APU's work on the ground and in the air. APU's need to be started and shut down manually. When an engine fails, one of the first things in the Engine Failure Checklist is start the APU.
Yes everyone knows it's turned off in flight.and it has to be turned on when needed. Not sure what your going about. But it's bedtime. Six to eight. I'll follow up.
Because the APU has a “squat switch” that deactivates the APU in the air.
APU's work on the ground and in the air. APU's need to be started and shut down manually. When an engine fails, one of the first things in the Engine Failure Checklist is start the APU.
I worked on aircraft for 22 years. Every one had a squat switch that kept the APU from starting once the aircraft left the ground.
Yes everyone knows it's turned off in flight.and it has to be turned on when needed. Not sure what your going about. But it's bedtime. Six to eight. I'll follow up.