Originally Posted by
Aviator147
idk, "MAY NOT", sounds pretty restrictive and definitive and isn't up for interpretation IMO...
if theres no more fuel coming onto the a/c and the fuel panel is still open then I'd crank it.
But then why in the AOM the next sentence say 'DO NOT' during APU failed to start or it shuts off itself? Why not just make it an any scenario 'a no matter what happen thing'.
Check below, only the word MUST means mandatory.
https://www.faa.gov/about/initiative...les/mandatory/