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The EPR is computed by…

  • A
    dividing compressor discharge pressure by turbine discharge pressure.
  • B
    dividing turbine discharge pressure by compressor inlet pressure.
  • C
    multiplying compressor inlet pressure by turbine discharge pressure.
  • D
    multiplying compressor discharge pressure by turbine inlet pressure.
Some engines use the Engine Pressure Ratio (EPR) to control the thrust setting. The EPR is the ratio between the turbine discharge pressure (measured at the low-pressure turbine exhaust, which is the last stage of the engine) and the compressor inlet pressure (measured at the engine’s inlet, usually the first or second stage).

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