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Back to: "D"deviation
- Definição1
- (1) The angular difference between a magnetic and a compass heading. It is a compass error caused by the compass magnet attempting to align with the aircraft's local magnetic field. The deviation error changes with the aircraft heading and the latitude. It is measured in degrees east (+) or west (-), depending on whether the north-seeking end of the compass needle lies to the east or west of magnetic north. (2) The angle between the wind and the pressure gradient.
- Fonte1
- KUMAR, Bharat (ed.). An illustrated dictionary of aviation. New York: McGraw-Hill, c2005. 752 p.
- Definição2
- A compass error caused by magnetic disturbances from the electrical and metal components in the aircraft. The correction for this error is displayed on a compass correction card place near the magnectic compass of the aircraft.
- Fonte2
- 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.
- Fonte3
- FEDERAL AVIATION ADMINISTRATION. Helicopter flying handbook (FAA-H8083-21A). Washington, DC: FAA, 2012.
- Nota adicional1
- The reduced form "dev" is also used.
- Nota adicional2
- Information regarding this term is a result of researches developed by DECEA in cooperation with ANAC.
- Contexto
- Besides the magnetic fields generated by the earth, other magnetic fields are produced by metal and electrical accessories within the helicopter. These magnetic fields distort the earth's magnet force and cause the compass to swing away from the correct heading. Manufacturers often install compensating magnets within the compass housing to reduce the effects of deviation. These magnets are usually adjusted while the engine is running and all electrical equipment is operating. Deviation error, however, cannot be completely eliminated; therefore, a compass correction card is mounted near the compass. The compass correction card corrects for deviation that occurs from one heading to the next as the lines of force interact at different angles.
- Subárea1
- Air Navigation
- Related Term
- altitude deviation
- compass deviation
- course deviation
- lateral deviation
- lateral deviation display
- path deviation
- Português
- desvio