What is the maximum altitude that the APU GEN can be utilized?

The maximum altitude at which the APU (Auxiliary Power Unit) generator can be utilized is 30,000 feet. This limit is established due to the operational characteristics of the APU at higher altitudes. At altitudes above this threshold, the performance and efficiency of the APU can decrease, impacting its ability to generate sufficient power and maintain appropriate operating conditions.

Understanding the operational limitations of the APU is crucial for safe flight operations, as exceeding the specified altitude can lead to potential power loss or operational failures. Therefore, adherence to the 30,000-foot altitude limit ensures that the APU can function effectively and provide the necessary support for onboard systems.