The Engine Driven Pump (EDP): Powering Aircraft Systems silently

What is EDP: Engine Driven Pump?

The Engine Driven Pump (EDP) is a pump that is driven by the engine of the aircraft. EDP is an essential component of the aircraft’s hydraulic system. It is responsible for pressurizing various fluids needed for the operation of different systems on the aircraft. It plays a crucial role in maintaining proper hydraulic pressure, which is necessary for the functioning of various systems, including the landing gear, flight controls, and braking system. The EDP is driven directly by the aircraft’s engine, utilizing the engine’s mechanical power to generate hydraulic pressure. The typical EDP configuration is a pressure-compensated, variable displacement axial piston pump capable of varying the volume of fluid delivered to maintain hydraulic system pressure.

How Does the EDP Work?

The EDP operates by drawing hydraulic fluid from the aircraft’s hydraulic reservoir and pumping it at high pressure to the hydraulic system. It receives engine bleed air, which is compressed and heats up due to the engine’s operation, and passes it through a heat exchanger.

The heated bleed air then flows through the EDP’s turbine, causing it to rotate. As the turbine rotates, it drives the pump assembly, resulting in the generation of hydraulic pressure. The EDP utilizes a variable displacement mechanism to regulate the pump output and maintain the hydraulic pressure within the desired range.

The EDP is equipped with various sensors to monitor the system’s operation. These sensors provide crucial information, such as pressure and temperature readings, which are essential for ensuring the EDP’s proper functioning and detecting any abnormalities.

The Functions of the EDP

• The EDP provides the necessary hydraulic pressure to power various systems on the aircraft. The hydraulic system ensures the smooth operation of primary flight controls, landing gear, and other critical functions.
• The EDP pressurizes the fuel, ensuring that it flows smoothly and consistently to the engines. The pump maintains the required fuel pressure to meet the engine’s demands, ensuring optimal engine performance.
• The EDP also assists in the cooling system of the aircraft. The EDP circulates the cooling fluid, also known as the engine oil, through the engine’s cooling system. This allows the engine to operate within its optimal temperature range, preventing any damage caused by overheating.

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