An upper attachment system for a trimmable horizontal stabiliser actuator (THSA) comprises: a housing 11 holding a yoke 2 and a ballscrew 3; a nut 4 coupled to the housing 11 and cooperating with the ballscrew 3 such that rotation of the ballscrew 3 relative to the nut4 results in linear motion of the ballscrew 3; a recess formed between the yoke 2 and the ballscrew 3 and arranged to receive, in use, an upper part 27 of a tie bar 29 of the secondary load path of the actuator; and a biasing mechanism 6, 7, 8 arranged such that, in use, when no axial load is applied to the tie bar 29, the yoke 2 and the ballscrew 3 are held by balanced forces from the biasing mechanism 6, 7, 8 in a position within the recess, and such that when, in use, an axial load is applied to the yoke 2 by the upper part 27 of the tie bar 29, the balanced forces from the biasing mechanism 7, 8, 9 are overcome and the axial load along with the biasing mechanism 7, 8, 9 results in linear motion of the ballscrew 3 in a first axial direction relative to the nut 4, wherein the linear motion moves the ballscrew 3 toward the yoke 2 and closes the recess around the upper part 27 of the tie bar 29.
Upper attachment for trimmable horizontal stabiliser actuator
OBERE BEFESTIGUNG FÜR EINEN TRIMMBAREN HORIZONTALEN STABILISATORAKTUATOR
FIXATION SUPÉRIEURE POUR ACTIONNEUR DE STABILISATEUR HORIZONTAL COMPENSABLE
2017-10-25
Patent
Electronic Resource
English
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