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SWR 111 and resulting TSB inspections of MD-11 fleet.
OWNER REMARKS: OEM P2
The OEMs do not understand the use of the references cited with
regard to wiring protection. Previous statements concerning the
installation and maintenance of wiring protection, as well as the use
of OEM design standards on non-OEM designs, hold considering our
confusion regarding the references. Perhaps clarification is needed.
If the comment refers to the condition whereby moisture or heat
protection was not specified at the time of initial design, operators
should use the guidance provided in the forthcoming enhanced
wiring inspection programs, coupled with the guidance contained
within the OEM standard wiring practices documents to either
identify damage caused from missing drip or heat shields, or identify
the conditions that would necessitate protection.
FOLLOW UP OWNER REMARKS: WG9
WG9 concurs that there is insufficient evidence of problems related
to missing drip or heat shields to warrant a fleet wide campaign to
check for drip shield installation. Determination of type and number
of drip shields per individual aircraft configuration and post delivery
modification would be complex and considered unjustified
3.2 OEM/WG8 Develop a catalog of unacceptable wire bundle configurations
8 April 19 2002 21
Boeing - We have no plans to create and maintain a catalog of
unacceptable wire bundle configurations but will ensure that the
criteria for acceptable wire bundles is clear
Airbus - Airbus includes in the ESPM some examples of
unacceptable wire bundle installations. In addition this subject (photo
library) will be included in the training program.
Lockheed - LMCO has no plans to create and maintain a catalog of
unacceptable bundle configurations. Review of the current
information in the SWPM finds that examples of unacceptable
practices are presented along with the acceptable config's and
practices. SIL 24-10 contains a list of applicable SB's related to
specific wiring problems discovered by LMCO and the L-1011
operators. SIL 24-10 is currently in revision status for the
incorporation of the intrusive and non-intrusive recommendations.
[COMMENT 1] The only OEM response received up to now shows
the item to be CLOSED and GREEN, yet the actual response itself
confirms there are no plans to create and maintain a catalogue of
unacceptable wire bundle configurations. I cannot recall ATSRAC
debating specifically the merits of creating and maintaining a
catalogue of unacceptable wire bundle configurations. However, in
the light of this rejection ATSRAC will need to decide how
important we feel this recommendation was, and whether we are
content that no action is to be taken. For my own part, I believe that
this is not necessary provided that the criteria for acceptable wire
bundles is made sufficiently clear. In addition, TG8 recommends that
the OEM’s construct a graphical database of model and zone specific
wire system faults for instructor and technician training and
knowledge. For completeness, this transfers an action to the OEMs
that needs to be covered by a supplemental OEM comment.
[COMMENT 2] Developing a catalog of unacceptable wire bundle
configurations is a good way to learn from the mistakes of others. It
is self-evident that real problems are more illustrative and instructive
than theoretical ones.
OWNER REMARKS: OEM P2
The OEM responses indicated that we had no plans to create a
readily accessible electronic library of unacceptable wire bundle
configurations. As much of this data already exists with
documentation readily available to the operator or repair station, the
OEMs agreed to provide upon request representative photographs or
line drawings of unacceptable wire bundle configurations for training
purposes.
As far as Airbus Wiring System Training Course is concerned,
representative photos of unacceptable wiring systems and/or
connective devices installation/contamination will be part of the
Airbus training documentation to illustrate typical problems found on
the airplane.
3a2 WG7/OEM (b) Specify nondestructive testing procedures for validating wire
integrity in response to undiagnosed malfunctions of cockpit
electrical equipment
Boeing: (b) Troubleshooting guidance for system anomalies are
contained within the specific Airplane Maintenance Manual chapter
applicable to that system
8 April 19 2002 22
Airbus - (b) The ESPM includes current technology electrical NDT
testing methods. Any new testing methods that arise (e.g. HWG 9
recommendations) will be analyzed and included if appropriate
Lockheed - (b) Troubleshooting practice are contained in the specific
　
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