Aircraft Engine Control System
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What is the primary function of the engine control system in a gas turbine engine?

  • To control the flow of fuel and air to the engine (correct)
  • To handle the complex functions of modern engines
  • To vary the aerodynamic and geometry of the engine
  • To manage the goals and objectives of engine and aircraft design

    • What is the main component of a gas turbine engine responsible for compressing air?

  • Nozzle
  • Compressor (correct)
  • Turbine
  • Combustion chamber

    • What type of aircraft engine is characterized by a large fan at the front that accelerates a significant amount of air?

  • Turbojet
  • Turboshaft
  • Turboprop
  • Turbofan (correct)

    • What is the purpose of the maximum fuel limit in a gas turbine engine?

    <p>To protect against combustor blow-out and surge/stall</p> Signup and view all the answers

    What is the primary function of the fuel flow control system in a gas turbine engine?

    <p>To regulate the fuel flow into the combustor</p> Signup and view all the answers

    What is the purpose of the turbine blade temperature limit in a gas turbine engine?

    <p>To prevent overheating</p> Signup and view all the answers

    What is the primary function of the intake case in a gas turbine engine?

    <p>To direct air into the compressor</p> Signup and view all the answers

    What is the purpose of the operational limits in a gas turbine engine?

    <p>To ensure safe operation within established limits</p> Signup and view all the answers

    What is the primary purpose of the fuel tanks and aircraft fuel pumps in an aircraft?

    <p>To supply fuel to the engines and auxiliary power unit</p> Signup and view all the answers

    What is the function of the Low Pressure Fuel Valve in the fuel tank?

    <p>To halt fuel flow in case of emergency</p> Signup and view all the answers

    What is FADEC in the context of aircraft engines?

    <p>Full Authority Digital Engine Control</p> Signup and view all the answers

    What is the primary function of the Engine Throttle Lever in the cockpit?

    <p>To control engine thrust</p> Signup and view all the answers

    What is the purpose of the Cockpit Indication system?

    <p>To display engine parameters and warning messages</p> Signup and view all the answers

    What is one of the key drivers of the design of an engine control system?

    <p>All of the above</p> Signup and view all the answers

    What is one of the environmental considerations in engine design?

    <p>All of the above</p> Signup and view all the answers

    What is the effect of increasing fuel pressure on the engine?

    <p>Increases gas temperature, resulting in higher engine speed</p> Signup and view all the answers

    What is despatchability in the context of aircraft operation?

    <p>The ability of an aircraft to depart on schedule</p> Signup and view all the answers

    What is the purpose of the variable inlet guide vanes (VIGVs) or variable stator vanes (VSVs)?

    <p>To maintain a safe margin from the engine surge line</p> Signup and view all the answers

    What is the purpose of qualification testing in engine control system design?

    <p>To demonstrate compliance with regulatory requirements</p> Signup and view all the answers

    What is the primary function of the Fuel Control Unit (FCU) or Fuel Management Unit (FMU)?

    <p>To maintain conditions demanded by the pilot</p> Signup and view all the answers

    What is the benefit of advanced diagnostic and prognostic capabilities in engine control systems?

    <p>All of the above</p> Signup and view all the answers

    What is the difference between VIGVs and VSVs?

    <p>VIGVs are used on smaller engines, while VSVs are used on larger engines</p> Signup and view all the answers

    What is the purpose of the pneumatic capsules in the FCU/FMU?

    <p>To modify flows according to prevailing atmospheric conditions</p> Signup and view all the answers

    What is the main advantage of the FADEC system?

    <p>It allows for more efficient engine operation</p> Signup and view all the answers

    What is the purpose of the dashpot/spring/damper combinations in the FCU/FMU?

    <p>To control the acceleration and deceleration rates</p> Signup and view all the answers

    What is the effect of changes in altitude, air temperature, and aircraft speed on the engine?

    <p>It changes the density of the air at the engine intake</p> Signup and view all the answers

    What is the primary difference between a Hydro-mechanical system and a FADEC system?

    <p>The level of automation in FADEC systems</p> Signup and view all the answers

    What is the purpose of the Health Status Annunciator (HSA) in a FADEC system?

    <p>To display fault reports to the flight and maintenance crew</p> Signup and view all the answers

    What is the benefit of using a FADEC system in terms of reliability?

    <p>A 54% increase in MTBF</p> Signup and view all the answers

    What is the function of the Fuel Flow Regulator (FFR) in a FADEC system?

    <p>To regulate fuel flow</p> Signup and view all the answers

    What is the advantage of FADEC systems in terms of weight?

    <p>A 62% decrease in weight</p> Signup and view all the answers

    What is the purpose of the Master Power Control Units (MPC-1 and MPC-2) in a FADEC system?

