Instrument Landing System

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INSTRUMENT LANDING SYSTEM- A precision instrument approach system which normally consists of the following electronic components and visual aids:

a. Localizer.

(See LOCALIZER.)

b. Glideslope.

(See GLIDESLOPE.)

c. Outer Marker.

(See OUTER MARKER.)

d. Middle Marker.

(See MIDDLE MARKER.)

e. Approach Lights.

(See AIRPORT LIGHTING.)

(Refer to 14 CFR Part 91.)

(Refer to AIM.)

From the Pilot's Handbook of Aeronautical Knowledge:

Instrument landing system (ILS) - An electronic system that provides both horizontal and vertical guidance to a specific runway, used to execute a precision instrument approach procedure.