What does the APU require in terms of accumulator pressure for a normal start?

For the Auxiliary Power Unit (APU) to achieve a normal start, it is essential to maintain an accumulator pressure of at least 2800 PSI. This pressure ensures that the APU has the necessary hydraulic power to initiate and sustain the starting sequence effectively.

The specified pressure provides adequate energy to engage the APU's start system and activates the required components like fuel pumps and ignition systems, which are critical for a successful start. Maintaining this pressure level is crucial for operational reliability and efficiency during the APU's startup process, ensuring it can perform its functions correctly. While other pressures listed may seem reasonable, they do not meet the operational requirements for a normal start.