What should be minimized to enhance APU operational efficiency?

To enhance APU operational efficiency, minimizing unnecessary usage is essential. The Auxiliary Power Unit (APU) is designed to provide power and pneumatic pressure for starting the main engines and supporting systems during ground operations. When the APU runs longer than needed or is used for functions that could be handled by other systems, fuel efficiency decreases, and wear on the unit increases.

Keeping APU usage limited to necessary operations helps ensure that it operates within its efficient parameters, prolongs its operational lifespan, reduces maintenance requirements, and saves on fuel costs. This approach allows the APU to be available when genuinely needed, thereby maximizing its effectiveness and reliability in supporting the aircraft's operations.