Latch device released by a first actuator in a normal mode of operation and released by a second actuator in an emergency mode of operation

摘要

A latch device 10 for latching an aircraft landing gear or an aircraft landing gear hatch comprises: a box 11 containing a set of hinged elements 12,14,16,17 mounted to pivot about respective parallel axes 13,15,18; at least one hook 12; and a locking lever 14 connected to the hook by associated elastically deformable return means 20, wherein the hook is capable of being unlocked either by a first actuator means 100 in a normal mode of operation, or by a second actuator means 200 in an emergency mode of operation when said first actuator means fails to unlock the hook 12. The first actuator is a low power electromechanical actuator 100 under independent electrical control 102, and is preferably an electromagnet. The second actuator means preferably comprises two electric motors 202 associated in an irreversible manner with a common differential gear train 203 and coupled to an outlet shaft 204 which controls the pivoting of an emergency unlocking lever 16 that co-operates with the locking lever 14.