OK .. now that most of the "sensible" stuff seems to have stopped I have a related question ....
I've noticed first wave dept. a/c having APU started up, heating/lighting on and then left with doors closed and no-one at all on board.
Engineers do the APU start/initiate and then move onto the next a/c. Can be 1hr before anyone returns.
OK no pax involved but are there any safety implications?