Accession Number : ADD003509

Title :   Mode Shift and Redundant Control.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Townsend,Richard F

Report Date : 23 Dec 1976

Pagination or Media Count : 15

Abstract : A mechanism for an aircraft having a primary hydraulically operated flight control system with a plurality of hydraulic actuators, and a redundant secondary manually operated mechanical flight control system. The mechanism provides for the automatic and immediate operability of the manually operated system, when the hydraulic system fails. The mechanism includes mechanical locks in each hydraulic actuator, with the locks linked together to move in unison. The locks are preloaded by springs, and hydraulic pressure in any of the actuators maintains the locks in an open condition. However, in the event that hydraulic pressure is completely lost, the locks become operable (i.e., close) and permit the continued control of the aircraft by use of the manually operated mechanical flight control system. (Author)

Descriptors :   *Patent applications, *Flight control systems, Manual operation, Hydraulic actuators, Redundant components

Subject Categories : Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE