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Radio Altimeter
Also from: RA
There are 2 RAs, both powered by AC, and active from lift off to touchdown. Displayed on the respective PFD when the aircraft is below 2,500'. The height is from the bottom of the wheels to the ground. Auto callouts are made at pre-determined heights.
Failures
| NAV RA 1(2) FAULT | - CAT 2 only will be available |
| NAV RA 1+2 FAULT | - GPWS must be switched off |