Aeronautics and astronautics – Aircraft control – Pilot operated
Patent
1994-05-24
1996-07-23
Kashnikow, Andres
Aeronautics and astronautics
Aircraft control
Pilot operated
244 75R, 244222, 244224, 244232, 74506, B64C 1314, G05G 502
Patent
active
055382096
ABSTRACT:
A hardover protection system for an aircraft. A differential motion sensor is mounted to a sector for receiving cockpit pitch commands input via a cable system. The motion sensor includes a pair of cranks held together by a predetermined spring preload. One of the cranks is coupled to a rod that forms a portion of a power linkage for hydraulically driving an elevator surface while the other is coupled to a rod that is linked to a shutoff valve. A linkage for mechanically driving an elevator control tab is also mounted to the sector. The design of the shutoff valve and its location within the aircraft's hydraulic control system interact to disable powered operation of the elevator surface upon a predetermined degree of deflection of the shutoff valve piston. Such deflection is responsive to the detection of a predetermined mismatch between the input command motion to the sector and the output motion of the power linkage. The shutoff condition is accompanied by unlocking of the manual linkage, releasing the control tab from the elevator surface and rendering its attitude directly responsive to the manual command input motion.
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Bowden James M.
Cook, deceased Thomas A.
Dailey Donald L.
Kashnikow Andres
Kramsky Elliott N.
McDonnell Douglas Corporation
Mojica Virna Lissi
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