What is ACMP on Boeing 737? (Alternating Current Motor Pump (See Also Acmp))

The Alternating Current Motor Pump (ACMP), also known as the ACMP, is a crucial component in the hydraulic system of the Boeing 737 aircraft. It plays a significant role in ensuring the proper functioning of various hydraulic systems, contributing to the overall performance and safety of the aircraft. In this article, we will explore the importance of the ACMP, its functions, and its impact on the Boeing 737 aircraft.

Before diving into the technical aspects, let’s understand what a hydraulic system is and its significance in an aircraft. Hydraulic systems use fluids to transmit power and control various systems, such as landing gears, brakes, flaps, and flight controls. These systems rely on the force generated by pressurized fluids to function effectively. The ACMP, being an integral part of the hydraulic system, is responsible for powering and pressurizing the fluid to ensure smooth operation of these systems.

The Functions of the Alternating Current Motor Pump (ACMP)

The primary function of the ACMP on the Boeing 737 is to generate hydraulic pressure by converting electrical energy into mechanical energy. This conversion is accomplished through an electric motor that drives a hydraulic pump. The pump, in turn, pressurizes the hydraulic fluid, allowing it to flow through the system and operate the necessary components.

The ACMP is designed to deliver high-pressure output, capable of meeting the demands of various hydraulic systems on the aircraft. It ensures the consistent and reliable supply of power to the hydraulic system, enabling the aircraft to perform critical functions, such as retracting and extending landing gears and controlling flight surfaces.

Additionally, the ACMP incorporates safety features to prevent system failures. It includes pressure relief valves that automatically release excess pressure to safeguard the system from damage. These valves ensure that the hydraulic system remains within its operating limits, enhancing the overall reliability and safety of the aircraft.

The Impact of the ACMP on Boeing 737

The ACMP’s efficient operation directly influences the overall performance and safety of the Boeing 737 aircraft. A malfunctioning or inadequate ACMP can lead to a range of issues, including hydraulic system failures and loss of critical functions.

With the advanced hydraulic system and reliable ACMP, the Boeing 737 is equipped to handle various operational conditions, ensuring smooth and controlled flight. The ACMP’s ability to deliver high-pressure output allows for quick response times, enabling the aircraft to perform critical maneuvers and adjustments swiftly.

Moreover, the ACMP’s safety features, such as pressure relief valves, play a significant role in preventing catastrophic failures in the hydraulic system. These valves maintain the system’s integrity by releasing excess pressure, avoiding potential damage to critical components. This enhances the overall reliability and safety of the aircraft during normal operations and emergency scenarios.


The Alternating Current Motor Pump (ACMP) on the Boeing 737 is a crucial component in the aircraft’s hydraulic system. Its functions include generating hydraulic pressure, powering various systems, and ensuring the reliability and safety of the aircraft. The ACMP’s high-pressure output and safety features contribute to the Boeing 737’s overall performance, allowing for smooth and controlled flight operations.

Understanding the importance of the ACMP helps us appreciate the complexity and precision of the systems that make modern aircraft like the Boeing 737 capable of safe and efficient flight.

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