P A P E R - III Category B : AIRFRAME (AIRCRAFT HAVING AUW BELOW 5700 KGS INCLUDING ROTORCRAFT) ___________________________________________________________ 1. Aircraft Materials A general knowledge of the workshop processes , welding and protective treatments. A detailed knowledge of methods of assessment and removal of corrosion including treatment and reprotection. Knowledge of effect of various alloying elements used in steel, properties and their use. Detailed knowledge of Heat treatment of Steel and Aluminium. Detailed knowledge of surface hardening processes used on aircraft metals. Detailed knowledge of identification and physical charac- teristics of commonly used composite materials, plastics, sealants, fluids and rubbers and their inspection and re- pair. Detailed knowledge of metallic/ fabric materials used in aircraft structure; the types of defects associated with them; inspection for deterioration, and methods of recti- fication and reprotection; procedures for testing the sound- ness of these materials. Detailed knowledge of wooden structures and the adhesive used in them; types of defects; inspection for deteriora- tion; methods of rectification and reprotection, Detailed knowledge of inspection to prove soundness in wooden struc- tures and glued joints (applicable to only to aircraft having wooden structures). 2. Aerodynamics Elementary knowledge of the subsonic airflow and the various terms used therein. Detailed knowledge of the characteristics of the aerofoils. Knowledge of the forces acting on the Aircraft during all phases of flight. Knowledge of Aircraft Stability and Control. Elementary knowledge of the effect of altitude, weight, changes of engine power on performance of the aircraft. 3. Aircraft Structures Detailed knowledge of the various types of structures used in aircraft construction, Station Nos. Knowledge of fail-safe and safe-life concept. Detailed knowledge of damage tolerance, SSID, major repair. Detailed knowledge of NDT techniques and corrosion preven- tion. 4. Aircraft Systems General knowledge of the function and detailed knowl- edge of inspection and overhaul 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) Flight controls; hydraulics; pneumatics; landing gear; brakes; nose wheel steering; ice and rain protection; fire detection and protection, warning and extinguish- ing; oxygen; airconditioning and pressurization sys- tems; wheels; tyres; antiskid system. (d) Windows, doors and emergency exits. A detailed knowledge of the procedures for the overhaul/ testing of component parts of pneumatic, hydraulic, aircon- ditioning, oxygen, anti-icing, de-icing, fire extinguishing, rotorcraft transmission system (if applicable). 5. Inspection Of Aircraft Detailed knowledge of preparing the aircraft for complete overhaul/ inspection. Procedure of removal of main compo- nents. A general knowledge of preparation of inspection reports prior to repair/ overhaul. Knowledge of defect reporting, analysis, investigation and recording. A detailed knowledge of the use of workshop inspection aids, including NDT equipments, factors and limitations effecting the choice of equipment and methods of inspection used. A detailed knowledge of the assembly, approved repair schemes applicable to major components including engine mounting structures; inspection before, during and after repair including the alignment and symmetry checks. A detailed knowledge of the repair, inspection and testing of water, fuel and oil tanks, heat exchanger units, fuel and oil systems and all types of control systems. A detailed knowledge of the weighing of Aircraft and prepa- ration of weight schedule.Terms related to Aircraft weighing and preparation of aircraft before weighing. A detailed knowledge of the procedure for final inspection of an Aircraft after overhaul and major repair. A detailed knowledge of the care, use and checking for accuracy of special tools.