What dictates the restrictions for using the APU as a power source?

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The Minimum Equipment List (MEL) dictates the restrictions for using the Auxiliary Power Unit (APU) as a power source. The MEL is a critical document that provides guidance on the operation of an aircraft with inoperative equipment or systems. It specifies which items can be temporarily deferred, under what conditions the aircraft can operate, and outlines specific limitations that must be observed to ensure safe flight operations.

Specifically regarding the APU, the MEL will detail the procedures and conditions under which the APU can be used or must be considered inoperative. This includes aspects such as altitude restrictions, electrical load capabilities, and whether the aircraft can be dispatched with the APU in a certain state. Adhering to the MEL ensures that flight crews operate within the limits of airworthiness and safety standards.

Other documents, such as the Maintenance Manual, Flight Operations Manual, and Aircraft Configuration Guide, serve different purposes. The Maintenance Manual focuses on repair and maintenance procedures rather than operational restrictions. The Flight Operations Manual provides information related to the operational procedures of the aircraft, but may not detail the specific restrictions tied to the APU. The Aircraft Configuration Guide is more about the physical configurations of the aircraft rather than dictating operational limitations.

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