Question

The localizer provides course guidance through the descent path to the runway threshold from a distance of __________NM.

A) 5
B) 10
C) 15
D) 20

Answer 1

The localizer provides lateral guidance to aircraft and is designed to be reliable up to a distance of 18 to 20 NM from the localizer antenna for aircraft equipped with ILS equipment.

Step-by-step explanation:

The localizer is a component of an Instrument Landing System (ILS), which provides lateral guidance to aircraft during the approach phase of landing. When an aircraft is equipped with ILS equipment and is attempting to land on a runway equipped with an ILS system, the localizer provides course guidance to align the aircraft with the centerline of the runway. The correct answer to the question is:

D) 20

The localizer signal is designed to be reliable up to a distance of 18 to 20 NM (nautical miles) from the antenna, depending on the conditions. However, the effective range depends on several factors including the altitude of the aircraft, the terrain between the aircraft and the localizer antenna, and the sensitivity of the aircraft's receiving equipment.