    <p>To control all aspects of the aircraft engine</p> Signup and view all the answers

    What is the full form of FADEC?

    <p>Full Authority Digital Engine Control</p> Signup and view all the answers

    What is the benefit of using a FADEC system in terms of cost?

    <p>A 63% decrease in cost</p> Signup and view all the answers

    What input variables does the FADEC system receive to determine the current flight condition?

    <p>Air density, throttle lever position, engine temperatures, engine pressures, and others</p> Signup and view all the answers

    What is the primary purpose of the FADEC system?

    <p>To provide optimum engine efficiency for a given flight condition</p> Signup and view all the answers

    What is the function of the EEC in the FADEC system?

    <p>It is the core of the FADEC system</p> Signup and view all the answers

    What type of sensors are used to measure engine speed?

    <p>Pulse probes</p> Signup and view all the answers

    What is the function of the FADEC system's power command?

    <p>To control engine actuators</p> Signup and view all the answers

    What is the purpose of the FADEC system's adaptive control?

    <p>To automatically take necessary measures to avoid exceeding engine limitations</p> Signup and view all the answers

    What is used to measure total temperature in the FADEC system?

    <p>Temperature probe</p> Signup and view all the answers

    What is the function of the FADEC system's engine health monitoring?

    <p>To provide engine health and maintenance reports</p> Signup and view all the answers

    What is used to measure fuel flow in the FADEC system?

    <p>Turbine flow meter</p> Signup and view all the answers

    What is the function of the FADEC system's prognostic?

    <p>To predict engine maintenance requirements</p> Signup and view all the answers

    Study Notes

    Aircraft Engine Control System

    Engine Control System Overview

    • The engine control system manages the flow of fuel and air to the engine
    • The system has to control the goals and objectives of engine and aircraft design
    • It also handles the increasing complexity of modern engines
    • Functions include:
      • Varying aerodynamic and geometry of the engine
      • Managing faults and monitoring engine health
      • Engine protection
      • Controlling cabin bleeds and power off-takes

    Components of a Gas Turbine Engine

    • Combustion chamber
    • Compressor
    • Intake case
    • Turbine
    • Nozzle

    Types of Aircraft Engines

    • Turbojet
    • Turboprop
    • Turbofan
    • Turboshaft

    Operational Limits

    • Structural limits:
      • Maximum fan and core speeds (N1 and N2)
      • Maximum turbine blade temperature
    • Safety limits:
      • Adequate stall margin (compressor and fan)
      • Lean burner blow out (minimum fuel)
    • Operational limit:
      • Maximum turbine inlet temperature
      • To provide long life for the engine

    Fuel Flow Control

    • Power or thrust can be controlled by regulating the fuel flow into the combustor
    • When higher thrust is required, throttle is opened and fuel pressure to the burner increases
    • Fuel control unit (FCU) or fuel management unit (FMU) is used to maintain conditions demanded by the pilot

    Air Flow Control

    • To ensure efficient operation over a wide range of environmental conditions
    • Can be controlled through variable inlet guide vanes (VIGVs) or variable stator vanes (VSVs)
    • VIGVs affect airflow at the inlet of the compressor
    • VSVs vary airflow within the compressor

    FADEC System Overview

    • Full Authority Digital Engine Control system
    • Autonomous control of the engine throughout its whole operating range
    • Comprises Electric Engine Control (EEC) and other accessories
    • Components include:
      • Master Power Control Units
      • Sensors for manifold temperature and pressure
      • Cylinder Head Temperature (CHT) sensor
      • Exhaust Gas Temperature (EGT) sensor
      • Speed sensors
      • Fuel pressure sensors
      • Low voltage harness
      • High voltage harness
      • Throttle body assembly
      • Health Status Annunciator (HSA)
      • Fuel injection system

    How FADEC Works

    • Receives multiple input variables of the current flight condition
    • Computes engine operating parameters such as fuel flow, stator vane position, and bleed valve position
    • Provides optimum engine efficiency for a given flight condition
    • Allows manufacturers to program engine limitations and receive engine health and maintenance reports

    Data and Sensors

    • Sensors located within the gas turbine engine
    • Signals and sensors include:
      • Throttle position
      • Air data (altitude and airspeed)
      • Total temperature
      • Engine speed
      • Engine temperature
      • Pressure ratio
      • Nozzle position
      • Fuel flow
      • Fuel flow control
      • Air flow control

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    Related Documents

    ESA 272 Aircraft Sub-systems Engine Control System PDF

    Description

    This quiz covers the overview of aircraft engine control systems, including their functions, goals, and objectives. It also explores the components and features of modern engine control systems.

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