2.6 MMEL Procedures

2.6.1 General

This section details the procedures to be followed in the organization, approval and publication of the MMEL. The procedures are divided into the following categories; domestically manufactured aircraft, foreign manufactured aircraft, MMEL revisions and MMEL Global Changes.

2.6.2 Domestically Manufactured Aircraft

  1. Draft MMEL

    1. The draft MMEL is to be originated by the manufacturer and should be submitted to Transport Canada as early as possible in the type certification process. Inputs from the aircraft air operator should be made to the originator and, if supported by the manufacturer, should be included in the submission to Transport Canada.

    2. The draft MMEL must be accompanied by appropriate engineering justification.

    3. Applicable operating and maintenance procedures must be supplied in sufficient detail to permit an understanding of each associated MMEL item. Approval of the procedures themselves will not be a part of the MMEL approval process, but rather, the MEL approval process.

    4. For large aircraft, these procedures are normally contained in a manufacturer's document such as a Dispatch Deviation Procedure Guide (DDPG), or a Dispatch Deviation Guide (DDG). For smaller aircraft, where these documents are not available from the manufacturer, the air operator is responsible for developing their own procedures, or using the TC generated MELs, which contain pre-approved maintenance and operations procedures.


  2. Transport Canada Review

    A Transport Canada review of the draft MMEL will be coordinated by the MMEL Review Chairperson. Following review by the appropriate Transport Canada specialists and decisions on individual MMEL items rendered by the MMEL Review Group, the changes required to the draft MMEL will be passed back to the originator.

  3. Approval and Publication

    The originator will incorporate the required changes for approval by the Chief, Aircraft Certification Flight Test. The originator will then publish the final version of the revision or temporary revision and return a sufficient number of hard copies or an acceptable electronic copy to Transport Canada, who will ensure that copies of the approved MMEL are made available to the appropriate Transport Canada personnel as well as industry and air operator personnel via the MMEL/MEL web page. The originator may only distribute copies of the approved MMEL.

2.6.3 Foreign Manufactured Aircraft

  1. Source MMEL

    The MMEL should be either originated by or supported by the manufacturer and approved by the appropriate foreign authority.

    Where the foreign authority has not approved the MMEL, the Transport Canada approval process may be expanded accordingly.

  2. Transport Canada Review


    The MMEL, together with engineering justification and sufficient details of applicable operating and maintenance procedures to permit a full engineering assessment of each MMEL item, must be submitted to Transport Canada as early as possible in the type certification process, and preferably prior to the evaluation visit. A Transport Canada review of the MMEL will be carried out before, during and following the evaluation visit. The review will be coordinated by the chairperson of the MMEL Review Group. The required changes will be incorporated in a TC Supplement to the MMEL.

  3. Approval and Publication of the TC Supplement

    The TC Supplement will be submitted to the Chief, Aircraft Certification Flight Test, for approval and subsequently will be published on the MMEL/MEL web page. A copy will also be sent to the appropriate foreign authority and the aircraft manufacturer.

2.6.4 Revisions to MMELs and TC Supplements

Once a MMEL approval is issued, requests for revisions may be initiated by the air operator or aircraft manufacturer. In any event, the manufacturer's participation is usually required in support of this revision activity.

  1. Approval of Revisions

    All proposed revisions, together with engineering justification and sufficient details of applicable operating and maintenance procedures to permit understanding of each item shall be submitted to the Flight Test Division of the Aircraft Certification Branch of Transport Canada.

  2. Approval Process - Domestically Manufactured Aircraft

    Requests for revisions to a MMEL will be reviewed by the MMEL Review Group. Once the required changes have been approved, they will be passed back to the originator for inclusion in the MMEL and updated on the MMEL/MEL web page.

  3. Approval Process - Foreign Manufactured Aircraft

    Revisions to a foreign MMEL, when issued by the responsible foreign authority, may be used by an air operator upon receipt to amend their MEL, provided that the revisions are not less restrictive than an existing TC Supplement. Foreign MMEL Revisions will be reviewed by Transport Canada and any changes addressed in a revision to the TC Supplement.

  4. MMEL Revision Status

    Regional Offices may determine the current approved revision status of any MMEL and TC Supplements by visiting the MMEL/MEL web page or by contacting the MMEL/MEL coordinator (AARDE) at (613) 952-4416.

2.6.5 MMEL Global Changes

  1. General

    In order to implement revisions to MELs in a timely fashion, changes resulting from major policy decisions and new regulatory requirements which are applicable to all affected MMELs, TC Supplements or MELs may be disseminated as Global Changes (GCs).

    The issuance of a GC grants the air operator the option, in the case of additional relief. or in the case of removal of relief, the obligation to revise a MEL immediately for that specific item in lieu of waiting for a MMEL amendment. It is not anticipated that Global Changes will occur in any great number.

  2. Definitions

    Items that qualify as a GC are generally those items that are required to be installed by a new regulatory requirement, or are MMEL items that are affected by TC policy decisions. Examples are GPWS and CVR which result from regulatory requirements; and Transport Canada MMEL Guidance Book (TCGB) items such as Flap Position Indicator, which reflects a policy decision.

  3. Purpose

    The purpose of GCs is to recind, modify or offer additional MEL relief for items prior to release of the revised MMEL or TC Supplement. The GC system is not intended to replace the normal MMEL revision process and affected MMELs or TC Supplements will incorporate all GCs issued up to the date of each revision.

  4. Procedure

    1. The allowable relief stated in the associated TCGB item will be in the form of a proviso (Column 4 of the MMEL format), and where applicable, should be copied verbatim into the MEL.

    2. Some wording changes may be required to cater to a particular aircraft configuration. The air operator's MEL revision can be approved in the normal manner on the basis that the GC is an approved addendum to the existing MMEL.

    3. GCs will be released with consecutively assigned control numbers (TCGC-1, TCGC-2, etc.) and will reference the appropriate item in the Guidance Book. Both the GCs and the TCGB are available on the MMEL/MEL web page. When a MMEL is revised, the Reasons for Changes List will state which numbered GCs have been incorporated in that revision.
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