decision altitude (DA)/decision height
- decision altitude (DA)/decision height
i. A specified altitude or height in the precision approach at which a missed approach must be initiated if the required visual reference to continue the approach has not been established. The decision altitude is with reference to mean sea level, whereas the decision height is with reference to the threshold elevation. The required visual reference means that section of the visual aids or of the approach area that should have been in view for a sufficient time for the pilot to be able to assess the aircraft’s position and change of position in relation to the desired flight path. In Category III operations, with a decision height the required visual reference is that specified for the particular procedure and operation. For convenience, where both expressions are used they may be written in the form of “decision altitude/height” and abbreviated “DA/H.” These terms replace minimum height (MH), minimum descent (MD), minimum descent altitude/height [MDA (H)], and minimum descent height (MDH).
ii. The height at which a decision must be made, during an ILS (instrument landing system) or PAR (precision approach radar) instrument approach, either to continue the approach or to execute a missed approach.
Aviation dictionary.
2014.
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Decision Height — DA Unter Entscheidungshöhe versteht man in der Luftfahrt die Höhe über der Schwelle der jeweiligen Landebahn, bei der die Cockpitbesatzung eines anfliegenden Luftfahrzeugs entscheidet, ob der Landeanflug fortgesetzt und mit einer Landung beendet… … Deutsch Wikipedia
decision height — A height above the highest elevation in the touchdown zone, specified for a glide slope approach, at which a missed approach procedure must be initiated if the required visual reference has not been established. See also decision altitude … Military dictionary
decision altitude — An altitude related to the highest elevation in the touchdown zone, specified for a glide slope approach, at which a missed approach procedure must be initiated if the required visual reference has not been established. See also decision height … Military dictionary
height above touchdown — The decision height or minimum descent altitude above the highest runway elevation in the touchdown zone (i.e., the first 3000 ft of the runway). The HAT is published on instrument approach charts in conjunction with all straight in minimums.… … Aviation dictionary
Minimum Descent Altitude — MDA Die Mindestsinkflughöhe (englisch minimum descent altitude, MDA oder minimum descent height, MDH) ist die minimale Flughöhe, die bei einem Landeanflug in Form des Instrumentenanflugs ohne vertikale Führung (englisch non precision approach,… … Deutsch Wikipedia
critical altitude — i. A specified altitude or height in the precision approach at which a missed approach must be initiated if the required visual reference to continue the approach has not been established. Decision altitude is with reference to mean sea level,… … Aviation dictionary
break-off height/altitude — The minimum height below which an approach cannot be continued unless visual reference clues have been established. See also decision altitude/height … Aviation dictionary
Instrument approach — Terminal procedures for an ILS approach in the United States. (The disclaimers shown in red in the illustration do not appear on the original approach plate.) For aircraft operating under instrument flight rules (IFR), an instrument approach or… … Wikipedia
Instrument landing system — The Instrument Landing System (ILS) is a ground based instrument approach system that provides precision guidance to an aircraft approaching a runway, using a combination of radio signals and, in many cases, high intensity lighting arrays to… … Wikipedia
2010 Polish Air Force Tu-154 crash — Polish Air Force Tu 154 crash Part of the fuselage near Smolensk Accident summary Date 10 April … Wikipedia
