View Full Version : Fail-operational, 737NG
KristianNorway
8th Jul 2011, 07:53
Hello chaps
I have a question specifically regarding the 737 fail-operational status.
Since we have only two autopilots, what makes the system triple redundant and hence fail-operational?
Cheers:ok:
DraggieDriver
8th Jul 2011, 09:53
http://www.pprune.org/tech-log/349148-b737-fail-operational.html
172_driver
8th Jul 2011, 10:12
Extract from CS-AWO:
(4) Fail-operational Automatic Landing System: An automatic landing system is fail-operational if, in the event of a failure, the approach, flare and landing can be completed by the remaining part of the automatic system. In the event of a failure, the automatic landing system will operate as a fail-passive system.
The following are typical arrangements:
(i) Two monitored automatic pilots, one remaining operative after a failure.
(ii) Three automatic pilots, two remaining operative (to permit comparison and provide necessary failure detection and protection) after a failure.
Apparently you can receive fail-operational status with two monitored autopilots. But what a monitored autopilot is, I'am clueless :confused: