Question

What is DH?

(a) Distance Height

(b) Direct Height

(c) Decision Height

(d) Direction height

I had been asked this question during an interview.

My question is based upon ILS/MLS Coupled Landing System and Automatic Landing in division Autopilots and Flight Management Systems of Avionics

Answer 1

The correct answer is (c) Decision Height

To explain I would say: This minimum permitted ceiling for vertical visibility for the landing to proceed is known as the decision height or DH. A very high integrity autopilot system is required for fully automatic landing below a DH of 100 ft – Cat. III conditions.