Emergency Gravity Free-fall Deployment Systems For Retractable Aircraft Landing Gear Assemblies

Abstract

Systems are disclosed to allow for the landing gear doors to be opened in the event of an emergency gravity free-fall landing gear deployment with little or no contact with the landing gear tires. The emergency gear extension systems according to the embodiments disclosed herein thus permit the free-fall movement of the landing gear to be synchronized with the opening of the associated gear doors. That is, according to the embodiments disclosed herein deployment of the landing gear assembly is time-delayed relative to the opening of the associated gear door(s). In such a manner, the landing gear assembly is synchronously released only after the associated gear door is in a safe position during its opening sequence thereby avoiding the risk that the gear door will jam the full extension of the landing gear during an emergency gear deployment due to contact between the landing gear tires and the gear door.

Description

technical field [0001] Embodiments disclosed herein relate generally to systems for emergency deployment of retractable aircraft landing gear assemblies. Background technique [0002] Aircraft with retractable landing gear must be provided with a dedicated system as a backup to the aircraft's normal on-board landing gear retract / extend system, which will allow in the event of an emergency (e.g., The normal airborne landing gear extension system is deployed to the extended state) to extend the aircraft's landing gear. Under normal circumstances, all emergency backup gear extension systems should be both easy to operate and completely separate from the normal on-board gear actuation system. [0003] There are several types of emergency backup landing gear extension systems routinely available to aircraft including, for example, electric actuation systems, hydraulic actuation systems, spring actuation systems, and energy transfer systems where the energy to release the landing...

AI Technical Summary

Problems solved by technology

[0005] However, additional structures and / or devices to ensure the opening of the gear doors during free fall of the gear are not effective in some cases, for example, in these cases the movement of the gear doors does not have Harmonious movement in the same direction of the landing gear of

In this case there is a real risk that the gear will jam its associated gear door and such an event is certainly unacceptable

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