Quote:
None of the three channels generating NO LAND 3 logic.
Jetdoc... Why would they put in the line "• Triple channel arm - all three channels either engaged or armed." if
"No Land 3 logic" could simply be a fault in any of the channels at any height.
I'm not quite sure what you are getting at here. At or below 1500ft RA with the APP sw pressed, LOC and GS CAP, the 3 FCCs bite check themselves and if all is ok, there will be a bus isolation request. I can't say much more. I have been away from the airplane for a long time and don't have anyone here to discuss this with.
Perhaps a B757 pilot could comment on this and also the VHF power interuption with the APP pressed. If you are out on the flight line, maybe you could talk to some of the pilots and see if they can do some checking on these things for you.
misd-agin
I think I highlighted the reason for the C A/P being used in post #20.