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MMEL indicates that a specific maintenance procedure must be accomplished before beginning operation with the listed item of equipment inoperative.

Some operators of aircraft, based on the kind of operation or size and type of aircraft are required to have a Minimum Equipment List (MEL) in order to operate the aircraft with inoperative instruments or equipment.

Master Minimum Equipment List (MMEL): A master list of items on an aircraft that are allowed to be inoperative under specific conditions without impacting the safety of flight. The MMEL is established by the aircraft manufacturer and approved by the national aviation authority.

The MEL is similar to the MMEL. Their difference is that the MEL is formulated for a particular operator and a certain aircraft or a few aircraft, whereas the MMEL is formulated for all aircrafts of this type.

Part (d)(2) states that even if your aircraft is not required to have a MEL, the inoperative piece of equipment must not be required by the manufacturer to be serviceable, as indicated in the POH. This effectively means that if the aircraft has an MMEL, the MMEL must be followed, even if a MEL is not legally required.

This Master Minimum Equipment List (MMEL) is issued by [Supplemental/Type Certificate Holder name] at the above revision and is approved by the European Aviation Safety Agency (EASA) as the basis for the preparation and approval of individual operator's Minimum Equipment List (MEL) for aircraft of this model, as ...

The master minimum equipment list (MMEL) is a list established for a particular aircraft type by the organisation responsible for the type design with the approval of the State of Design which identifies items which individually may be unserviceable at the commencement of a flight.

The MEL is similar to the MMEL. Their difference is that the MEL is formulated for a particular operator and a certain aircraft or a few aircraft, whereas the MMEL is formulated for all aircrafts of this type.