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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 for

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.

대표청구항 ▼

Apparatus for controlling the pitch of an aircraft elevator surface comprising, in combination: a) a cable comprising a pair of cable segments for inputting a pitch command; b) a disk-like sector having a grooved periphery for receiving said cable segments so that the angular orientation of said sec

Apparatus for controlling the pitch of an aircraft elevator surface comprising, in combination: a) a cable comprising a pair of cable segments for inputting a pitch command; b) a disk-like sector having a grooved periphery for receiving said cable segments so that the angular orientation of said sector is responsive to said pitch command; c) means for hydraulically adjusting said pitch of said elevator surface; d) a power linkage coupled to said sector for actuating said means in response to a change in the angular orientation of said sector; e) a manual linkage coupled to said sector for mechanically adjusting the attitude of a control tab in response to a change in the angular orientation of said sector; f) means engaged to said sector and to said power linkage for monitoring the relationship between said pitch command and power linkage motions; g) said last-named means further including means for disabling said means for hydraulically adjusting said pitch in accordance with the relationship between said pitch command and power linkage motion; and h) means, coupled to said last-named means, for locking said manual linkage when said relationship falls within predetermined limits and for unlocking said manual linkage when said relationship exceeds said predetermined limits whereby the attitude of said control tab is then responsive to the angular orientation of said sector.