NSN 1560-01-663-4718

A rigid item of various shapes permanently attached to a structure of an aircraft, designed to provide access for inspection, service, replacement of components and/or adjustments. it is designed to be attached by means of hinges or similar device. it may include self-closing features and have a quick release or other type latching to permit access with a minimum of effort. it may include an observation window. excludes cover, access; cover access, aircraft; door, access; door, aircraft and all doors not specifically designed to provide access for the purposes listed above.