B737NG Autoland Fail Operation and Fail Passive
Thread Starter
B737NG Autoland Fail Operation and Fail Passive
Fail operation system can continue autoland even with one autopilot failure
But B737 only have 2 autopilot available - A/P A and A/P B
how is it consider as fail operation if one A/P failed ?
Thank you guys, your input will be highly appreciated
But B737 only have 2 autopilot available - A/P A and A/P B
how is it consider as fail operation if one A/P failed ?
Thank you guys, your input will be highly appreciated
I don't know the 737 flight control systems but the answer will be in AC 120-28 - https://www.faa.gov/documentLibrary/.../AC120-28D.pdf
Edit to add - The fact that, below alert height, a IIIb autoland approach can continue with a system failure does not mean that the autoland system is "fail operational" with that system failure.
Last edited by EXDAC; 25th May 2024 at 15:05.
Most airbusses and the 737 can be fail operational with just 2 autopilots. But most airlines do not spec the fail operational autopilot system on the 737 (no idea if its standard on the MAX, on the NG it is a customer option). In my previous airline we had all deliveries beginning from 2006 configured as fail operational. The fail operational system doesn't require nor need a HUD, but it requires a rudder servo for the autopilot system to be able to handle the 25kts crosswind limit in autoland. It also allows single engine flaps 30 autoland, depending on the required go around performance (performance calculation helps to figure that out).