Question

At what height is the auto flare initiated?

(a) 100 ft

(b) 50 ft

(c) 25 ft

(d) 10 ft

The question was asked during a job interview.

My question is from ILS/MLS Coupled Landing System and Automatic Landing in portion Autopilots and Flight Management Systems of Avionics

Answer 1

Correct choice is (b) 50 ft

To explain: The auto flare is initiated around 50 ft where the aircraft is over or very near the runway threshold so that the radio altimeter is measuring the height of the aircraft above the runway. Low range radio altimeters are used to ensure accuracy.