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contamination would be valuable.
[COMMENT 2] Is this covered in the FAA planned work on wiring?
[COMMENT 3, also applies to 3e3] This is shown as unassigned and
RED status for each area. I suspect that this is very much an
unknown area to us. Our efforts in Task Group 9 to provide a
maintenance program to keep the wiring free from contamination
would be the preventative measure from any concerns that may arise
in this area. If the working groups are having trouble assigning this
task, I would defer to the FAA EAPAS effort to see if this warrants
research in their view. If FAA does not pick this up, my thoughts
would be to show the preventative actions from Task Group 9 as
closing action on this issue.
8 April 19 2002 39
OWNER REMARKS: FAA P3
MJN – Since receiving the above comments, FAA has taken
ownership of this item. Their action plans above are identified above
3e2 OEM Consider design modification to minimize potential for
contamination
Boeing - Potential sources of contamination of airplane wiring are
identified during the design and development of the airplane, and
appropriate protection in the form of drip or heat shields are included
to minimize the effects of contamination. When unanticipated
sources of contamination are identified during service operation,
additional protection is specified and available to operators through a
service letter or service bulletin. In the case of general protection of
wiring during unrelated maintenance, Boeing will be providing
protection guidelines in an upcoming revision to the SWPM
Airbus - Potential sources of contamination of airplane wiring are
identified during the design and development of the airplane, and
appropriate protection in the form of drip or heat shields are included
to minimize the effects of contamination. If in-service experience
shows that additional protection against contamination is required,
then a design modification will be developed to provide additional
protection. This will be made available to operators thru a service
bulletin. In the case of general protection of wiring during unrelated
maintenance, Airbus will be providing protection guidelines in an
upcoming revision to the ESPM
Lockheed - Sources of contamination are taken into account during
design and are addressed via SB's or SIL's when unforeseen
discrepancies are discovered. LMCO's design standards, currently,
take into consideration the possible loss of multiple critical systems.
Lessons learned and recommendations are to be incorporated into the
SWPM revision.
[COMMENT directed at Boeing] Provide details of the unrelated
maintenance wire protection guidelines and timetable for its
inclusion in the SWPM.
OWNER REMARKS: OEM P3
As unanticipated causes of wiring contamination are addressed on a
case basis, the OEMs believe that this comment relates to the
forthcoming recommendations regarding protection of wiring from
damage and contamination during maintenance. Boeing is presently
evaluating several methods of maintenance protection in various
areas of an airplane. These recommendations must be validated with
operators and repair stations before they are implemented into the
SWPM. At this time a definitive schedule is not available.
The Airbus ESPM currently provides guidelines for the cleaning of
EWIS components (Chapter 20-55-00) and protection (Chapter 20-
54-00) during maintenance. Any HWG7 and HWG9
recommendations will be analyzed and included if appropriate.
In addition, based upon the ATSRAC and FAA recommendations
that we do so, the OEMs are presently implementing notes into all
service bulletins cautioning operators about the importance of
protecting wiring during maintenance. Boeing anticipates release of
service bulletins incorporating this note in mid-2002.
8 April 19 2002 40
Airbus has launched corresponding actions to implement the EAPAS
recommendation to include information in service data on
minimizing wiring contamination during maintenance. A dedicated
procedure is presently under preparation for introduction in the next
available revision of the ESPM. This task will cover the
recommendations and information included in ATA117. We are
investigating also the possibility to introduce this Task in the AMM.
As soon as this specific Task will be available, a cross-reference to
the ESPM or AMM will be made in all relevant Service Bulletins.
LMCO has been adding notes to its SB’s recommending the
utilization ATA Specification 117 guidelines when performing
maintenance in, on or around wiring. All L-1011 operators have
been supplied a copy of the specification and are urged to implement
　
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