. The Block   II craft had the capability of docking with a LM, though none was flown on Apollo    7. The spacecraft also included the launch escape system and a spacecraft-lunar module adapter (SLA, numbered as SLA-5), though the latter included no LM and instead provided a mating structure between the SM and the S-IVB's Instrument Unit, with a structural stiffener substituted for the LM. The launch escape system was jettisoned after S-IVB ignition, while the SLA was left behind on the spent S-IVB when the CSM separated from it in orbit.

Following the Apollo 1 fire, the Block   II CSM was extensively redesigned—more than 1,800 changes were recommended, of which 1,300 were implemented for Apollo    7. Prominent among these was the new aluminum and fiberglass outward-opening hatch, which the crew could open in seven seconds from within, and the pad crew in ten seconds from outside. Other changes included replacement of aluminum tubing in the high-pressure oxygen system with stainless steel, replacement of flammable materials with non-flammable (including changing plastic switches for metal ones) and, for crew protection in the event of a fire, an emergency oxygen system to shield them from toxic fumes, as well as firefighting equipment.

After the Gemini 3 craft was dubbed Molly Brown by Grissom, NASA forbade naming spacecraft. Despite this prohibition, Schirra wanted to name his ship "Phoenix," but NASA refused him permission. The first CM to be given a call sign other than the mission designation would be that of Apollo 9, which carried a LM that would separate from it and then re-dock, necessitating distinct call signs for the two vehicles.

Launch vehicle

Since it flew in low Earth orbit and did not include a LM, Apollo   7 was launched with the Saturn IB booster rather than the much larger and more powerful Saturn V. That Saturn IB was designated SA-205, and was the fifth Saturn IB to be flown—the earlier ones did not carry crews into space. It differed from its predecessors in that stronger propellant lines to the augmented spark igniter in the J-2 engines had been installed, so as to prevent a repetition of the early shutdown that had occurred on the uncrewed Apollo 6 flight; postflight analysis had shown that the propellant lines to the J-2 engines, also used in the Saturn V tested on Apollo   6, had leaked.

The Saturn IB was a two-stage rocket, with the second stage an S-IVB similar to the third stage of the Saturn V, the rocket used by all later Apollo missions. The Saturn IB was used after the close of the Apollo Program to bring crews in Apollo CSMs to Skylab, and for the Apollo–Soyuz Test Project.

Apollo 7 was the only crewed Apollo mission to launch from Cape Kennedy Air Force Station's Launch Complex 34. All subsequent Apollo and Skylab spacecraft flights (including Apollo–Soyuz) were launched from Launch Complex 39 at the nearby Kennedy Space Center. Launch Complex 34 was declared redundant and decommissioned in 1969, making Apollo   7 the last human spaceflight mission to launch from the Cape Air Force Station in the 20th century.

Mission highlights
The main purposes of the Apollo   7 flight were to show that the Block II CM would be habitable and reliable over the length of time required for a lunar mission, to show that the service propulsion system (SPS, the spacecraft's main engine) and the CM's guidance systems could perform a rendezvous in orbit, and later make a precision reentry and splashdown. In addition, there were a number of specific objectives, including evaluating the communications systems and the accuracy of onboard systems such as the propellant tank gauges. Many of the activities aimed at gathering these data were scheduled for early in the mission, so that if the mission was terminated prematurely, they would already have been completed, allowing for fixes to be made prior to the next Apollo flight.

Launch and testing

Apollo 7, the first crewed American space flight in 22 months, launched from Launch Complex 34 at 11:02:45   am EDT (15:02:45    UTC) on Friday, October 11, 1968.

During the countdown, the wind was blowing in from the east. Launching under these weather conditions was in violation of safety rules, since in the event of a launch vehicle malfunction and abort, the CM might be blown back over land instead of making the usual water landing. Apollo   7 was equipped with the old Apollo    1-style crew couches, which provided less protection than later ones. Schirra later related that he felt the launch should have been scrubbed, but managers waived the rule and he yielded under pressure.

Liftoff proceeded flawlessly; the Saturn IB performed well on its first crewed launch and there were no significant anomalies during the boost phase. The astronauts described it as very smooth. The ascent made the 45-year-old Schirra the oldest person to that point to enter space, and, as it proved, the only astronaut to fly Mercury, Gemini and Apollo missions.

