![]() ![]() Ground tests before launch indicated the possibility of a poorly insulated supercritical helium tank in the lunar module, or LM, descent stage, so the flight plan was modified to enter the LM three hours early in order to obtain an onboard readout of helium tank pressure. Command Module Pilot Ken Mattingly had no immunity to measles and was replaced by backup command module pilot, John “Jack” Swigert. This caused the remaining four engines to burn 34 seconds longer than planned, and the S-IVB third stage had to burn nine seconds longer to put Apollo 13 in orbit.ĭays before the mission, backup lunar module pilot, Charles Duke, inadvertently exposed the crew to German measles. Then the center engine of the S-II stage shut down two minutes early. ![]() At 5 1/2 minutes after liftoff, John “Jack” Swigert, Fred Haise and James Lovell felt a little vibration. ![]()
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