Aeronautics and astronautics – Aircraft control – Automatic
Patent
1976-10-01
1978-08-15
Kunin, Stephen G.
Aeronautics and astronautics
Aircraft control
Automatic
244182, G05D 112
Patent
active
041067304
ABSTRACT:
A control system for automatically activating the flight control surfaces of a STOL aircraft that utilizes upper surface blown flaps when the aircraft executes a STOL landing or takeoff maneuver with one engine inoperative in that the engine does not provide the desired or scheduled amount of thrust. The system monitors internal engine pressure of each engine to detect such engine failure and deploys the upper surface blown flaps, conventional flaps and spoilers used as direct lift control devices to provide a relatively uniform lift distribution across the aircraft wing and hence lower induced drag. When the aircraft executes a STOL takeoff procedure with an engine, that does not provide the proper thrust level the upper surface blown flap located aft of that engine is automatically extended to a position that matches the position of those conventional flaps located outboard of the inoperative engine. Closable spanwise slots in the extended upper surface blown flap are opened to cause the upper surface blown flap to effectively function as a conventional slotted flap. During a STOL landing maneuver with an inoperative engine, the system automatically extends the upper surface blown flap located aft of the inoperative engine, opens the spanwise slots in the extended upper surface blown flaps, and compensates for roll moment caused by the inoperative engine by partially retracting the conventional flaps of the wing not including the inoperative engine. Additionally, if the spoilers are being extended as direct lift control devices, the system retracts the spoilers to further reduce drag and flatten the glide path angle.
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R. L. McPherson, "A Pilot's View of the YC-14 Airplane", SETP 1975 Report to the Aerospace Profession XIX, vol. 12, No. 4, pp. 99-116, 9-24-1975.
R. A. Curnett et al., "Electronic Systems Contribution to YC-14 Performance", IEEE 1975 Electronics and Aerospace Conference, pp. 199-200-I, 10-1-1975.
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May, III Fred W.
Spitzer Robert E.
Kunin Stephen G.
The Boeing Company
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