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A device which includes a turbine, governor, speedsensing device, and a gear box. Its power source is ram air. It is designed to produce a predetermined output shaft speed to operate a hydraulic pump and/or an electric generator drive, which furnishes emergency power to aircraft in case of hydraulic and/or electrical system failure. The unit may include the pump and/or the generator. For items which provide power during normal aircraft operation, see drive, constant speed (as modified).