Question

An aircraft directly above the DME station at 1 nautical mile altitude would show ___________ on the DME readout.

(a) 100 nautical mile

(b) 10 nautical mile

(c) 0 nautical mile

(d) 1.0 nautical mile

I had been asked this question by my college director while I was bunking the class.

My enquiry is from Aviation Communication Systems in portion Aviation Communication Systems of Aircraft Maintenance

Answer 1

Correct answer is (d) 1.0 nautical mile

To explain: An aircraft directly above the DME station at 1 nautical mile altitude would show, 1.0 nautical mile on the DME readout. This indicates the aircraft is technically a mile away, just a mile straight up.