What is the maximum APU start time?

The maximum APU start time for the C-130J is established to ensure that the Auxiliary Power Unit (APU) operates efficiently and safely during start-up. The specified limit of 35 seconds allows sufficient time for the APU to reach operational speed and stabilize while preventing prolonged attempts that could lead to wear or damage. Ensuring this time frame helps maintain the overall reliability of the APU and avoids excessive fuel consumption or heat buildup during the starting process. This operational protocol is crucial for the effective functioning of the aircraft's systems, contributing to mission readiness and safety.