P A P E R - III Category A : AIRFRAME (AIRCRAFT HAVING AUW 5700 KG. AND ABOVE) ___________________________________________________________ 1. Aircraft Materials Knowledge of effect of various alloying elements in the structure of steel/ Aluminium, their properties and use. Knowledge of Heat treatment of Steel and Aluminium. Knowledge of surface hardening processes used on aircraft metals. Knowledge of identification and physical characteristics of commonly used composite materials, plastics, sealants and rubbers and their inspection and repair. Detailed knowledge of metallic materials used in aircraft structure; the types of defects associated with them; inspection for deterioration, and methods of rectification and reprotection; procedures for testing the soundness of these materials. Detailed knowledge of the various types of corrosion com- monly encountered on aircraft metals, their removal and methods employed to prevent corrosion. Knowledge of use of hardness testing machines, various types of hardness no. and surfaces finishes. 2. Aerodynamics Knowledge of the characteristics of the subsonic, transonic and supersonic airflow and the various terms used therein. Knowledge of the characteristics of the aerofoils used for subsonic and transonic flights. Knowledge of the forces acting on the Aircraft during all phases of flight. Detailed knowledge of Aircraft Stability and Control. Knowledge of the effect of altitude, weight, changes of engine power on performance of the aircraft. Knowledge of various types of high lift and drag devices, their operation, vortex generators, boundary layer fences etc. Knowledge of the following : Sweepback wing; High incidence tailplane; aerodynamic loading; superstall; load factors; aquaplaning; fly by wire concept. 3. Aircraft Structures General understanding of the various types of structures used in Aircraft construction, Station Nos. Knowledge of fail-safe and safe-life concept. Knowledge of such terms as damage tolerance, ageing aircraft, SSID. 4. Aircraft Systems General knowledge of the function, maintenance and inspection of the following : (a) Structure and structural components constructed from metal, glass fibre, glass reinforced plastic, vinyl, perspex. (b) Furnishing materials, paints, surface finishes and associated materials. (c) Elementary flight controls including power operated/ assisted flight controls; hydraulics; pneumatics; landing gear; brakes; nose wheel steering; wheels; tyres; antiskid; ice and rain protection; fire detec- tion and protection, warning and extinguishing; oxygen; airconditioning and pressurization systems; life saving equipment including inflatable slides, dinghies and rafts. (d) Windows, doors and emergency exits. 5. Aircraft Instruments and Equipments Elementary knowledge of the operational principles of all instruments (except the engine related instruments). Knowledge of construction of various types of Direct Reading Compass, various related terms used in electricity/ magnet- ism, and compass swing precautions and procedures. 6. Inspection Of Aircraft Knowledge of minor defects and various methods of rectifica- tion and repair of minor defects, rigging of aircraft, periodical inspection necessary to check the serviceability of the Aircraft, inspection of the Aircraft after heavy landing, lightening strike and abnormal flight loads, prepa- ration of a brief report with the help of sketches if neces- sary in case of damage to the Aircraft. Knowledge of terms related to aircraft weighing, prepara- tion/ precaution and method of weighing the aircraft. Knowledge of duplicate inspection of control systems.