English is not often the native language of the readers of technical documentation.

Inspection and observation are the windows used for examining compartments and equipment in and about the airplane, including items such as transparent material, its frame, etc.

Auxiliary structure includes leading edge, trailing edge, wing tip, tip fuel tank and fuel or water cell backing boards, not including plates/skin.

Attach fittings are the fittings on the wing used for the attachment of fuselage, nacelle/ pylon, and landing gear to the wing and for the support of equipment within the wing.

Flight surfaces are the structure of removable airfoils attached to the wing including items such as ailerons, flaps, spoilers, tabs, drag and balancing devices, etc.

Elevator/Elevon is the removable airfoil which is used for longitudinal/longitudinal and lateral control.

The horizontal airfoil of the tail/ nose section to which the elevator/ canard is attached includes items such as spars, ribs, stringers, plates/skin, access covers, tips, etc.

The horizontal and vertical stabilizers include the structure of the elevator and rudder.

Storage is that portion of the system used for storage of oil. It includes items such as tanks, filling systems, internal hoppers, baffles, tank sump and drain, etc.

Noise suppressor includes items such as pipes, baffles, shields, actuators, plumbing, linkages, position indicators, warning systems, etc.

Oil are those units and components external to the engine concerned with storing and delivering lubricating oil to and from the engine.