I had just completed a flight and started the APU before engine shut down. Got APU generators and bleed air on. Shut sown the engines and then proceeded to turn everything off. Shut down the APU,EGT went down to off temps and turned off the battery. It sounded like the APU was still running and from an external rear view it definitely sounded like the sound had not shut down. Don't know if this was something I didn't get shut off or was a glitch of some kind. Tom Hibben

The sounds get glitchy sometimes with view switches. Try pressing 'q' twice after you switch views and see if it's still an issue. -stefan

Indeed ! Dam FSX Sound bug !!! As Stefan suggested - press "Q" twice to reset the FSX sounds when changing views.

Doesn't it also run for another minute or two to cool down?

Kyle - indeed it could be the APU taking its time to shut down as well.

i use P on the keyboard that always works for me. cheers