Revisions are to be made consistent with the format of their specification using the provisions of FAR 21.50 as a basis.

The turbine section of the engine includes items such as turbine nozzles and turbine rotors.

The combustion section is part of engine in which fuel and air are combined and burned.

The windows are those fuselage and crew compartment windows inclusive of windshield and also those windows installed in doors.

The flight compartment is the compartment above the floor and between the forward passenger partition and the forward pressure dome.

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.