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# What Is Certification Maintenance Requirement in Aircraft Maintenance?
- URL: https://www.acmiworld.com/what-is-certification-maintenance-requirement-in-aviation/
- Published: 2026-09-16T12:15:03.000Z
- Updated: 2026-09-16T12:15:03.000Z
- Description: Certification Maintenance Requirement defined for aviation professionals, with its operational or commercial use, document context and related terminology.
- Author: ACMI World
- Tags: Aviation Glossary, Airworthiness & Maintenance, #Import 2026-09-14 15:41

## Meaning in Professional Aviation

A Certification Maintenance Requirement, or CMR, is a maintenance task or interval established during certification to preserve an assumption used in demonstrating system safety.

Aviation Glossary

**Term:** Certification Maintenance Requirement

**Category:** Airworthiness & Maintenance

## How It Is Used

CMRs are controlled requirements and are treated differently from ordinary economic or reliability-driven maintenance tasks.

## Where It Sits in Continuing Airworthiness

Certification Maintenance Requirement forms part of the technical framework used to establish, maintain or document aircraft airworthiness. Applicability depends on aircraft type, authority, approved maintenance data and the operator's maintenance programme.

## Records and Transaction Impact

Technical status must be supported by current records. Buyers, lessors, lenders and MRO organizations normally verify the applicable document, revision, compliance status and remaining maintenance exposure rather than relying on a description alone.

## Related Aviation Topics

Related ACMI World coverage includes [aircraft maintenance reserves](https://www.acmiworld.com/aircraft-maintenance-reserves-explained-what-airlines-and-lessors-actually-fight-about/), [aircraft redelivery conditions](https://www.acmiworld.com/aircraft-redelivery-conditions-explained-the-hidden-economics-at-lease-end/), [pre-purchase inspection findings](https://www.acmiworld.com/prepurchase-inspection-findings-affect-financing/), [aircraft records and resale value](https://www.acmiworld.com/aircraft-records-affect-resale-value/) and [business jet MRO providers](https://www.acmiworld.com/top-10-business-jet-mro-providers-europe/).

CMRs are controlled requirements and are treated differently from ordinary economic or reliability-driven maintenance tasks.

Frequently Asked Questions

## Certification Maintenance Requirement FAQ

What does Certification Maintenance Requirement mean in aviation?

A Certification Maintenance Requirement, or CMR, is a maintenance task or interval established during certification to preserve an assumption used in demonstrating system safety.

Why does Certification Maintenance Requirement matter?

CMRs are controlled requirements and are treated differently from ordinary economic or reliability-driven maintenance tasks.

Where would an aviation professional encounter Certification Maintenance Requirement?

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

Can technical status be accepted without supporting records?

Normally no. Airworthiness and asset-value conclusions depend on records showing applicability, compliance, release status, accumulated life and maintenance history.