What is the minimum pressure for the APU accumulator?

The minimum pressure for the APU (Auxiliary Power Unit) accumulator is critical to ensure proper system performance and safety.

In this context, the correct choice, 2000 PSI, is based on the operational requirements specified for the accumulator to function effectively. The accumulator stores high-pressure hydraulic fluid that is essential for starting the APU and supplying hydraulic power during specific operational conditions. Maintaining a minimum pressure of 2000 PSI ensures that there is enough energy available for immediate use when the APU is needed without compromising system integrity or performance.

Higher pressure options, such as 2100 PSI, 2200 PSI, and 2300 PSI, may not be the minimum required, which suggests that they exceed the necessary threshold for effective APU operation. Under these conditions, while those pressures may be acceptable operating points, they do not define the minimum pressure certification necessary to guarantee that the APU can perform its required functions reliably.