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main drive shaft
- Fonte1
- FEDERAL AVIATION ADMINISTRATION. Rotorcraft flying handbook (FAA-H-8083-21). Washington, DC: FAA, 2000. Disponível em: http://www.faa.gov/library/manuals/aircraft/media/faa-h-8083-21.pdf. Acesso em: 10 fev. 2012.
- Fonte2
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Manual of aircraft accident and incident investigation. Part I: organization and planning. 2nd ed. Montreal, 2014. (Doc. 9756)
- Nota Adicional1
- The main drive shaft(s) transmit power from the engine(s) to the transmission. The shaft may go directly into the transmission from the engine, as in a single-engine and some multiengine helicopters, or they may go through intermediate gearing, as in a combining gearbox or speed decreasing gearbox, before connection to the main transmission. In the event of a failure or malfunction of a main drive shaft, the first indication may be a low rpm warning. The warning can be misinterpreted as an engine-out condition. Another indication could be a loud noise or bang when the output shaft from the engine disconnects. Engine rpm is generally taken at a point before the engine output shaft. Items to be examined in a mishap where main drive shaft failure is suspected include lubricants, bearings, and gears. If a clutch is part of the power train and internal to a combining transmission, it too should be examined. Splined couplings and flex couplings are intended to permit pylon and shaft movement while maintaining continuity of the power through the main drive shaft.
- Contexto
- MAIN DRIVE SHAFT FAILURE: The main drive shaft, located between the engine and the main rotor gearbox, transmits engine power to the main rotor gearbox. In some helicopters, particularly those with piston engines, a drive belt is used instead of a drive shaft. A failure of the drive shaft or belt has the same effect as an engine failure, because power is no longer provided to the main rotor, and an autorotation has to be initiated.
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