P A P E R III Category I : AIRCRAFT INSTRUMENTS ___________________________________________________________ 1. Terminology and Conversion Knowledge of the general Instrument terminology; conversions of measuring units from one system to another. 2. General Concepts Knowledge of the atmosphere. Knowledge of fundamentals of electricity. Knowledge of principle of operation and characteristics of DC and AC Generators and Motors; and speed control and reversing the direction of motors. Knowledge of principle of operation of transformers and amplifiers. Detailed knowledge of the construction, principle of opera- tion of servomotors and rate generators and system response to displacement (position) and rate (velocity) command signals; purpose of pullup and feedback signals; causes of hunting and methods of damping; troubleshooting of servo- mechanisms. Knowledge of basic principle of thermionics and properties of semi-conductor materials. Knowledge of symbols, truth tables and equivalent circuits for logic gates. Knowledge of the terms used, basic operation and interfacing of major components of computer. Knowledge of the types and operation of displays (LED, Liquid Crystal etc.). Knowledge of CRTs and its application. Knowledge of functions performed and overall operation of a microprocessor. Knowledge of handling of microelectronic circuit devices (Electrostatic Sensitive Devices (ESD)). General understanding of the terms relating to Theory of Flight : Longitudinal Axis, Lateral Axis and Vertical Axis, Yawing, Rolling, Pitching, Azimuth Heading, Course, side- slip, skidding, Coordinated turn, Stability, angle of attack, chord, stall, lift, drag, thrust. General knowledge of the purpose and action of primary control surfaces, trim tabs and wing flaps. Knowledge of the principle of operation, construction and characteristics of pressure sensitive and temperature sensi- tive elements. Knowledge of the principle of operation, constructional features and characteristics of Gyroscopes. 3. Aircraft Instruments and systems Knowledge of principle of operation and construction; detailed knowledge of procedures of replacement, field maintenance, functional testing and trouble shooting of : Altimeters, Airspeed Indicators, Vertical Speed Indicators, pitot heads, pitot static lines, static selectors and mois- ture traps; Air Driven Gyros, Artificial Horizons and Turn and Bank Indicators; Venturi tubes, vacuum pumps, relief valves, regulators, check valves and filters; Turn and Bank indicators operated by direct gauges; Capillary tube type pressure and temperature gauges; Position Indicators operated by Direct Current; Fluid Quantity Indicators operated by Direct current and Capacitors; Wheatstone bridge; ratiometer and thermocouple type tempera- ture Indicators; Three Phase engine rpm indicators and synchroscopes; Centrifugal governor type and magnetic drag-cup type engine rpm indicators; Direct reading and remote reading compasses; AC operated gyro instruments; AC synchro instruments. 4.Autopilot System Knowledge of function and operation of components in a typical Autopilot system; responses of the system in flight and during functional checks on ground. 5. Oxygen System Knowledge of function, layout and features of components of typical oxygen system; and detailed knowledge of the replacement procedures and safety precautions to be observed. 6. Inertial Navigation System Knowledge of principle of operation and function of the components of Inertial Navigation System. 7. Satellite Communication Elementary principle of satellite Communication and its application to aircraft.