Within the first three hours of flight, the astronauts performed two actions which simulated what would be required on a lunar mission. First, they maneuvered the craft with the S-IVB still attached, as would be required for the burn that would take lunar missions to the Moon. Then, after separation from the S-IVB, Schirra turned the CSM around and approached a docking target painted on the S-IVB, simulating the docking maneuver with the lunar module on Moon-bound missions prior to extracting the combined craft. After station keeping with the S-IVB for 20 minutes, Schirra let it drift away, putting 76 mi between the CSM and it in preparation for the following day's rendezvous attempt.

The astronauts also enjoyed a hot lunch, the first hot meal prepared on an American spacecraft. Schirra had brought instant coffee along over the opposition of NASA doctors, who argued it added nothing nutritionally. Five hours after launch, he reported having, and enjoying, his first plastic bag full of coffee.

The purpose of the rendezvous was to demonstrate the CSM's ability to match orbits with and rescue a LM after an aborted lunar landing attempt, or following liftoff from the lunar surface. This was to occur on the second day; but by the end of the first, Schirra had reported he had a cold, and, despite Slayton coming on the loop to argue in favor, declined Mission Control's request that the crew power up and test the onboard television camera prior to the rendezvous, citing the cold, that the crew had not eaten, and that there was already a very full schedule.

The rendezvous was complicated by the fact that the Apollo   7 spacecraft lacked a rendezvous radar, something the Moon-bound missions would have. The SPS, the engine that would be needed to send later Apollo CSMs into and out of lunar orbit, had been fired only on a test stand. Although the astronauts were confident it would work, they were concerned it might fire in an unexpected manner, necessitating an early end to the mission. The burns would be computed from the ground but the final work in maneuvering up to the S-IVB would require Eisele to use the telescope and sextant to compute the final burns, with Schirra applying the ship's reaction control system (RCS) thrusters. Eisele was startled by the violent jolt caused by activating the SPS. The thrust caused Schirra to yell, "Yabba dabba doo!" in reference to The Flintstones cartoon. Schirra eased the craft close to the S-IVB, which was tumbling out of control, successfully completing the rendezvous.

The first television broadcast took place on October 14. It began with a view of a card reading "From the Lovely Apollo Room high atop everything", recalling tag lines used by band leaders on 1930s radio broadcasts. Cunningham served as camera operator with Eisele as emcee. During the seven-minute broadcast, the crew showed off the spacecraft and gave the audience views of the southern United States. Before the close, Schirra held another sign, "Keep those cards and letters coming in folks", another old-time radio tag line that had been used recently by Dean Martin. This was the first live television broadcast from an American spacecraft (Gordon Cooper had transmitted slow scan television pictures from Faith   7 in 1963, but the pictures were of poor quality and were never broadcast). According to Jones, "these apparently amiable astronauts delivered to NASA a solid public relations coup." Daily television broadcasts of about 10 minutes each followed, during which the crew held up more signs and educated their audience about spaceflight; after the return to Earth, they were awarded a special Emmy for the telecasts.

Later on October 14, the craft's onboard radar receiver was able to lock onto a ground-based transmitter, again showing a CSM in lunar orbit could keep contact with a LM returning from the Moon's surface. Throughout the remainder of the mission, the crew continued to run tests on the CSM, including of the propulsion, navigation, environmental, electrical and thermal control systems. All checked out well; according to authors Francis French and Colin Burgess, "The redesigned Apollo spacecraft was better than anyone had dared to hope." Eisele found that navigation was not as easy as anticipated; he found it difficult to use Earth's horizon in sighting stars due to the fuzziness of the atmosphere, and water dumps made it difficult to discern which glistening points were stars and which ice particles. By the end of the mission, the SPS engine had been fired eight times without any problems.

One difficulty that was encountered was with the sleep schedule, which called for one crew member to remain awake at all times; Eisele was to remain awake while the others slept, and sleep during part of the time the others were awake. This did not work well, as it was hard for crew members to work without making a disturbance. Cunningham later remembered waking up to find Eisele dozing.

Conflict and splashdown
Schirra was angered by NASA managers allowing the launch to proceed despite the winds, saying "The mission pushed us to the wall in terms of risk." Jones said, "This prelaunch dispute was the prelude to a tug of war over command decisions for the rest of the mission." Lack of sleep and Schirra's cold probably contributed to the conflict between the astronauts and Mission Control that surfaced from time to time during the flight.

