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# What Is Master Minimum Equipment List in Aviation?
- URL: https://www.acmiworld.com/what-is-master-minimum-equipment-list-in-aviation/
- Published: 2026-09-14T16:35:50.000Z
- Updated: 2026-09-14T16:35:50.000Z
- Description: Master Minimum Equipment List defined for aviation professionals, with its operational or commercial use, document context and related terminology.
- Author: ACMI World
- Tags: Aviation Glossary, Airline Operations & Navigation, #Import 2026-09-14 15:41

## Technical Meaning and Practical Use

A Master Minimum Equipment List, or MMEL, is the aircraft-type reference document identifying equipment that may be inoperative under specified conditions without making the aircraft automatically unairworthy for dispatch.

Aviation Glossary

**Term:** Master Minimum Equipment List

**Category:** Airline Operations & Navigation

## Operational Effect

Operators use it as the basis for their own approved MEL rather than operating directly from the MMEL.

## How It Is Used in Flight Operations

Master Minimum Equipment List is used within dispatch, flight planning, crew procedures, aircraft approvals or air traffic operations depending on the subject. Operators must apply the version and approval basis recognized by the relevant aviation authority.

## Approval and Dispatch Considerations

Equipment capability alone may not be sufficient. Operator approval, crew qualification, maintenance status, database currency, route authorization and company procedures can all affect whether the capability may be used on a specific flight.

## Related Aviation Topics

Related ACMI World coverage includes [structuring an ACMI RFP](https://www.acmiworld.com/how-to-structure-an-acmi-rfp-for-short-term-airline-capacity/), [ACMI lease pricing](https://www.acmiworld.com/acmi-lease-pricing-explained-what-airlines-actually-pay-for-capacity/), [benefits of ACMI leasing](https://www.acmiworld.com/benefits-of-acmi-leasing-for-airlines/), [international charter compliance](https://www.acmiworld.com/international-charter-compliance-guide-for-buyers/) and [wet lease versus dry lease](https://www.acmiworld.com/wet-lease-vs-dry-lease-explained-key-differences-for-aircraft-operators/).

Operators use it as the basis for their own approved MEL rather than operating directly from the MMEL.

Frequently Asked Questions

## Master Minimum Equipment List FAQ

What does Master Minimum Equipment List mean in aviation?

A Master Minimum Equipment List, or MMEL, is the aircraft-type reference document identifying equipment that may be inoperative under specified conditions without making the aircraft automatically unairworthy for dispatch.

Why does Master Minimum Equipment List matter?

Operators use it as the basis for their own approved MEL rather than operating directly from the MMEL.

Where would an aviation professional encounter Master Minimum Equipment List?

It is commonly encountered in airline operations & navigation documents, procedures, calculations or operating discussions where the underlying technical or commercial issue is relevant.

Does installed equipment automatically authorize the operation?

No. Many capabilities also require operator approval, current maintenance status, crew qualification and procedures accepted by the relevant authority.