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This article is about the Moon mission. There is also a film by the name of Apollo 13.

Apollo 13 was an American space mission, part of the Apollo program. It was intended to be the third mission to land on the Moon, but instead is famous for the critical malfunction it suffered and its difficult but successful return home.

Crew

• James A. Lovell (flew on Gemini 7, Gemini 12, Apollo 8 & Apollo 13), commander
• Jack Swigert (flew on Apollo 13), command module pilot
• Fred Haise (flew on Apollo 13), lunar module pilot
• Ken Mattingly was originally slated to be command module pilot, but he was removed from the flight three days before launch after being exposed to German Measles. He later flew as command module pilot on Apollo 16.

Backup crew

• John Young, commander
• Jack Swigert, command module pilot
• Charles Duke, lunar module pilot

Support crew

• Vance Brand (flew on Apollo-Soyuz, STS-5, STS-41-B, and STS-51)
• Jack Lousma (flew on Skylab 3 and STS-3)
• Bill Pogue (flew on Skylab 4)
• Joe Kerwin (flew on Skylab 2)

Mission parameters

• Mass: CM 28,945 kg; LM 15,235 kg
• Perigee: 181.5 km
• Apogee: 185.6 km
• Inclination: 33.5°
• Period: 88.07 min

Oxygen tank explosion

• April 14, 1970, 03:08:53.555 UTC
  • 321,860 km from earth.

Closest approach to Moon

• April 15, 1970, 00:21:00 UTC
  • 254.3 km above far side of Moon;
  • 400,171 km from Earth (possibly a record distance, see below).

See also

• Splashdown
• List of artificial objects on the Moon

Quote

Famous misquote: "Houston, we have a problem"
Actual quote: "Okay, Houston, we've had a problem here" [1], uttered by Swigert to ground. Lovell then uttered this similar phrase: "Houston, we've had a problem."

Mission highlights

The Apollo 13 mission began with a lesser known malfunction which could have been equally catastrophic. During second stage burn the center engine shut down prematurely. Engineers later discovered that this was due to dangerous pogo oscillations which might have torn the second stage apart; the engine was experiencing 68g vibrations at 16 hertz, flexing the thrust frame by 3 inches. Luckily the oscillations caused a low pressure reading to register, and the computer shut the engine down automatically. This was later traced to amplification of the pogo that had occurred on previous flights by an unexpected interaction with the cavitation in the turbopumps. Later missions had anti-pogo devices as had already been planned since before Apollo 13 which solved the problem.

When Apollo 13 was 321,860 kilometers (199,990 mi) from Earth, an oxygen tank in the service module exploded. The only solution was for the crew to cancel their planned landing, swing around the Moon and return on a trajectory back to Earth. However, because their command/service module "Odyssey" was severely damaged, the three astronauts had to use the lunar module "Aquarius" as a crowded lifeboat for the return home. The four-day return trip was cold, uncomfortable, and tense. But Apollo 13 proved the program's ability to weather a major crisis and bring the crew back home safely.

Problem

As the spacecraft was on its way to the Moon, the number two oxygen tank in the Service Module (SM) exploded when Mission Control requested that the crew perform a "cryo stir", in which the oxygen "slush" is stirred to prevent it from stratifying. Damaged electrical wires powering the stirrer motor caught fire when power was applied. The fire caused a pressure increase above the tank's nominal 1,000 lbf/in² (7 MPa), and the tank exploded. This explosion damaged other parts of the service module, including the number 1 oxygen tank. At the time of the explosion, however, the true cause was not known; one conjecture was a meteoroid impact. The loss of both oxygen tanks in the service module and thus the oxygen required to create electrical power for the Command/Service Modules (CSM) meant that the CSM had to be completely shut down. The Command Module (CM) contained batteries for use during re-entry, after the Service Module was jettisoned, but these would only last about ten hours, and needed to be saved for re-entry. The crew survived by using the Lunar Module (LM, still attached to the CM) as a "lifeboat".

The damage to the CSM meant that the Moon-landing mission (originally intended to land at the Fra Mauro Highlands) had to be aborted; a single pass around the Moon was made and the spacecraft returned to Earth. Considerable ingenuity under extreme pressure was required from both the crew and the flight controllers to figure out how to jury rig the craft for the crew's safe return, with much of the world watching the drama on television. One of the major stumbling blocks in this was that the LM "lifeboat" was equipped to sustain two people for two days, and it would now have to sustain three people for four days. One of the most critical problems was that the lithium hydroxide carbon dioxide filters in the LM would not last for all four days, and the CM's spare filters were the wrong shape for the LM's filter receptacle; an adapter had to be fabricated from materials in the spacecraft.

