What is the function of ACMP 3A after a dual engine failure?

The correct answer focuses on the role of the ACMP (AC Motor Pump) 3A during a critical failure scenario, such as a dual engine failure. In this situation, the aircraft's systems must rely on emergency procedures to ensure continued aircraft control and safety.

When both engines fail, the Auxiliary Power Unit (APU) or the Ram Air Turbine (RAT) can be deployed to provide emergency hydraulic power. The RAT generates hydraulic pressure which is essential for operating critical flight control systems and landing gear. ACMP 3A is an auxiliary component that assists in this situation by facilitating hydraulic pressure that helps maintain essential control functionality, contributing to the successful management of the aircraft.

Thus, the function of ACMP 3A in the context of a dual engine failure is directly linked to the use of the RAT, ensuring that the necessary hydraulic systems remain operational when primary system sources fail.