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- Definição1
- A specified altitude or height in the precision approach or approach with vertical guidance at which a missed approach must be initiated if the required visual reference to continue the approach has not been established.
- Fonte1
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. International civil aviation vocabulary. 3rd ed. Montreal, 2007. (Doc. 9713)
- Definição2
- (1) 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 of 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). (2) 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.
- Fonte2
- KUMAR, Bharat (ed.). An illustrated dictionary of aviation. New York: McGraw-Hill, c2005. 752 p.
- Definição3
- A specified altitude in the precision approach, charted in height above threshold elevation, at which a decision must be made either to continue the approach or to execute a missed approach.
- Fonte3
- FEDERAL AVIATION ADMINISTRATION. Pilot's handbook of aeronautical knowledge. [s.l.], 2008. Disponível em: http://www.faa.gov/regulations_policies/handbooks_manuals/av iation/pilot_handbook/media/PHAK%20-%20Cover-Preface.pdf. Acesso em: 26 jun. 2014.
- Nota adicional1
- Acronym in English: DA.
- Nota adicional2
- Information regarding this term is a result of researches developed by DECEA in cooperation with ANAC.
- Contexto
- Decision altitude (DA) or decision height (DH). A specified altitude or height in a 3D instrument approach operation at which a missed approach must be initiated if the required visual reference to continue the approach has not been established. Note 1.- Decision altitude (DA) is referenced to mean sea level and decision height (DH) is referenced to the threshold elevation.
- Subárea
- Operations
- Piloting
- Related Term
- decision height
- Spanish
- altitud de decisión