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TIL the space shuttle APUs were hydrazine gas turbines
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@nyanotech I read this as "arithmetic processing units" on my first try and wow, that would be so much better
@nyanotech This is also the F16 APU! Kind of a pita for ground crews tbh.
@nyanotech also they caught fire! more than they were supposed to at least
Right before landing, two of the orbiter's three auxiliary power units (APUs) caught fire due to a hydrazine leak, but the orbiter nonetheless landed successfully. Columbia was ferried back to KSC on 15 December 1983. The leak was later discovered after it had burned itself out and caused major damage to the compartment.