Explanatory notes
… doors, escape chutes and slides, windows, port-holes, etc.). (2) Wings and their components (spars, ribs, … flaps, elevators, rudders, stabilisers, servo-tabs, etc.). (4) Nacelles, cowlings, engine pods and pylons. … (airscrews), rotors; blades for propellers and rotors; pitch control mechanisms for propellers and rotors. …