decision altitude

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Instrument approach
An instrument approach or instrument approach procedure (IAP) is a type of air navigation that allows pilots to land an aircraft in reduced visibility (known as instrument meteorological conditions or IMC), or to reach visual conditions permitting a normal landing.Approaches are classified as either precision or nonprecision, depending on the accuracy and capabilities of the navigational aids (navaids) used. Precision approaches utilize both lateral (course) and vertical (glideslope) information. Nonprecision approaches provide lateral course information only.
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NATO AAP6 (2004) DictionaryDownload this 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. 1/8/76
 
altitude de décision
Altitude, par rapport à l'altitude du point le plus élevé de la zone de posé, spécifiée pour une approche de précision, à laquelle une procédure d'approche manquée doit être amorcée si le contact visuel nécessaire n'a pas été établi. Voir aussi hauteur de décision. 1/8/76


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