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DeltaLima ♦
DeltaLima ♦
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Of more importance to the pilot in monitoring engine performance is the EPR or engine pressure ratioEngine Pressure Ratio (EPR) gauge.EPR is a ratio of compressor inlet pressure against exhaust pressure which shows the efficiency of the propulsion process front to back. EPR is measured in percentages, 100% being maximum thrust required to take off safely at a given aircraft weight, runway length and under prevailing weather conditions. EPR is a ratio of compressor inlet pressure against exhaust pressure which shows the efficiency of the propulsion process front to back. 

Of secondary concern to the pilot is TGT turbine gas temperaturethe Turbine Gas Temperature (TGT) sometimes also termed EGT exhaust gas temperature, termed Exhaust Gas Temperature (EGT) or TIT turbine inlet temperatureTurbine Inlet Temperature (TIT). Higher life engines will exhibit higher TGT up to a maximum safe limit for turbine blade life. 

Also of interest is the performance at a given fuel flow as measured on the fuel flow meter. RPM monitoring is of relatively insignificant performance provided max speeds are not exceeded during take off power. A high life almost worn out engine will not be able to produce its required take off EPR on a hot day, fully loaded aircraft on short runway without exceeding either TGT or RPM max limits. However, the same engine may produce sufficient EPR on a cold day, light loaded aircraft on a long runway. Pilots of 1970,s generation engines had to refer to charts when selecting "TAKE OFF EPR OF THE DAY". Modern FADEC engine controls make all the calcscalculations and adjustments automatically.

Of more importance to the pilot in monitoring engine performance is the EPR or engine pressure ratio gauge measured in percentages, 100% being maximum thrust required to take off safely at a given aircraft weight, runway length and under prevailing weather conditions. EPR is a ratio of compressor inlet pressure against exhaust pressure which shows the efficiency of the propulsion process front to back. Of secondary concern to the pilot is TGT turbine gas temperature sometimes also termed EGT exhaust gas temperature, or TIT turbine inlet temperature. Higher life engines will exhibit higher TGT up to a maximum safe limit for turbine blade life. Also of interest is the performance at a given fuel flow as measured on the fuel flow meter. RPM monitoring is of relatively insignificant performance provided max speeds are not exceeded during take off power. A high life almost worn out engine will not be able to produce its required take off EPR on a hot day, fully loaded aircraft on short runway without exceeding either TGT or RPM max limits. However, the same engine may produce sufficient EPR on a cold day, light loaded aircraft on a long runway. Pilots of 1970,s generation engines had to refer to charts when selecting "TAKE OFF EPR OF THE DAY". Modern FADEC engine controls make all the calcs and adjustments automatically.

Of more importance to the pilot in monitoring engine performance is the Engine Pressure Ratio (EPR) gauge.EPR is a ratio of compressor inlet pressure against exhaust pressure which shows the efficiency of the propulsion process front to back. EPR is measured in percentages, 100% being maximum thrust required to take off safely at a given aircraft weight, runway length and under prevailing weather conditions. 

Of secondary concern to the pilot is the Turbine Gas Temperature (TGT) sometimes termed Exhaust Gas Temperature (EGT) or Turbine Inlet Temperature (TIT). Higher life engines will exhibit higher TGT up to a maximum safe limit for turbine blade life. 

Also of interest is the performance at a given fuel flow as measured on the fuel flow meter. RPM monitoring is of relatively insignificant performance provided max speeds are not exceeded during take off power. A high life almost worn out engine will not be able to produce its required take off EPR on a hot day, fully loaded aircraft on short runway without exceeding either TGT or RPM max limits. However, the same engine may produce sufficient EPR on a cold day, light loaded aircraft on a long runway. Pilots of 1970,s generation engines had to refer to charts when selecting "TAKE OFF EPR OF THE DAY". Modern FADEC engine controls make all the calculations and adjustments automatically.

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Of more importance to the pilot in monitoring engine performance is the EPR or engine pressure ratio gauge measured in percentages, 100% being maximum thrust required to take off safely at a given aircraft weight, runway length and under prevailing weather conditions. EPR is a ratio of compressor inlet pressure against exhaust pressure which shows the efficiency of the propulsion process front to back. Of secondary concern to the pilot is TGT turbine gas temperature sometimes also termed EGT exhaust gas temperature, or TIT turbine inlet temperature. Higher life engines will exhibit higher TGT up to a maximum safe limit for turbine blade life. Also of interest is the performance at a given fuel flow as measured on the fuel flow meter. RPM monitoring is of relatively insignificant performance provided max speeds are not exceeded during take off power. A high life almost worn out engine will not be able to produce its required take off EPR on a hot day, fully loaded aircraft on short runway without exceeding either TGT or RPM max limits. However, the same engine may produce sufficient EPR on a cold day, light loaded aircraft on a long runway. Pilots of 1970,s generation engines had to refer to charts when selecting "TAKE OFF EPR OF THE DAY". Modern FADEC engine controls make all the calcs and adjustments automatically.