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Gas turbine engine

Basic Module 15

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Applicability

This module is required for the following AML categories:

Topics

Issued on Regulation (EU) 1321/2014

  • 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.
  • Gross thrust, net thrust, choked nozzle thrust, thrust distribution, resultant thrust, thrust horsepower, equivalent shaft horsepower, specific fuel consumption;
  • 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.
  • Compressor inlet ducts
  • Effects of various inlet configurations;
  • Ice protection.
  • 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.
  • Constructional features and principles of operation.
  • Operation and characteristics of different turbine blade types;
  • Blade to disk attachment;
  • Nozzle guide vanes;
  • Causes and effects of turbine blade stress and creep.
  • Constructional features and principles of operation;
  • Convergent, divergent and variable area nozzles;
  • Engine noise reduction;
  • Thrust reversers.
  • Constructional features and principles of operation.
  • Properties and specifications;
  • Fuel additives;
  • Safety precautions.
  • System operation/lay-out and components.
  • Operation of engine control and fuel metering systems including electronic engine control (FADEC);
  • Systems lay-out and components.
  • Operation of engine air distribution and anti-ice control systems, including internal cooling, sealing and external air services.
  • Operation of engine start systems and components;
  • Ignition systems and components;
  • Maintenance safety requirements.
  • Exhaust Gas Temperature/Interstage Turbine Temperature;
  • Engine Thrust Indication: Engine Pressure Ratio, engine turbine discharge pressure or jet pipe pressure systems;
  • Oil pressure and temperature;
  • Fuel pressure and flow;
  • Engine speed;
  • Vibration measurement and indication;
  • Torque;
  • Power.
  • Operation and applications;
  • Water injection, water methanol;
  • Afterburner systems.
  • Gas coupled/free turbine and gear coupled turbines;
  • Reduction gears;
  • Integrated engine and propeller controls;
  • Overspeed safety devices.
  • Arrangements, drive systems, reduction gearing, couplings, control systems.
  • Purpose, operation, protective systems.
  • Configuration of firewalls, cowlings, acoustic panels, engine mounts, anti-vibration mounts, hoses, pipes, feeders, connectors, wiring looms, control cables and rods, lifting points and drains.
  • Operation of detection and extinguishing systems.
  • 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 data specified by engine manufacturer;
  • Compressor washing/cleaning;
  • Foreign Object Damage.
  • Preservation and depreservation for the engine and accessories/systems.

Examination

  • AML Cat B1.1 & B1.3
    92 multi-choice and 0 essay questions.
    Time allowed: 115 minutes.

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