When I set the landing altitude manually, an amber LDG ALT and Landing Altitude EICAS message is displayed. There are no failures nor has the landing altitude been set incorrectly.
Why do I still get the EICAS message ALT LDG in amber?
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The Boeing 777 is a very automated aircraft. The takeoff altitude, landing altitude, and cabin pressurization altitude are all automatically set when you enter the departure airport and destination airport in the Flight Management Computer.
The EICAS message ALT LDG appears when the FMC is not controlling the landing altitude. This can be caused by one of three different conditions:
1) There is no destination airport entered in the FMC
2) The FMC landing altitude function has failed
3) The LDG ALT knob has been used to set the landing altitude manually
It is also normal to see ALT LDG after landing when the route has been dumped.