Patent ID: 11878814
Assignee: BOMBARDIER INC.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A method for actuating a deployable upper step of an airstair of an aircraft, the method comprising:
using a primary deployment device, resiliently biasing the deployable upper step toward a deployed configuration during opening of a door of the aircraft; and
using a secondary deployment device movable in coordination with a movement of the door, driving the deployable upper step toward the deployed configuration during opening of the door and during a failure of the primary deployment device,
wherein:
the secondary deployment device comprises a command lever pivotally coupled to a fuselage of the aircraft and drivingly coupled for coordinated movement with the movement of the door;
the secondary deployment device comprises a first engaging member;
the deployable upper step comprises a second engaging member for engaging with the first engaging member;
the second engaging member is movable relative to the deployable upper step between a ceding position allowing the first engaging member to move past the second engaging member, and an interfering position interfering with movement of the first engaging member; and
the second engaging member is resiliently biased toward the interfering position.