Patent ID: 9517842
Filing Date: 2016-12-13
CPC Classification: B64C,B64D,F02C,Y02T

Claim Text:
1. An aircraft engine barrier filtration system comprising: an engine barrier filter layer positioned near an aircraft engine intake, the filter layer to filter aircraft engine intake air; and a passive one-way check valve assembly positioned adjacent to the engine barrier filter layer, the passive one-way check valve assembly to permit the engine intake air to flow into the engine in a first flow direction through the filter layer during a first aircraft operation mode and to substantially prevent air flow away from the engine in a second flow direction through the filter layer opposite the first flow direction during a second aircraft operation mode that is different from the first aircraft operation mode; wherein the check valve assembly comprises a system of reed valves; with: a first layer comprising a plurality of openings; and a second layer attached to the first layer, the second layer comprising a plurality of reeds, each reed aligned with a corresponding opening of the plurality of openings.