Backdrive control system for aircraft flight control surfaces

Details Backdrive control system for aircraft flight control surfaces Backdrive control system for aircraft flight control surfaces

1988-11-14

1991-02-12

Jordan, Charles T.

Aeronautics and astronautics

Aircraft control

Pilot operated

244 75R, B64C 1340

Patent

active

049918001

ABSTRACT:
A backdrive system is provided for aircraft flight control surfaces, including a motor for driving a control surface. A fluid pressure responsive engaging/disengaging device is operatively associated between the motor and the control surface. The device may be a clutch normally engaged in the absence of to supply pressure or a brake normally disengaged in response to supply pressure. A supply of fluid pressure is connected to the device. An accumulator is connected in-line between the fluid pressure supply and the engaging/disengaging device for storing hydraulic energy during normal operation of the system and for releasing the stored hydraulic energy for at least a given period of time in the event of loss of supply pressure to allow the control surface to backdrive to a neutral position. A check-valve is provided between the fluid pressure supply and the accumulator to prevent return of hydraulic energy from the accumulator supply of fluid pressure when the supply pressure is lost. A bleed path is provided from the engaging/disengaging device to provide a time delay until the device is reengaged to lock up the control surface and prevent surface flutter.

REFERENCES:
patent: 2898889 (1959-08-01), Foster
patent: 3011741 (1961-12-01), Denniston
patent: 4173322 (1979-11-01), MacDonald
patent: 4496121 (1985-01-01), Berlin

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