ATPL EASA Radio Navigation Practice Exam 2025 - Free Radio Navigation Practice Questions and Study Guide

The primary function of an Instrument Landing System (ILS) is to assist in the approach and landing phases of flight. This system provides precise lateral and vertical guidance to aircraft as they approach a runway for landing. The ILS consists of two main components: the localizer, which provides directional guidance along the runway centerline, and the glideslope, which offers vertical guidance to ensure the aircraft descends at the correct angle.

This precision is critical, especially in poor visibility conditions, allowing pilots to safely land their aircraft by following the indicated guidance. The system is widely used in commercial aviation and is a standard approach aid in many airports around the world.

Other functions, like providing weather data or measuring aircraft speed, are performed by different systems in the aircraft, such as radar or airspeed indicators. While takeoff can involve advanced navigation systems, it is not the primary function of the ILS, which is specifically designed for approach and landing.