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AC/ACJ for EWIS
WG7 - General and conditional wiring protection and cleaning
procedures will be included in the SWPM/ESPM minimum content
[COMMENT, also applies to 3a2] While we have struggled to get
ATA/operator participation to the Task 7 working group, I am
concerned cleaning practices may be developed independent of the
end user. Cleaning specifications need to have a thorough review
and trial application with both OEM maintainability engineers and
operator engineering staff. We need to assess both the advantages of
a clean wire and the risks associated with damage from cleaning
methods. I would ask Task 7 WG advise how they would validate
cleaning practices they intend to put into the SWPM and I could
work on operator participation in this phase of Task 7’s effort
OWNER REMARKS: WG7 P1
HWG7 was tasked with defining the minimum content to be
contained within a standard wiring practices manual. Although
wiring cleaning and protection procedures were selected by HWG7
8 April 19 2002 7
as minimum content, developing, validating and presenting those
procedures remains the responsibility of the OEM or operator.
Supplemental OEM remarks-OEMs have not previously included in
our standard wiring practices documents specific procedures for the
cleaning and protection during maintenance of wiring for various
reasons. One significant reason is that operators were expected to
develop airline-specific procedures based upon their unique
expertise. Because the OEMs are now incorporating recommended
procedures for the cleaning and protection of wiring during
maintenance it is prudent that these procedures not conflict with
those developed by and in use at airlines. We are developing these
procedures in conjunction with airlines to ensure that our procedures
are clear, concise and do not compromise existing procedures. In
addition, HWG7 recommendations will be evaluated and addressed
accordingly.
The Airbus ESPM currently provides guidelines for the cleaning of
electrical components (Chapter 20-55-00) and protection (Chapter
20-54-00) during maintenance.
3a2 WG7 (a) Specify situation-specific standards to ensure wire bundles are
properly protected and cleaned based on OEM approved practice
WG7 - (a) General and conditional wiring protection and cleaning
procedures will be included in the SWPM/ESPM minimum content
[COMMENT] The findings of the intrusive inspection team make it
clear that compliance with existing airplane maintenance manuals for
protection and cleaning of wires is neither preventive nor sufficient
to insure wire integrity
OWNER REMARKS: WG7 P1
HWG7 was tasked with defining the minimum content to be
contained within a standard wiring practices manual. Although
wiring cleaning and protection procedures were selected by HWG7
as minimum content, developing, validating and presenting those
procedures remains the responsibility of the OEM or operator.
Supplemental OEM Remarks- The OEMs disagree that the findings
of the IIWG question the adequacy of protection and cleaning
procedures provided in the airplane maintenance documentation.
The stated conclusion from the IIWG report indicates that visual
inspection is an effective tool for identifying some types of wire
damage, but ineffective in detecting others. The IIWG did not review
the procedures contained with the airline’s maintenance
documentation or whether those procedures had been in use on the
airplane under inspection.
The OEMs reviewed the results of the intrusive and non-intrusive
inspections, reviewed our procedures, limitations and guidelines with
those results in mind, and believe that proper use of the existing
recommendations would have prevented or mitigated the effects of
wiring damage. Please note that neither the OEM recommendations
nor the ATA Specification 117 included procedures for the cleaning
and protection of wiring during maintenance prior to either the
intrusive or non-intrusive inspections.
3b1 (a) WG7/8/9 (a) Develop situation specific guidance to ensure the proper attention
8 April 19 2002 8
(b) WG6/OEM to protection and cleaning wire bundles. (b) Develop guidance on the
separation of wire bundles from non-fire-retardant materials.
WG9 - (a) MSG3, Rev 2001.1 EZAP logic includes a determination
if accumulation of combustible material likely in a zone, and
selection of task(s) to prevent significant accumulation of
combustible material.
[COMMENT] Or installed combustibles
OWNER REMARKS: WG9 P1
EZAP was not designed or intended to identify tasks to mitigate the
risk posed by the presence of properly certified, uncontaminated
　
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