Originally Posted by
Tu.114
other seem to abhor anything audible and running the APU outside their stipulated timeframe after on-block and before off-block may even carry a fine. Those fields, however, normally offer a ground-based air conditioning unit of rather variable quality.
If on such a field, the ground-based AC is inop or unsatisfactory, there usually are ways to quickly obtain a tactical dispense from the rule and be allowed to use the on-board systems.
What happens at one of these airports if no one answers the radio (or whatever the procedure is) and you turn on the APU... company gets a nastygram on your behalf some time later?