What is the normal operating speed range (RPM) for the APU on the C-130J?

The normal operating speed range for the Auxiliary Power Unit (APU) on the C-130J is between 95% and 105% RPM. This range is designed to ensure that the APU operates efficiently and reliably, providing the necessary electrical power and pneumatic pressure for aircraft systems during ground operations or when the main engines are not running.

Operating the APU within this range allows for optimal performance, ensuring stability and preventing the risk of mechanical stress or failure that may occur if the RPM falls below or exceeds these specified limits. The APU is a critical component, and maintaining the correct RPM is essential for the overall safety and functionality of the aircraft systems it supports.