Sorry for continuing the thread drift but the APU running inflight has me baffeld. I have about 7000 hours in the airplane and for some reans I cannot ever recall running the APU inflight. What am I missing??
The only way that the APU can run in flight on a 727, is if the FE forgets to turn it off prior to takeoff. Then the only way to shut it down, is to pull the APU fire handle. I had it happen to me twice, when the FE forgot to shut it down.
Sorry for the confusion.