🔵✈️ 151. Most important features of Engine Pressure Ratio (EPR) in an Aircraft 🚁

Source: FAA-H-8083-31A, Aviation Maintenance Technician Handbook– Airframe, Volume 2, Pag: 10-9

 

Aviation: Engine Pressure Ratio (EPR)

Turbine engines have their own pressure indication that relates the power being developed by the engine. It is called the engine pressure ratio (EPR) indicator (EPR gauge). 

This gauge compares the total exhaust pressure to the pressure of the ram air at the inlet of the engine. With adjustments for temperature, altitude, and other factors, the EPR gauge presents an indication of the thrust being developed by the engine. 

Since the EPR gauge compares two pressures, it is a differential pressure gauge. It is a remote-sensing instrument that receives its input from an engine pressure ratio transmitter or, in digital instrument systems displays, from a computer. 

The pressure ratio transmitter contains the bellows arrangement that compares the two pressures and converts the ratio into an electric signal used by the gauge for indication.

 

Nombre del Componente	Función Principal	Fuentes de Entrada de Presión	Método de Transmisión de Datos	Factores Operativos (Inferidos)	Mecanismo Físico
Indicador / Medidor de la Relación de Presión del Motor (EPR)	Indica el empuje del motor al relacionar las proporciones de presión.	Presión de escape total y presión de entrada de aire de impacto (ram).	Señal eléctrica desde el transmisor o señal digital desde una computadora.	Temperatura ambiente, altitud, humedad y estado del aire de purga del motor.	Medición de presión diferencial utilizando una disposición de fuelles.