The testing of the television resulted in a disagreement between the crew and Houston. Schirra stated at the time, "You've added two burns to this flight schedule, and you've added a urine water dump; and we have a new vehicle up here, and I can tell you at this point, TV will be delayed without any further discussion until after the rendezvous." Schirra later wrote, "we'd resist anything that interfered with our main mission objectives. On this particular Saturday morning a TV program clearly interfered." Eisele agreed in his memoirs, "We were preoccupied with preparations for that critical exercise and didn't want to divert our attention with what seemed to be trivialities at the time.   ... Evidently the earth people felt differently; there was a real stink about the hotheaded, recalcitrant Apollo    7 crew who wouldn't take orders." French and Burgess wrote, "When this point is considered objectively—that in a front-loaded mission the rendezvous, alignment, and engine tests should be done before television shows—it is hard to argue with him [Schirra]." Although Slayton gave in to Schirra, the commander's attitude surprised flight controllers.

On Day 8, after being asked to follow a new procedure passed up from the ground that caused the computer to freeze, Eisele radioed, "We didn't get the results that you were after. We didn't get a damn thing, in fact   ... you bet your ass    ... as far as we're concerned, somebody down there screwed up royally when he laid that one on us." Schirra later stated his belief that this was the one main occasion when Eisele upset Mission Control. The next day saw more conflict, with Schirra telling Mission Control after having to make repeated firings of the RCS system to keep the spacecraft stable during a test, "I wish you would find out the idiot's name who thought up this test. I want to find out, and I want to talk to him personally when I get back down." Eisele joined in, "While you are at it, find out who dreamed up 'P22 horizon test'; that is a beauty also."

A further source of tension between Mission Control and the crew was that Schirra repeatedly expressed the view that the reentry should be conducted with their helmets off. He perceived a risk that their eardrums might burst due to the sinus pressure from their colds, and they wanted to be able to pinch their noses and blow to equalize the pressure as it increased during reentry. This would have been impossible wearing the helmets. Over several days, Schirra refused advice from the ground that the helmets should be worn, stating it was his prerogative as commander to decide this, though Slayton warned him he would have to answer for it after the flight. Schirra stated in 1994, "In this case I had a cold, and I'd had enough discussion with the ground, and I didn't have much more time to talk about whether we would put the helmet on or off. I said, essentially, I'm on board, I'm commanding. They could wear all the black armbands they wanted if I was lost or if I lost my hearing. But I had the responsibility for getting through the mission." No helmets were worn during the entry. Director of Flight Operations Christopher C. Kraft demanded an explanation for what he believed was Schirra's insubordination from the CAPCOM, Stafford. Kraft later said, "Schirra was exercising his commander’s right to have the last word, and that was that."

Apollo 7 splashed down without incident at 11:11:48 UTC on October 22, 1968, 200 nmi SSW of Bermuda and 7 nmi north of the recovery ship USS Essex. The mission's duration was 10   days, 20    hours, 9    minutes and 3    seconds.

Assessment and aftermath
After the mission, NASA awarded Schirra, Eisele and Cunningham its Exceptional Service Medal in recognition of their success. On November 2, 1968, President Lyndon Johnson held a ceremony at the LBJ Ranch in Johnson City, Texas, to present the astronauts with the medals. He also presented NASA's highest honor, the Distinguished Service Medal, to recently retired NASA administrator James E. Webb, for his "outstanding leadership of America's space program" since the beginning of Apollo. Johnson also invited the crew to the White House, and they went there in December 1968.

Despite the difficulties between the crew and Mission Control, the mission successfully met its objectives to verify the Apollo command and service module's flightworthiness, allowing Apollo   8's flight to the Moon to proceed just two months later. John T. McQuiston wrote in The New York Times after Eisele's death in 1987 that Apollo   7's success brought renewed confidence to NASA's space program. According to Jones, "Three weeks after the Apollo   7 crew returned, NASA administrator Thomas Paine green-lighted Apollo    8 to launch in late December and orbit the Moon. Apollo    7 had delivered NASA from its trial by fire—it was the first small step down a path that would lead another crew, nine months later, to the Sea of Tranquility."

