FIREPROOF SIGHT GLASS WINDOW FOR ENGINE NACELLE
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United States of America Patent
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Issued Date -
Oct 17, 2024
app pub date -
Apr 11, 2023
filing date -
Apr 11, 2023
priority date (Note) -
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status (Latency Note)
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Abstract
A sight-viewing structure for an engine nacelle, including a sight glass that is translucent or semi-translucent, a mounting frame, and a flame shield. The sight glass allows checking of oil levels of an aircraft engine accessory gearbox within the nacelle without doors and springs that can be more susceptible to fail fire testing. The mounting frame has an outer side, an inner side opposite the outer side, and a frame opening formed through the mounting frame. The frame opening is covered by the sight glass, and the mounting frame is configured for attachment to an inner surface of the engine nacelle at a location with a hole through the engine nacelle, such that the sight glass can be viewed through the hole. A flame shield may be made of composite materials and covers the inner side of the mounting frame and peripheral edge regions of the sight glass.
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