To accomplish a safe return to Earth, a significant course correction to place the spacecraft on a free return trajectory was required. This would normally be a simple procedure using the service module propulsion engine. However, the flight controllers did not know the extent of the damage the service module had suffered and did not want to risk firing the main engine. Instead, the course correction would have to be performed by firing the lunar module's descent engine. After extensive discussion, engineers on the ground found it was possible. The initial maneuver to change to a free return trajectory was made within hours of the accident. The descent engine was fired again after passage around the Moon in order to accelerate the spacecraft's return to Earth, and later for a minor course correction.

As re-entry to Earth's atmosphere approached, NASA took the unusual step of jettisoning the Service Module first, while the Lunar Module was still attached to the Command Module. The LM thrusters were used to maneuver the CM/LM stack to point its windows at the departing SM, and photos were taken. When the crew saw the damaged service module, they reported that the access panel covering the O₂ tanks and fuel cells had been blown off.

There was some fear that the extensive condensation in the CM, due to reduced temperatures during the return leg, might have seriously damaged the electronics of the Command Module, which would become apparent upon activation. But the equipment worked perfectly when activated, at least partly due to the extensive design modifications made to the CM after the Apollo 1 fire.

The crew returned unharmed to Earth, although Haise had a urinary tract infection resulting from the scarcity of potable water on the damaged ship and the difficulty of disposing of urine, and had to be treated in an infirmary.

While the crew was unfortunate to have this kind of major malfunction, they were still extremely lucky that it occurred on the first leg of the mission when they had a maximum of supplies, equipment, and power to use in the emergency. If the explosion had occurred while in orbit around the moon, or on the return leg after the LM had been jettisoned, the crew probably would not have survived.

After the completion of the mission, there was a full investigation of the incident and the craft was modified to prevent future occurrences of the fault.

Jim Lovell and Jeffrey Kluger's book about the mission, Lost Moon, was later turned into a successful movie, Apollo 13, starring Tom Hanks, Bill Paxton and Kevin Bacon as the Apollo crewmen.

Cause of the accident

The explosion on Apollo 13 led to a lengthy investigation of the underlying cause. Thanks to detailed manufacturing records and logs of mission problems, the failure of the faulty oxygen tank was tracked to multiple faults that were not problems individually, but nearly led to disaster on this mission.

Liquid gases are very difficult to handle, and most storage containers holding them are unsealed so that pressure from expanding gas will not cause the container to fail (much like freezing water in even the strongest sealed container will shatter it). Apollo's liquid oxygen tank was a marvel of engineering, able to hold several hundred pounds of highly pressurized liquid gas to supply the craft with oxygen, fuel for electricity (along with hydrogen) and water from the by-product of the fuel cells. Left alone, the tank was capable of safely holding liquid oxygen under high pressure for years before it evaporated because of its design and insulation. Unfortunately, the very characteristic that made the tank useful made internal inspection impossible.

The tank was made of several basic components that were relevant to the accident:

• A thermostat to control the heater within the tank that sped the evaporation of the liquid into gaseous oxygen;
• A thermometer to determine the temperature of the heater;
• Valves and piping that were designed to allow the tank to be completely emptied of liquid by forcing gas into the tank;
• An interior coating of teflon that protected the wiring from the extremely cold gas; and
• An internal fan to stir the liquid oxygen (liquid oxygen will turn into a "slush" at these pressures if it is allowed to sit for a long period of time).

These were the basic design, manufacturing and operational problems that led to the accident.

• The thermostat was originally designed to handle the 28 volt supply that would be used in the command module. However, the specification for the tank was changed so that it had to handle 65 volts on the launch pad. Most of the wiring was changed to handle the higher voltage, but the thermostat was not.
• The thermometer was designed to read out at the highest operational temperature of the heater, about 100 degrees Fahrenheit. Higher temperatures registered at 100 °F, but the thermostat was supposed to cut out at 80 °F (27 °C), making higher temperatures impossible.
• During assembly, the structure carrying the tank that failed was dropped about 2 inches (5 cm). The exterior was undamaged, but the pipes that directed flow within the tank became misaligned.
• For ground testing the tank was filled. However, when it came time to empty it, the problem with the piping was discovered. As such, the tank could not be properly emptied except by running the heater to evaporate the liquid gas. Not using this tank would have delayed the mission and there was no alternative tank available. Lovell was aware of the decision to use the heater to evaporate the oxygen, which was calculated to take a few days at the highest operational temperature of 80 °F (27 °C).
• However, when the heater was turned on continuously, the higher voltage fused the thermostat, which allowed the heater to keep heating up. Because the thermometer did not register temperatures higher than 100 degrees Fahrenheit (38 degrees Celsius), the monitoring equipment did not pick this up. The current recorder in the power supply showed that the heater was not cycling on and off, but no-one noticed it at the time. Instead of taking several days, the gas evaporated in hours, and the interior of the tank kept heating up, reaching an estimated 800 degrees Fahrenheit (430 °C). This burned off the teflon coating, leaving the wires inside the tank exposed.
• The rest was inevitable. When the tank was refilled with oxygen, it became a bomb waiting to go off. The order to run the "cryo stir" to run the fans set off sparks inside the tank which led to the explosion.
• However disaster could have been averted, except that both oxygen tanks were adjacent. Although the second tank survived the explosion, its valves were damaged which allowed the oxygen within to leak out. In future Apollo missions, the two oxygen tanks were separately located.

Mission notes

• There was no time to properly replace the original lunar plaque on Aquarius (which bore Mattingly's name), so Jim Lovell was given a replacement (with Swigert's name) to place over the original plaque once they landed on the moon. However, because the lunar landing was never made, Lovell kept the plaque, which is one of the few mementos from the mission that he has on display at his home.

• As a result of following the free return trajectory, the altitude of Apollo 13 over the lunar far side was approximately 100 km greater than the corresponding orbital altitude on the remaining Apollo lunar missions. This could mean an all-time altitude record for human spaceflight—not even superseded as of 2006—but this may well not be the case: the variation in distance between Earth and the Moon owing to the eccentricity of the Moon's orbit about Earth is much larger than this 100 km. The Guinness Book of Records did list this flight as having the absolute altitude record for a manned spacecraft, but if this is so, then Lovell should have received a certificate from them attesting to this record (Lovell stated in the book Lost Moon that apart from the plaque and a couple of other pieces of salvage, the only other item he has regarding this mission was a letter from Charles Lindbergh).

• The splashdown point was 21°38′S 165°22′W, SE of American Samoa and 6.5 km (4 mi) from the recovery ship, USS Iwo Jima.

• Superstitious people have often associated the belief that 13 is an unlucky number to the mission, especially due to the fact that the mission began at 13:13 CST, the problems began on April 13, and the mission is called Apollo 13.

Insignia

The Apollo 13 logo featured three flying horses, and the motto Ex luna, scientia (from the Moon, knowledge), and the number of the mission in Roman numerals. It is one of two Apollo insignias (the other being Apollo 11's) not to include the names of the crew (which was fortunate, considering one of the original crew was replaced not long before the mission began).

Relics

The command module is currently displayed at the Kansas Cosmosphere and Space Center, Hutchinson, Kansas. It was formerly at the Musée de l'Air et de l'Espace, Paris. The lunar module burned up in Earth's atmosphere 17 April 1970, having been targeted to enter over the Pacific Ocean to reduce the possibility of contamination from a radioisotope thermoelectric generator (RTG) on board (had the mission proceeded as planned, the RTG would have been used to power the Apollo Lunar Surface Experiment Package, and then remained on the Moon). The RTG survived reentry (as designed) and landed in the Tonga Trench. While it will remain radioactive for approximately 2000 years, it does not appear to be releasing radioactive material.

Dramatization

• Apollo 13 - the 1995 film directed by Ron Howard and starring, as the astronauts, Tom Hanks, Bill Paxton, and Kevin Bacon, with Ed Harris as flight director Gene Kranz, Kathleen Quinlan, and Gary Sinise in supporting roles. The film was based on Lost Moon, Jim Lovell's book about the incident.
• In the 1993 film Falling Down, Michael Douglas' character compares himself to the crew of Apollo 13, claiming that he had passed the "point of no return" as they had, thus causing them to circle the moon.

Games

• Apollo 13 Solarquest was a 1995 board game released by Universal Games. It was based on the popular 1986 "space-age" Monopoly variant, Solarquest.
• Sega produced an Apollo 13 pinball machine, featuring a 13-ball multiball.
• Apollo 13 - an ITSM case experience is a simulation game used in ITIL training. It's made by Dutch company GamingWorks BV.

External links

• Apollo 13 entry in Encyclopedia Astronautica

Reference

• NASA NSSDC Master Catalog
• APOLLO BY THE NUMBERS: A Statistical Reference by Richard W. Orloff (NASA)
• The Apollo Spacecraft: A Chronology
• Apollo Program Summary Report
• Apollo 13 Characteristics - SP-4012 NASA HISTORICAL DATA BOOK
• Original Apollo 13 Lunar Exploration and Photography Summary Plan (PDF), February 1970
• Apollo 13 Spacecraft Incident Investigation, (PDF) NASA June 1970
• Report of Apollo 13 Review Board, (PDF) NASA June 1970
• Apollo 13 Technical Air-to-Ground Voice Transcription, April 1970, 765 pages (PDF, 20.4 MB)
• Apollo 13, We Have a Solution: Rather than hurried improvisation, saving the crew of Apollo 13 took years of preparation
• Lovell, Jim; Kluger, Jeffrey (1994). Lost Moon: The Perilous Voyage of Apollo 13. Houghton Mifflin. ISBN 0395670292.
• NASA film on the Apollo 13 mission downloadable from archive.org The Internet Archive

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