Aircraft Engine Instrument System Review
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Questions and Answers

What is the definition of engine pressure ratio?

  • The total pressure ratio between the aft end of the compressor and the aft end of the turbine (correct)
  • The total pressure ratio between the aft end of the turbine and the front of the engine inlet
  • The total pressure ratio between the front of the engine inlet and the aft end of the compressor
  • The total pressure ratio between the front of the compressor and the rear of the turbine

    • Which of the following instrument conditions requires immediate correction?

  • Case paint chipped
  • Red line missing
  • Pointer loose on shaft (correct)
  • Mounting screws loose

    • What is a characteristic of a thermocouple-type temperature indicating instrument system?

  • It is a digital-type, temperature-measuring instrument
  • It usually contains a balancing circuit in the instrument case (correct)
  • It is a balanced-type, variable resistor circuit
  • It requires an external power source

    • What produces the indication on a thermocouple-type cylinder head temperature indicator?

    <p>A current generated by the temperature difference between dissimilar metal hot and cold junctions</p> Signup and view all the answers

    What determines the voltage output of a thermocouple system?

    <p>The temperature difference between the two ends of the thermocouple</p> Signup and view all the answers

    What type of electric motors are commonly used in electric tachometers?

    <p>Direct current, series-wound motors</p> Signup and view all the answers

    What is provided by a computerized fuel system (CFS) with a totalizer-indicator, in addition to fuel quantity?

    <p>Fuel flow rate</p> Signup and view all the answers

    What is the primary function of a balancing circuit in a thermocouple-type temperature indicating instrument system?

    <p>To prevent fluctuations of the system voltage from affecting the temperature reading</p> Signup and view all the answers

    On a twin engine aircraft with fuel-injected reciprocating engines, what is the probable cause of a fuel-flow indicator reading considerably higher than the other in all engine operating configurations?

    <p>One more fuel nozzles are clogged</p> Signup and view all the answers

    What is the principal fault in the pressure type fuel flow meter indicating system installed on a horizontally opposed continuous-flow fuel-injected aircraft reciprocating engine?

    <p>A plugged fuel injection nozzle will cause a higher than normal fuel flow indication</p> Signup and view all the answers

    What is the purpose of a manifold pressure gauge?

    <p>To indicate absolute pressure in the intake manifold</p> Signup and view all the answers

    Where is the turbine discharge pressure indicator sensor typically located in a turbine engine?

    <p>Immediately aft of the last turbine stage</p> Signup and view all the answers

    What is an indication of unregulated power changes that result in continual drift of manifold pressure indication on a turbo supercharged aircraft engine known as?

    <p>Bootstrapping</p> Signup and view all the answers

    What does the engine pressure ratio (EPR) indicate?

    <p>The engine's thrust produced</p> Signup and view all the answers

    What would be the effect of a plugged fuel injection nozzle on the fuel flow meter reading?

    <p>A higher than normal fuel flow indication</p> Signup and view all the answers

    What is the primary purpose of a fuel flow meter?

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

    Study Notes

    Engine Instrument System

    • Engine pressure ratio is the total pressure ratio between the aft end of the compressor and the aft end of the turbine.

    Instrument Conditions

    • The following instrument conditions are NOT acceptable and require immediate correction: red line missing, pointer loose on shaft, glass cracked, mounting screws loose, leaking at line B nut, will not zero out, and fogged.
    • A case paint chip is an acceptable condition and does not require immediate correction.

    Thermocouple-Type Temperature Indicating Instrument System

    • A thermocouple-type temperature indicating instrument system requires no external power source.
    • It usually contains a balancing circuit in the instrument case to prevent fluctuations of the system voltage from affecting the temperature reading.

    Thermocouple-Type Cylinder Head Temperature Indicator

    • The indication on a thermocouple-type cylinder head temperature indicator is produced by a current generated by the temperature difference between dissimilar metal hot and cold junctions.
    • The voltage output of a thermocouple system is determined by the temperature difference between the two ends of the thermocouple.

    Electric Motors in Electric Tachometers

    • Direct current, series-wound motors are commonly used in electric tachometers.

    Computerized Fuel System (CFS) with Totalizer-Indicator

    • A computerized fuel system (CFS) with a totalizer-indicator provides indication of fuel flow rate, fuel used since reset or initial start-up, and fuel time remaining at current power setting.

    Fuel Flow Meter Indicating System

    • A plugged fuel injection nozzle will cause a higher than normal fuel flow indication in a pressure type fuel flow meter indicating system.
    • On a twin engine aircraft with fuel-injected reciprocating engines, a significantly higher fuel-flow indicator reading on one engine likely indicates a faulty fuel nozzle.

    Manifold Pressure Gauge

    • A manifold pressure gauge is designed to indicate absolute pressure in the intake manifold.

    Turbine Discharge Pressure Indicator Sensor

    • The turbine discharge pressure indicator sensor is located immediately aft of the last turbine stage in a turbine engine.

    Unregulated Power Changes

    • An indication of unregulated power changes that result in continual drift of manifold pressure indication on a turbo supercharged aircraft engine is known as bootstrapping.

    Engine Pressure Ratio (EPR)

    • Engine pressure ratio (EPR) is a ratio of the total pressure ratio between the aft end of the compressor and the aft end of the turbine, and indicates the thrust produced.

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    Description

    Review questions on engine instrument systems, covering topics such as engine pressure ratio and instrument conditions. Designed for powerplant reviewers and enthusiasts.

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