When the primary load path of a trimmable horizontal stabiliser actuator fails, the load may be transferred through a secondary load path. A functional backlash exists between these load paths, and can cause flutter of a flight surface when the secondary load path is loaded. The present invention therefore provides a connection for a lower attachment for a trimmable horizontal stabiliser actuator (THSA) for connecting the lower attachment to a flight control surface; comprising: a surface bracket (140) for coupling to a flight control surface, the surface bracket mounted about a gimbal (130) of the lower attachment by a bushing (110) disposed between the gimbal and the surface bracket; a failsafe plate (120) fittingly engaged on a first end of the bushing; and a tightening ring (170) mounted on a second end of the bushing opposite the first end and secured to the surface bracket by at least one contact screw (160), such that the contact screw is operable to urge the bushing against the failsafe plate.
LOWER ATTACHMENT FOR TRIMMABLE HORIZONTAL STABILISER ACTUATOR
UNTERE BEFESTIGUNG FÜR EINEN TRIMMBAREN HORIZONTALEN STABILISATORAKTUATOR
FIXATION INFÉRIEURE POUR ACTIONNEUR DE STABILISATEUR HORIZONTAL RÉGLABLE
2021-03-17
Patent
Electronic Resource
English
LOWER ATTACHMENT FOR TRIMMABLE HORIZONTAL STABILISER ACTUATOR
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