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Apollo 13 Houston, We Have A Problem.

567 words - 2 pages

Apollo 13 (AS-508)Houston, we have a problem.The Apollo 13 mission was launched at 2:13 p.m. EST, April 11, 1970 from launchcomplex 39A at Kennedy Space Center. The space vehicle crew consisted of James A. Lovell, Jr.commander, John L. Swigert, Jr., command module pilot and Fred W.Haise, Jr. lunar module pilot.The Apollo 13 Mission was planned as a lunar landing mission butwas aborted en route to the moon after about 56 hours of flight due to lossof service module cryogenic oxygen and consequent loss of capability togenerate electrical power, to provide oxygen and to produce water.Spacecraft systems performance was nominal until the fans in cryogenic oxygen tank 2 wereturned on at 55:53:18 ground elapsed time (GET). About 2 seconds after energizing the fan circuit,a short was indicated in the current from fuel cell 3, which was supplying power to cryogenicoxygen tank 2 fans. Within several additional seconds, two other shorted conditions occurred.Electrical shorts in the fan circuit ignited the wire insulation, causing temperature andpressure to increase within cryogenic oxygen tank 2. When pressure reached the cryogenicoxygen tank 2 relief valve full-flow conditions of 1008 psi, the pressure began decreasingfor about 9 seconds, at which time the relief valve probably reseated, causing the pressureto rise again momentarily. About a quarter of a second later, a vibration disturbance wasnoted on the command module accelerometers.The next series of events occurred within a fraction of a second between theaccelerometer disturbances and the data loss. A tank line burst, because of heat, in thevacuum jacket pressurizing the annulus and, in turn, causing the blow-out plug on thevacuum jacket to rupture. Some mechanism in bay 4...

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