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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
A330/A340 FLIGHT CREW TRAINING MANUAL
NORMAL OPERATIONS
PRE START
A330/A340 FLEET NO-020 P 2/14
FCTM 17 JUN 09
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.
In most cases, if the failed item appears in the MEL, the dispatch of the aircraft is authorized,
provided that all dispatch conditions are fulfilled:
• Check the rectification time interval has not expired
• Consider location and, where repair is possible
• (*) Means that an INOP placard is required
• (O) Means that a specific operational procedure or limitation is required (all listed in the MEL
OPERATIONAL PROCEDURES Chapter)
• (M) Means that a specific maintenance procedure is required.
When the MEL requires both maintenance and operational procedures, the maintenance
procedures must be performed before applying the operational procedures.
A330/A340 FLIGHT CREW TRAINING MANUAL
NORMAL OPERATIONS
PRE START
A330/A340 FLEET NO-020 P 3/14
FCTM 17 JUN 09
MMEL symbol
If some items are mandatory for ETOPS dispatch, a mention "ER" (Extended Range) is added
but mandatory items for CATII, CATIII operations, RNP and RVSM may be not mentioned in the
MMEL. However, the MEL should include these requirements.
If it is not the case,
• Mandatory items for CATII/III are available in QRH
• Mandatory items for RVSM are available in FCOM (Refer to FCOM/PRO-SPO-50 REQUIRED
EQUIPMENT/FUNCTIONS FOR RVSM)
• Mandatory items for RNP are available in FCOM (Refer to FCOM/PRO-SPO-51 BRNAV IN
EUROPEAN AIRSPACE)
The ECAM STATUS page displays maintenance messages that are for maintenance purposes
only. Dispatch with maintenance messages displayed on the ECAM STATUS page is permitted
without specific conditions.
SECURED AND TRANSIT STOP
Applicable to: ALL
1 If the last checklist performed by the flight crew is SECURING THE AIRCRAFT C/L, the aircraft is in
SECURED STOP. After a SECURED STOP, the flight crew must perform all items in the Standard
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A330/A340机组训练手册FLIGHT CREW TRAINING MANUAL(25)