MEL Customisation: 6 Important Steps

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Aircraft safety is a top priority in the aviation industry, and the Minimum Equipment List (MEL) is a critical tool for ensuring safe operations. While Master Minimum Equipment Lists (MMELs) provide a baseline, aircraft are unique and may require customisations to address specific configurations and operational needs. Customising the MEL can optimise safety, efficiency, and compliance with regulations. In this article, we will explore six important steps for MEL customisation, empowering aviation professionals to enhance safety standards.

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#1: Assessing Aircraft Configuration

The first step in MEL customisation is understanding the unique configuration of the aircraft. This includes identifying installed equipment, modifications and any Supplemental Type Certificates (STCs) that might affect the MEL. Collaborating with continuing airworthiness personnel (CAMO) is essential to gather accurate information about the aircraft’s specific setup.

#2: Identifying Applicable Regulations

Regulatory requirements play a vital role in MEL customisation. Aviation professionals must thoroughly analyse relevant regulations and airworthiness directives that impact the aircraft’s equipment and operations. Understanding these requirements ensures that the customised MEL remains compliant and meets safety standards set by aviation authorities.

#3: Determining Operational Requirements

Customising the MEL involves considering the operational needs of the aircraft. Factors like intended flight routes, the type of missions conducted, and operational restrictions influence MEL customisations. Collaboration with flight operations teams is key to comprehensively assessing the operational requirements for a safe and efficient MEL.

#4: Developing Alleviating Procedures

The heart of MEL customisation lies in developing alleviating procedures for the identified MEL items based on the Master Minimum Equipment List (MMEL) and any associated maintenance and operational procedures recommended by the aircraft manufacturer. MMELs within EASA are standardised in accordance with the CS-MMEL (this article explores the role of the CS-MMEL). These procedures should outline step-by-step actions to be taken by flight crews and maintenance personnel when facing specific equipment failures. The procedures should prioritise safety while ensuring compliance with regulations.

#5: Seeking Regulatory Approval

Once the customised MEL is developed, seeking regulatory approval is crucial. Collaboration with the appropriate aviation authorities is necessary to ensure that the customisations meet safety standards and comply with regulations. The approval process may involve submitting documentation, addressing inquiries, and making necessary revisions.

#6: Continuous Review and Updates

Customised MELs are not static documents. Regular review and updates are necessary to address changes in aircraft configuration, regulations, and operational requirements. Aviation professionals should adopt a proactive approach, continuously monitoring and refining the MEL to ensure it remains effective and up to date.

Customising the Minimum Equipment List (MEL) is a vital process to enhance aircraft safety, efficiency, and compliance. By following these six important steps, aviation professionals can create personalised MELs that cater to the unique configurations and operational needs of their aircraft. Needless to say, MEL training is very important, specifically training on the customisation process itself. To unlock your potential and excel in MEL customisation, consider enrolling in’s online course. Gain valuable insights, expert guidance, and practical knowledge to create customised MELs that prioritise safety and optimise aircraft operations. To learn more or enroll to the online course visit: – Minimum Equipment List (MEL) Customisation Course.

“Minimum Equipment List (MEL) Customisation” Course

236.44 279.00

This course will give you a deep understanding of the regulation concerning Minimum Equipment List (MEL)  and will guide you through the process of customisation, approval and use of  MELs.


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