What is the minimum required bleed air pressure when operating the APU?

The minimum required bleed air pressure when operating the Auxiliary Power Unit (APU) is 30 psi. This pressure is critical because it ensures that the APU can provide adequate and reliable airflow to start engines and perform other functions, such as powering aircraft systems while on the ground. When the bleed air pressure is maintained at the correct level, it optimizes the performance and efficiency of the APU, ensuring it operates within safe parameters.

Maintaining proper bleed air pressure is essential for safe operations, as inadequate pressure can lead to insufficient airflow, causing the APU to potentially stall or fail to provide the necessary power for starting engines or auxiliary systems. Therefore, knowing and adhering to this requirement is crucial for effective aircraft management and operational readiness.