Question

What are the two main components of an ILS on the ground?

(a) Horizontal alignment transmitter and vertical alignment transmitter

(b) Localizer transmitter and glide slope transmitter

(c) Center line transmitter and glide slope transmitter

(d) Center line transmitter and approach slope transmitter

The question was posed to me during an interview.

This is a very interesting question from ILS/MLS Coupled Landing System and Automatic Landing in portion Autopilots and Flight Management Systems of Avionics

Answer 1

The correct answer is (b) Localizer transmitter and glide slope transmitter

Explanation: ILS system basically comprises a localiser transmitter and a glide slope transmitter located by the airport runway together with two or three radio marker beacons located at set distances along the approach to the runway. The airborne equipment in the aircraft comprises receivers and antennas for the localiser, glide slope and marker transmissions.