Launch from Cape Canaveral (KSC
landing on Edwards AFB
The launch occurred after a 1-month delay
because of technical reasons. Ulf
was the first non-American in a Space Shuttle. STS-9
carried the first crew of six persons and became the first mission of the
sponsored Spacelab (Spacelab 1, SL-1).
All in all 73 experiments were
carried out in the fields of atmospheric and plasma physics, astronomy, solar
physics, material sciences, technology, life sciences and Earth observations.
The effort went so well that the mission was extended an additional day to 10
days, making it the longest duration Shuttle flight to that date.
time before reentry two guidance computer crashed, but one of them was
succesfully rebooted. Just before landing two of the three auxiliary power
units (APU's) caught fire due to a hydrazine leak, but the landing was
succesful. The leak was later discovered after it burned itself out and caused
major damage to the compartment.