Apollo 13 (April 11-17, 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) failed two days into the mission. The crew instead looped around the Moon 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.
- Lousma: 13, we've got one more item for you, when you get a chance. We'd like you to stir up your cryo tanks. In addition, I have shaft and trunnion – –
Lousma: – – for looking at the Comet Bennett, if you need it.
Swigert: Okay. Stand by.
[two minutes of silence]
Swigert: Okay, Houston, we've had a problem here.
Lousma: This is Houston. Say again, please.
Lovell: Uh, Houston, we've had a problem. We've had a MAIN B BUS UNDERVOLT.
Lousma: Roger. MAIN B UNDERVOLT.
Lousma: Okay, stand by, 13. We're looking at it.