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What is DH?(a) Distance Height(b) Direct Height(c) Decision Height(d) Direction heightI 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»

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.



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