Accession Number : ADD006722

Title :   Flutter Prevention Means for Aircraft Primary Flight Control Surfaces.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Macdonald,Kenneth A B

Report Date : 06 Nov 1979

Pagination or Media Count : 3

Abstract : An apparatus attached to the flight control surface designed to lock the surface in a fixed and generally neutral position when a hydraulic pressure failure occurs. A spring loaded hydraulic actuator is mounted in the fixed wing structure but has an arm with a locking roller extending into a wedge shaped recess in the adjacent movable control surface. When hydraulic pressure is present the actuator spring is compressed and the locking roller on the actuator arm is moved to the wide end of the wedge, effectively avoiding any contact between the roller and the flight control surface surrounding it irrespective of the control surface orientation. Upon the occurrence of a hydraulic pressure drop, the compressed spring translates the actuator arm drawing the locking roller into a detent in the narrow end of the wedge, thereby inhibiting control surface rotation and flutter. (Author)

Descriptors :   *Patents, *Aerodynamic control surfaces, *Flight control systems, Locking(Mechanics), Hydraulic actuators, Helical springs, Flutter, Prevention, Hydraulic power, Failure(Mechanics), Compensation

Subject Categories : Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE