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instrument landing system |
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instrument landing system (ILS)Landing aid for aircraft that uses radio beacons on the ground and instruments on the flight deck. One beacon (localizer) sends out a vertical radio beam along the centre line of the runway. Another beacon (glide slope) transmits a beam in the plane at right angles to the localizer beam at the ideal approach-path angle. The pilot can tell from the instruments how to manoeuvre to attain the correct approach path. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The pilot then adds power as necessary to maintain glideslope position as indicated on the tower's optical landing system. It can simulate Localizer and Glideslope (CAT I, II and III) signals with variable Difference in Depth of Modulation (DDM) settings. The lens, although it has different waveoff and cut light locations, has the same number and color of glideslope cells and datum lights and is set to a standard 3. |
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