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DEPARTMENT OF TRANSPORT MINISTÈRE DES TRANSPORTS
MASTER MINIMUM EQUIPMENT LIST LISTE PRINCIPALE D'ÉQUIPEMENT MINIMAL
Aircraft – Aéronef
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Original Page
BD-100-1A10 Date: Sep 30/03 PRE-1
PREAMBLE
All equipment installed on an aircraft in compliance with the Airworthiness Standards and Operating Rules must be
operative. However, Canadian Aviation Regulations (605.07, 704.07 and 705.07) permit the publication of a
Minimum Equipment List (MEL) where compliance with certain equipment requirements is not necessary in the
interests of safety under all operating conditions. Experience has shown that with the various levels of redundancy
designed into aircraft, operation of every system or installed component may not be necessary when the remaining
operative component can provide the required level of safety.
A Master Minimum Equipment List (MMEL) is developed by Transport Canada, with participation by the aviation
industry, to improve aircraft utilization and thereby provide more convenient and economic air transportation for the
public. The approved MMEL includes those items of equipment related to airworthiness and operating regulations
and other items of equipment Transport Canada finds may be inoperative and yet maintain the required level of
safety by appropriate conditions and limitations; it does not contain obviously required items such as wings, flaps,
and rudders.
The MMEL is the basis for development of individual operator MELs which take into consideration the operator's
particular aircraft equipment configuration and operational conditions. Operator MELs, for administrative control,
may include items not contained in the MMEL; however, relief for administrative control items must be approved. An
operator's MEL may differ in format from the MMEL, but cannot be less restrictive than the MMEL. The individual
operator's MEL, when approved and authorized, permits operation of the aircraft with inoperative equipment.
Equipment not required by the operation being conducted and equipment in excess of the requirements are
included in the MEL with appropriate conditions and limitations. The MEL must not deviate from the Aircraft Flight
Manual Limitations, Emergency Procedures or with Airworthiness Directives. It is important to remember that all
equipment related to the airworthiness and the operating regulations of the aircraft not listed on the MMEL must be
operative.
Suitable conditions and limitations in the form of placards, maintenance procedures, crew operating procedures and
other restrictions as necessary are specified in the MEL to ensure that the required level of safety is maintained.
The MEL is intended to permit operation with inoperative items of equipment for a period of time until repairs can be
accomplished. It is important that repairs be accomplished at the earliest opportunity. In order to maintain the
required level of safety and reliability, the MMEL establishes limitations on the duration of and conditions for
operation with inoperative equipment. The MEL provides for release of the aircraft for flight with inoperative
equipment. When an item of equipment is discovered to be inoperative, it is reported by making an entry in the
Aircraft Maintenance Record/Logbook. The item is then either repaired or may be deferred per the MEL or other
approved means acceptable to Transport Canada prior to further operation. MEL conditions and limitations do not
relieve the operator from determining that the aircraft is in condition for safe operation with items of equipment
inoperative.
Operators are responsible for exercising the necessary operational control to ensure that the required level of safety
is maintained. When operating with multiple inoperative items, the interrelationships between those items and the
effect on aircraft Operation and crew workload must be considered.