Module 15. Gas Turbine Engine (Part-66)

Content: Part-66 Module 15. Gas Turbine Engine

1. Fundamentals

• Potential energy, kinetic energy, Newton's laws of motion, Brayton cycle;
• The relationship between force, work, power, energy, velocity,acceleration;
• Constructional arrangement and operation of turbojet, turbofan,turboshaft, turboprop.

2. Engine Performance

• Gross thrust, net thrust, choked nozzle thrust, thrust distribution, resultantthrust, thrust horsepower, equivalent shaft horsepower, specific fuelconsumption;
• Engine efficiencies;
• By-pass ratio and engine pressure ratio;
• Pressure, temperature and velocity of the gas flow;
• Engine ratings, static thrust, influence of speed, altitude and hot climate, flat rating, limitations.

3. Inlet

• Compressor inlet ducts;
• Effects of various inlet configurations;
• Ice protection.

4. Compressors

• Axial and centrifugal types;
• Constructional features and operating principles and applications;
• Fan balancing;
• Operation;
• Causes and effects of compressor stall and surge;
• Methods of air flow control: bleed valves, variable inlet guide vanes,variable stator vanes, rotating stator blades;
• Compressor ratio.

5. Combustion Section

• Constructional features and principles of operation.

6. Turbine Section

• Operation and characteristics of different turbine blade types;
• Blade to disk attachment;
• Nozzle guide vanes;
• Causes and effects of turbine blade stress andcreep.

7. Exhaust

• Constructional features and principles of operation;
• Convergent, divergent and variable area nozzles;
• Engine noise reduction;
• Thrust reversers.

8. Bearings and Seals

• Constructional features and principles of operation.

9. Lubricants and Fuels

• Properties and specifications;
• Fuel additives;
• Safety precautions.

10. Lubrication Systems

• System operation/lay-out and components.

11. Fuel Systems

• Operation of engine control and fuel meteringsystems including electronic engine control(FADEC);
• Systems lay-out and components.

12. Air Systems

• Operation of engine air distribution and anti-ice control systems, includinginternal cooling, sealing and external air services.

13. Starting and Ignition Systems

• Operation of engine start systems and components;
• Ignition systems and components;
• Maintenance safety requirements.

14. Engine Indication Systems

• Exhaust Gas Temperature/Interstage Turbine Temperature;
• Engine Thrust Indication: Engine Pressure Ratio, engine turbinedischarge pressure or jet pipe pressure systems;
• Oil pressure and temperature;
• Fuel pressure and flow;
• Engine speed;
• Vibration measurement and indication;
• Torque;Power.

15. Power Augmentation Systems

• Operation and applications;
• Water injection, water methanol;
• Afterburner systems.

16. Turbo-prop Engines

• Gas coupled/free turbine and gear coupled turbines;
• Reduction gears;
• Integrated engine and propeller controls;
• Overspeed safety devices.

17. Turbo-shaft engines

• Arrangements, drive systems, reduction gearing, couplings, controlsystems.

18. Auxiliary Power Units (APUs)

• Purpose, operation, protective systems.

19. Powerplant Installation

• Configuration of firewalls, cowlings, acoustic panels, engine mounts, antivibrationmounts, hoses, pipes, feeders, connectors, wiring looms, controlcables and rods, lifting points and drains.

20. Fire Protection Systems

• Operation of detection and extinguishing systems.

21. Engine Monitoring and Ground Operation

• Procedures for starting and ground run-up;
• Interpretation of engine power output and parameters;
• Trend (including oil analysis, vibration and boroscope) monitoring;
• Inspection of engine and components to criteria, tolerances and dataspecified by engine manufacturer;
• Compressor washing/cleaning;
• Foreign Object Damage.

22. Engine Storage and Preservation

• Preservation and depreservation for the engine and accessories/systems.