The radio altimeter is required to indicate zero height AGL as the main wheels touch down on the runway. For this reason, it is necessary to:
Domanda 36, Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot license
| Have a specific radio altimeter dedicated to automatic landing. |
| Adjust the gross height according to the aircraft instantaneous pitch. |
| Compensate for residual height and cable length. |
| Change the display scale in short final, in order to have a precise readout. |