General Sam Phillips, the Apollo Program Manager, said at the time, "Apollo   7 goes into my book as a perfect mission. We accomplished 101 percent of our objectives." Kraft wrote, "Schirra and his crew did it all—or at least all of it that counted   ... [T]hey proved to everyone's satisfaction that the SPS engine was one of the most reliable we'd ever sent into space. They operated the Command and Service Modules with true professionalism." Eisele wrote, "We were insolent, high-handed, and Machiavellian at times. Call it paranoia, call it smart—it got the job done. We had a great flight." Kranz stated in 1998, "we all look back now with a longer perspective. Schirra really wasn't on us as bad as it seemed at the time.   ... Bottom line was, even with a grumpy commander, we got the job done as a team."

None of the Apollo 7 crew members flew in space again. According to Jim Lovell, "Apollo   7 was a very successful flight—they did an excellent job—but it was a very contentious flight. They all teed off the ground people quite considerably, and I think that kind of put a stop on future flights [for them]." Schirra had announced, before the flight, his retirement from NASA and the Navy, effective July 1, 1969. The other two crew members had their spaceflight careers stunted by their involvement in Apollo   7; by some accounts, Kraft told Slayton he was unwilling to work in future with any member of the crew. Cunningham heard the rumors that Kraft had said this and confronted him in early 1969; Kraft denied making the statement "but his reaction wasn't exactly outraged innocence." Eisele's career may also have been affected by becoming the first active astronaut to divorce, followed by a quick remarriage, and an indifferent performance as backup CMP for Apollo   10. He resigned from the Astronaut Office in 1970 though he remained with NASA at the Langley Research Center in Virginia until 1972, when he was eligible for retirement. Cunningham was made the leader of the Astronaut Office's Skylab division. He related that he was informally offered command of the first Skylab crew, but when this instead went to Apollo 12 commander Pete Conrad, with Cunningham offered the position of backup commander, he resigned as an astronaut in 1971.

Schirra, Eisele and Cunningham were the only crew, of all the Apollo, Skylab and Apollo–Soyuz missions, who had not been awarded the Distinguished Service Medal immediately following their missions (though Schirra had received the medal twice before, for his Mercury and Gemini missions). Therefore, NASA administrator Michael D. Griffin decided to belatedly award the medals to the crew in October 2008, "[f]or exemplary performance in meeting all the Apollo   7 mission objectives and more on the first crewed Apollo mission, paving the way for the first flight to the Moon on Apollo    8 and the first crewed lunar landing on Apollo    11." Only Cunningham was still alive at the time as Eisele had died in 1987 and Schirra in 2007. Eisele's widow accepted his medal, and Apollo 8 crew member Bill Anders accepted Schirra's. Other Apollo astronauts, including Neil Armstrong, Buzz Aldrin, and Alan Bean, were present at the award ceremony. Kraft, who had been in conflict with the crew during the mission, sent a conciliatory video message of congratulations, saying: "We gave you a hard time once but you certainly survived that and have done extremely well since   ... I am frankly, very proud to call you a friend."

Mission insignia

The insignia for the flight shows a command and service module with its SPS engine firing, the trail from that fire encircling a globe and extending past the edges of the patch symbolizing the Earth-orbital nature of the mission. The Roman numeral   VII appears in the South Pacific Ocean and the crew's names appear on a wide black arc at the bottom. The patch was designed by Allen Stevens of Rockwell International.

Spacecraft location
In January 1969, the Apollo   7 command module was displayed on the NASA float in the inauguration parade of President Richard M. Nixon. The Apollo   7 astronauts rode in an open car. After being transferred to the Smithsonian Institution in 1970, the spacecraft was loaned to the National Museum of Science and Technology, in Ottawa, Ontario. It was returned to the United States in 2004. Currently, the Apollo   7 CM is on loan to the Frontiers of Flight Museum at Love Field in Dallas, Texas.

Depiction in media

On November 6, 1968, comedian Bob Hope broadcast one of his variety television specials from NASA's Manned Spacecraft Center in Houston to honor the Apollo   7 crew. Barbara Eden, star of the popular comedy series I Dream of Jeannie, which featured fictional astronauts among its regular characters, appeared with Schirra, Eisele and Cunningham.

Schirra parlayed the head cold he contracted during Apollo   7 into a television advertising contract as a spokesman for Actifed, an over-the-counter version of the medicine he took in space.

The Apollo 7 mission is dramatized in the 1998 miniseries From the Earth to the Moon episode "We Have Cleared the Tower", with Mark Harmon as Schirra, John Mese as Eisele, Fredric Lehne as Cunningham and Nick Searcy as Slayton.

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title: Apollo 7