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guidelines provided by the OEMs indicate that they already account
for loss of multiple critical functions as a result of a common mode
failure, so no changes were necessary to the guidelines to comply
with the recommendation
Any new requirements which may arise from HWG 6 Sub-tasks 6.7
(Wire Separation Requirements), 6.6 (Wire System Safety
Assessment Requirements) and 6.8 (Wiring Identification
Requirements) will be analyzed and documentation will be updated if
appropriate.
4b5 FAA Research and develop fire retarding and suppressing materials and
systems suitable for this situation
Currently, no incorporation plan from the FAA (MJN)
[COMMENT 1] As yet, this recommendation has no owner. Owing
to the nature of the task I believe that it would best be achieved
through an FAA R&D program
[COMMENT 2] I think I understood this is being pursued by the
FAA Fire research centre but is it expected that work will be
stimulated in industry to develop better materials? If current
materials meet the standards there is no incentive to do so
[COMMENT 3] This is another area where it is not clear to me what
the recommendation actually targets. My best guess would be that
we are recommending development of better wire insulation material
that is both resistant to cracking and more fire resistant? If so, this
looks like a tasking for the wire industry. It may be better to refer the
recommendation back to the Intrusive Inspection WG for
clarification. By the coding of Red and the????? shown, it appears
our working group chairs are not sure on this.
8 April 19 2002 44
OWNER REMARKS: FAA P3
MJN – Since receiving these comments, the FAA have taken
ownership of this item.
4c2 OEM Accelerate removal of flammable materials
Boeing - Prevention of contamination, and cleaning of noted
contamination on the exterior of wiring will be included in the
Boeing SWPM. Additional guidelines for the removal of
accumulations of flammable materials are contained within the
specific AMM chapter applicable to the system or zone under review
Airbus - Prevention of contamination, and cleaning of noted
contamination on the exterior of wiring is included in the ESPM. The
results of the ongoing studies aimed at identifying and eliminating
the use of flammable materials, will determine the Airbus required
action
Lockheed - Materials met the current FAA flammability
requirements at the time of design. It is LMCO's intent to provide
additional guidelines for cleaning and prevention of flammable
contamination in the revision of the SWPM
[COMMENT directed at Boeing] Once again contamination only
OWNER REMARKS: OEM P3
Once again, the OEMs support the prompt removal of flammable
contaminants provide effective procedures for doing so. However,
we do not support the identification and removal of materials which
meet flammability requirements and do not degrade the operational
safety of the airplane.
4e2 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 - Expanded requirements for the cleaning of and
prevention of contamination will be included in the revision to the
SWPM
8 April 19 2002 45
[COMMENT 1 directed at Boeing] Status quo
[COMMENT 2 directed at Boeing] Not responsive to the
recommendation
OWNER REMARKS: OEM P3
The OEMs disagree that we are not responsive to the
　
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