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MMEL PHILOSOPHY
To introduce an item in the MMEL, the manufacturer must demonstrate first that the consequences of the system failure are no more than minor on the flight. The manufacturer must demonstrate then, that the next critical failure, i.e. the failure that has the most critical effect on aircraft operation when added to the initial failure, maintains the level of safety.
In some cases, this level of safety is maintained provided (o) or (m) procedures are observed. As an example, the aircraft dispatch with one pack inoperative induces a flight level limitation whereas a pack failure in flight does not induce a flight level limitation.
ATA 100 FORMAT
All items/equipment listed in the MEL are identified using the Air Transport Association (ATA)
format. The ATA is the official reference for the classification of aircraft systems and/or functions. The aircraft systems/functions are classified with six digits.
For example, 21-52-01 refers to: 21: ATA 21: Air conditioning 52: Air-cooling system
01: Air conditioning pack
MEL DESCRIPTION
The MEL has four parts:
? ECAM warnings/ MEL entry
? List of items that may be inoperative for dispatch
? Associated operational procedures
? Associated maintenance procedures
 
NORMAL OPERATIONS
PRE START
 
MEL OPERATIONAL USE
The MEL usually applies to revenue flights, and should be consulted before taxi out. If a failure occurs during taxi out, and before the take off roll starts, the decision to continue the flight is subject to pilot judgment and good airmanship. The Captain may consult the MEL before deciding to continue the flight (particularly if the failure has an effect on the takeoff performance).
During preliminary cockpit preparation, the flight crew must press the RCL P/B, for at least 3 s, in order to recall any previous cautions or warnings that have been cleared or cancelled. The flight crew should consult the technical logbook to confirm that the indications are compatible with the MEL.
A failure may occur if a Circuit Breaker (C/B) disengages. When on ground, do not re-engage any fuel pump C/Bs. The flight crew may re-engage any other tripped C/Bs, provided that the action is coordinated with the maintenance team, and the cause of the tripped C/B is identified.
The MEL section 0 is called ECAM Warnings/MEL Entry. The purpose of this section is to help the flight crew to determine the MEL entry point, when an ECAM caution/warning message triggers. The ECAM Warnings/MEL Entry section provides the relationship between the ECAM caution/warnings, and MEL items, if applicable.
If a failed item does not appear in the MEL, it is not possible to dispatch the aircraft. However, items that do not affect the airworthiness of the aircraft, such as galley equipment, entertainment systems,
or passenger convenience items, do not appear in the MEL: The dispatch applicability of these items is not relevant to the MEL.
　
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