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What are the four components of an ILS approach?

Localizer, Glideslope, Marker Beacons, Approach Control

Localizer, Glideslope, Outer Marker, Ground Control

Localizer, Glideslope, Approach Lighting, Runway Signs

Localizer, Glideslope, Outer Marker, Inner Marker

The four components of an Instrument Landing System (ILS) approach are the Localizer, Glideslope, Outer Marker, and Inner Marker.

The Localizer provides horizontal guidance by determining the aircraft's left or right position relative to the runway centerline, allowing it to maintain proper alignment for landing. The Glideslope offers vertical guidance, indicating the proper descent angle for the aircraft to follow as it approaches the runway.

Markers, specifically the Outer Marker and Inner Marker, serve to alert pilots about their distance from the runway. The Outer Marker typically indicates the point at which the aircraft should intercept the glideslope, whereas the Inner Marker signals when the aircraft is nearing the decision altitude, close to landing.

These components work together to ensure safe, precise landings, especially in low visibility conditions, by enabling pilots to rely on instrument guidance rather than visual cues.

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