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Radio beacons: Difference between revisions
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→Marker beacons: decision height
m (→VOR) |
(→Marker beacons: decision height) |
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<!-- fix on NDB? Yes, look at Central Russia. Many fixes and no VOR stations nearby. --> | <!-- fix on NDB? Yes, look at Central Russia. Many fixes and no VOR stations nearby. --> | ||
==Marker beacons== | ==Marker beacons== | ||
Runways used to have three vertical directed radio beacons in-line with the runway to aid landing, the [http://en.wikipedia.org/wiki/Marker_beacon marker beacons]. | Runways used to have three vertical directed radio beacons in-line with the runway to aid landing, the [http://en.wikipedia.org/wiki/Marker_beacon marker beacons]. It was often combined with the [[ILS]] | ||
# Outer marker - Typically placed at 4 NM from runway | # Outer marker - Typically placed at 4 NM from runway | ||
# Middle marker - Typically placed at 3500 feet from the runway | # Middle marker - Typically placed at 3500 feet from the runway | ||
# Inner marker - Typically placed at 1000 feet from runway | # Inner marker - Typically placed at 1000 feet from runway. The aircraft should be at decision altitude/height and the pilot should perform the missed approach procedure if the runway is not visible. | ||
Distance from runway varies a lot. On many airfields the markers have been replaced with an [[ILS]] and/or [[VOR-DME]]. The outer marker is sometimes combined with a [[NDB]]. | Distance from runway varies a lot. On many airfields the markers have been replaced with an [[ILS]] and/or [[VOR-DME]]. The outer marker is sometimes combined with a [[NDB]]. | ||