apu on a 767
Hi,
By no means an expert on the 767 or any big iron for that matter (a mere PPL), still a quick question regarding the APU if I may...
initially you'll turn it on, start up the engines then turn it off.
What I'm not clear about is when should one turn it on again? (somehow 10K comes to mind, but I'm not sure where I got that number from)
Thanks!