What is a Master Minimum Equipment List (MMEL)?

• A. An FAA-approved document listing the minimum operative instruments and equipment required for safe flight for that aircraft type in each authorized operating environment.
• B. A guide for pilot flight planning.
• C. A list of all cockpit instruments regardless of necessity.
• D. A document describing international minimum equipment requirements.

Answer: (A)

The main idea is that the Master Minimum Equipment List is the official document, approved by the aviation authority, that specifies the minimum set of instruments and equipment that must be operable for safe flight on a specific aircraft type in its approved operating environments. It also guides which items may be inoperative and under what conditions the aircraft can be dispatched with them out of service. This makes it the baseline reference for determining acceptable inoperative equipment and it serves as the foundation for the operator’s own MEL. It isn’t a general pilot flight-planning guide, it isn’t a complete list of every cockpit instrument, and it doesn’t describe international minimum equipment requirements.