That’s how airplanes are designed. It’s a pretty crucial part of the overall system for the airplane on the ground.
It would be like removing a car’s alternator…only much more complicated.
Where can I find information on this?
More dry reading - search for TSO C77b
https://drs.faa.gov/search?modalOpened=true
It's the FAA regulation that describes the data required to certify an APU. I'm still looking for released configuration description documents that will give more systems details....
Pages 18 - 23 here: https://vdocuments.net/b777-quick-reference.html?page=19
Bleed air system impacts: https://vdocuments.net/b777-air-systems.html (pages 10 and 23)
General systems: https://vdocuments.net/b777-systems-and-expanded-qrh.html (Page 47)
http://www.b737.org.uk/apu.htm
here's a description for a 737. all the same principles will apply here. Fair warning....it's a bit dry.
(post is archived)