28 () posted 3 years ago by Zap_Powerz 3 years ago by Zap_Powerz +29 / -1 23 comments share 23 comments share save hide report block hide replies
I've often wondered what the small tube opening on the tail of 737 and 767s are for.
Any pilots here want to comment?
Auxiliary Power Unit. Gas powered generator for getting the main turbines spun up and started, can also be used for emergency power.
Thank you sir!