Abstract: A swivel access structure for an engine nacelle, including a door plate, a first fastener, second fasteners, a door frame, and one or more flame shields. The door plate is selectively rotatable about the first fastener, and the second fasteners selectively release the door plate to allow its rotation about the first fastener from a closed configuration to an open configuration. The door plate is rotatably attached to the door frame via the first fastener. The door frame has a frame opening covered by the door plate when the door plate is in the closed configuration and exposed when the door plate is in the open configuration. The one or more flame shields cover an inner side of the door plate and/or an inner side of the door frame. The swivel access structure provides access within the nacelle without spring arrangements that are more susceptible to fail fire testing.

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.