Explanatory notes
… compartments, floors, instrument panels, frames, doors, escape chutes and slides, windows, port-holes, etc.). … whether or not movable (ailerons, slats, spoilers, flaps, elevators, rudders, stabilisers, servo-tabs, etc.). … wheels (with or without tyres); landing skis. (6) Seaplane floats. (7) Propellers (airscrews), rotors; …