US 12,420,911 B2
Lower attachment for trimmable horizontal stabiliser actuator
Anh Vu Abdul Bari, Franconville (FR); and Raphael Medina, Ecouen (FR)
Assigned to GOODRICH ACTUATION SYSTEMS SAS, Saint-Marcel (FR)
Filed by Goodrich Actuation Systems SAS, Saint-Marcel (FR)
Filed on Dec. 6, 2023, as Appl. No. 18/530,566.
Claims priority of application No. 22306810 (EP), filed on Dec. 7, 2022.
Prior Publication US 2024/0190555 A1, Jun. 13, 2024
Int. Cl. B64C 13/28 (2006.01); F16H 25/20 (2006.01)
CPC B64C 13/28 (2013.01) [F16H 25/205 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A lower attachment for a trimmable horizontal stabiliser actuator (THSA) for connecting the THSA to a flight control surface, the lower attachment comprising:
a nut assembly for providing a load path through the THSA to the flight control surface when the THSA is connected to the flight control surface, comprising:
a nut for location on a screw shaft of the THSA,
a failsafe plate for coupling to the flight control surface, and
a transfer plate for transferring load between the failsafe plate and the nut;
wherein the nut assembly has a first unloaded configuration in which there is no contact between the nut and the transfer plate, and a second loaded configuration in which there is contact between a first pair of opposed surfaces of the nut and the transfer plate, and a clearance between a second pair of opposed surfaces of the nut and the transfer plate; and
a locking assembly operable to prevent relative movement of the nut and the transfer plate in response to the nut assembly transitioning to the second configuration;
the lower attachment also including a fuse arranged to move in response to transition of the nut assembly from the first configuration to the second configuration, and thereby indicate that transition.