Insurance structure and insurance method for airplane cabin door locking state

Abstract

The invention provides an insurance structure and insurance method for an airplane cabin door locking state. The insurance structure comprises a cabin door and a handle used for opening the cabin door, wherein the handle is constrained by a flight pneumatic lock, a body of the flight pneumatic lock is of a closed shell structure, the shell structure is divided into a first cavity and a second cavity which are adjacent through a flexible diaphragm, the diaphragm surface inside the first cavity is fixedly provided with a piston shaft, the first cavity is further provided with an air hole communicating with the air pressure inside an airplane cabin, in the second cavity, a precompression spring is arranged between the diaphragm and the cavity wall of the second cavity, the second cavity is further connected with a ventilation pipe, the ventilation pipe communicates with the atmospheric pressure outside the airplane cabin, in addition, a lock tongue capable of constraining the handle of the cabin door is arranged and is of a lever structure, the front end of the lock tongue is matched with a boss of the handle of the cabin door, the rear end of the lock tongue is in clearance hinged joint with the front end of the piston shaft, and the middle portion of the lock tongue is hinged and fixed into one supporting point.

Description

technical field [0001] The invention relates to the aircraft design technology, and further relates to an insurance structure and an insurance method for preventing the aircraft door from being opened during flight and in the locked state of the aircraft door. Background technique [0002] According to the airworthiness regulation CCAR25.783(b), each door of the aircraft must have measures to prevent it from being opened unintentionally during flight. In addition, design precautions must be taken to minimize the possibility of the door being intentionally opened in flight. At present, the flight electromagnetic lock activated by speed is mostly used as an insurance preventive measure for the locked state of the aircraft door to prevent the door from being deliberately opened during flight. The flight electromagnetic lock uses the battery as the power source. The disadvantage of this device is that the battery needs to be replaced regularly, and there is a possibility that t...

AI Technical Summary

Problems solved by technology

The flight electromagnetic lock uses the battery as the power source. The disadvantage of this device is that the battery needs to be replaced regularly, and there is a possibility that the flight electromagnetic lock will fail due to electromagnetic interference.

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