Which statement describes proper readiness indicators for the APU on the ground?

Which statement describes proper readiness indicators for the APU on the ground?

• A. Electrical output within spec, N2 within limits, EGT within limits, and no fault indications.
• B. Visual exterior condition is the sole readiness indicator.
• C. APU readiness requires full throttle operation.
• D. A fault code present indicates readiness.

Answer: (A)

On the ground, readiness means the APU is actually operating within normal parameters and not signaling problems. This is shown by electrical output within specification, N2 speed within approved limits, and exhaust gas temperature within limits, along with no fault indications. Together, these confirm the APU can reliably supply power and operate safely. Visual exterior condition can’t prove internal performance, full-throttle operation isn’t required to declare readiness, and a fault code would indicate a fault rather than readiness.

On the ground, readiness means the APU is actually operating within normal parameters and not signaling problems. This is shown by electrical output within specification, N2 speed within approved limits, and exhaust gas temperature within limits, along with no fault indications. Together, these confirm the APU can reliably supply power and operate safely. Visual exterior condition can’t prove internal performance, full-throttle operation isn’t required to declare readiness, and a fault code would indicate a fault rather than readiness.