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31 - INDICATING/RECORDING SYSTEMS
31-00-00 CFDS: AIRCRAFT DISPATCH
ACCORDING TO MEL
CONTENTS:
ECAM message
ECAM/WARNINGS MMEL Entry
MMEL ATA System
Operational/Maintenance Procedures
TMUCFDB01 LEVEL 2
EFFECTIVITY 31-00-00 Page 1
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MECHANICS / ELECTRICS & AVIONICS COURSE 31 INDICATING/RECORDING SYSTEMS
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CFDS: AIRCRAFT DISPATCH ACCORDING TO MEL
In this module we will use the Master Minimum Equipment
List (MMEL) as if it was an MEL. This module does not
cover the complete use of the MMEL. It is limited to
its use with an ECAM message as an entry point. Note:
the Airbus MMEL is the regular basis allowing operators
to create their own MEL. In reality, the MMEL cannot
in any case be used as an MEL, due to the fact that
it is not related to operational requirements, specific
operations or airlines particular definition.
ECAM MESSAGE
The ECAM message is an entry point for the MMEL.
ECAM/WARNINGS MMEL ENTRY
The ECAM/WARNINGS MMEL ENTRY gives the correspondance
between the ECAM messages and the MMEL item number.
The ECAM WARNINGS / MMEL ENTRY can also directly
indicate a non dispatch condition.
MMEL ATA SYSTEM
The ATA referenced item number gives information about
dispatch conditions:
- * requires inoperative component or function
to be placarded in the cockpit for information.
- (o) implies a crew operational procedure
described in the related MMEL part.
- (m) implies a maintenance procedure described
in the related MMEL part.
A NO DISPATCH condition can also appear here .
OPERATIONAL / MAINTENANCE PROCEDURES
NOTE: the order of * and (or) (o) and (or) (m) , if
present is always the same. But the tasks must
be performed according to the logical order of
the operations. In the example, we begin by the
operational part.
TMUCFDB01-T01 LEVEL 2
EFFECTIVITY 31-00-00 Page 2
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TMUCFDB01-P01 LEVEL 2
CFDS: AIRCRAFT DISPATCH ACCORDING TO MEL
EFFECTIVITY 31-00-00 Page 3
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MECHANICS / ELECTRICS & AVIONICS COURSE 31 INDICATING/RECORDING SYSTEMS
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SELF EXAMINATION
(m) implies:
A - to refer to another MMEL part.
B - a maintenance procedure described in the
MMEL.
C - a mechanical problem
Compared with the Airbus MMEL, an airline MEL can
be:
A - in contradiction.
B - less restrictive
C - more restrictive
TMUCFDB01 LEVEL 2
EFFECTIVITY 31-00-00 Page 4
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MECHANICS / ELECTRICS & AVIONICS COURSE 31 INDICATING/RECORDING SYSTEMS
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31 - INDICATING/RECORDING SYSTEMS
31-32-00 CFDS: TROUBLE SHOOTING PROCEDURE
WITH CFDS
CONTENTS:
Cockpit Effect
PFR
TSM Entry
Fault Isolation Procedure
Self Examination
TMUCFDA01 LEVEL 3
EFFECTIVITY 31-32-00 Page 1
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CFDS: TROUBLE SHOOTING PROCEDURE WITH CFDS
COCKPIT EFFECT
After a malfunction, the crew reports the cockpit
effect in the log book. The fault symptoms, relative
to the cockpit effect, can be as follows:
- a WARNING/MALFUNCTION + CFDS FAULT message
(with possible associated warnings and system
IDENTIFIERS).
- a WARNING/MALFUNCTION alone.
- a CFDS FAULT message alone.
PFR
For the class 1 and 2 failures of CFDS monitored
systems, the Post Flight Report (PFR) permits an access
to the concerned list of faults in the Trouble Shooting
Manual (TSM).
For this purpose, it provides the following
information: ECAM WARNING message (if it exists), FAULT
message with its source, ATA reference and IDENTIFIERS
list.
When the PFR print is not available, this information
can be retrieved through the MCDU (in Normal mode or
Menu mode).
Service Information Letter (SIL) 00-028, made of
"spurious maintenance messages", and the maintenance
knowledge enable the airlines to create a specific
data base to filter the messages to be displayed on
the PFR.
Once loaded into the CFDIU, this maintenance filter
　
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