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that are redundant to the requirements of the FARs.
27. "Day of Discovery" is the calendar day an
equipment/instrument malfunction was recorded in the aircraft
FEDERAL AVIATION ADMINISTRATION Page: XVI
Revision: 6
MASTER MINIMUM EQUIPMENT LIST Date: 01/31/1995
G-IV
Definitions
maintenance log and or record. This day is excluded from the
calendar days or flight days specified in the MMEL for the
repair of an inoperative item of equipment. This provision is
applicable to all MMEL items, i.e., categories "A, B, C, and
D."
FEDERAL AVIATION ADMINISTRATION Page: XVII
Revision: 2
MASTER MINIMUM EQUIPMENT LIST Date: 06/14/1989
G-IV
Preamble
(Effective 6/14/89)
The following is applicable for authorized certificate holders operating
under Federal Aviation Regulations (FAR) Parts 121, 125, 129, 135: The
FAR require that all equipment installed on an aircraft in compliance
with the Airworthiness Standards and the Operating Rules must be
operative. However, the Rules also 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
equipment can provide an acceptable level of safety. A Master Minimum
Equipment List (MMEL) is developed by the FAA, with participation by the
aviation industry, to improve aircraft utilization and thereby provide
more convenient and economic air transportation for the public. The FAA
approved MMEL includes those items of equipment related to airworthiness
and operating regulations and other items of equipment which the
Administrator finds may be inoperative and yet maintain an acceptable
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 by the Administrator. 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 FAR 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.
FEDERAL AVIATION ADMINISTRATION Page: XVIII
Revision: 2
MASTER MINIMUM EQUIPMENT LIST Date: 06/14/1989
G-IV
Preamble
(Effective 6/14/89)
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 an acceptable 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 an acceptable 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 as prescribed by FAR.
The item is then either repaired or may be deferred per the MEL or other
approved means acceptable to the Administrator 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.
When these requirements are met, an Airworthiness Release, Aircraft
Maintenance Record/Logbook entry, or other approved documentation is
issued as prescribed by FAR. Such documentation is required prior to
　
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