Engine Power Terminology

  1. Flameout
    It refers to the unintentional extinguishing of the flame in the engine combustion chamber during engine operation
  2. Hot Start
    It is an engine start that results in any of the following conditions:

    1. T5 greater than 1090°C at any time;

    2. T5 greater than 980°C (but less than 1090°C) for more than 2 seconds:

    3. T5 greater than 925°C (but less than 980°C) for more than 10 seconds:

    Ttemperatures as high as 925°C are allowed without time limitation for the entire duration of the start

    Starting above 850°C are abnormal and should be investigated for cause
  3. Hung Start
    It is an engine  start attempt during which the engine fails to accelerate up to normal idle speed after having lit up
  4. NG
    It is the speed of the gas generator (37,500 rpm)

    Gas generator is directly controlled with the power lever
  5. NP
    It is the power section of the engine (33,000 rpm)

    The propeller speed is directly controlled with the prop lever
  6. Service Ceiling 
    The maximum density altitude at which the aircraft can maintain a climb rate of 100 feet per minute with both engines operating at maximum continuous power
  7. STOL
    Short Takeoff and Landing
  8. T5
    Temperature at Engine Station 5

    The temperature measured between the compressor turbine wheel and the power turbine wheel

    It is sometimes referred to as Interstage Turbine Temperature (ITT)
  9. Windmilling
    It refers to propeller rotation caused by airstream inputs, rather than engine inputs
Card Set
Engine Power Terminology