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indicated that these guidelines have already or will soon be
incorporated into the maintenance documentation. Although they do
not assess the acidity or alkalinity of contaminants, present
guidelines regarding the cleaning and/or repair of wiring account for
the wide pH range of possible contaminants.
5a1 OEM Consider design modification to eliminate non-fire-retardant
materials
Boeing - Specification and use of materials in the manufacture of an
airplane, especially the ability of the material to self-extinguish,
comply with federal regulations at the time of certification. Service
experience or a change in the use of the airplane would be used to
determine whether an original material should be replaced by a
material meeting a different flammability standard
8 April 19 2002 47
Airbus -- The results of the ongoing studies aimed at identifying and
eliminating the use of flammable materials in the flight deck and E/E
bay areas, will determine the Airbus required action.
Lockheed - Materials met the FAA flammability requirements at the
time of design
[COMMENT 1 directed at Boeing] ATSRAC has spent a great deal
of time debating the issues surrounding the treatment of flammable
materials in zones, without reaching a firm conclusion on whether
materials that meet the regulations extant at the time of original
certification should automatically be considered adequately fire
resistant. I do not want to restart that debate here, but I would like to
put down a marker that ATSRAC’s conclusion on that issue should
determine how vigorously design modifications to replace non fire
retardant materials should be pursued. That, in turn, will determine
whether the responses to Recommendation 4.a.2 can be considered
acceptable or not.
[COMMENT 2 directed at Boeing] The ATSRAC is well aware that
materials used in airplane manufacturing comply with federal
regulations at the time of certification. However, service experience,
as illustrated by the intrusive inspections, show that some original
material should be replaced with materials meeting a more current
flammability standard. This is the basis for this series of
recommendations that design modifications be considered to
eliminate non-fire retardant materials. Boeing’s comments are non
responsive to the recommendations.
OWNER REMARKS: OEM P3
Once again, the OEMs support the prompt removal of flammable
contaminants and provide effective procedures for doing so.
However, we do not support the identification and removal of
materials that meet flammability requirements and do not degrade the
operational safety of the airplane.
5a2 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
Airbus -The results of the ongoing studies aimed at identifying and
eliminating the use of flammable materials in the flight deck and E/E
bay areas, will determine the Airbus required action. Contamination
prevention is presently taken into consideration during the design of
the electrical system. Airbus will include in the ESPM guidance and
practices to maintain the design provisions for the prevention of
contamination to wiring
Lockheed - Expanded requirements for the cleaning of and
prevention of contamination will be included in the revision to the
SWPM.
[COMMENT directed at Boeing] Once again contamination only
OWNERS REMARKS: OEM P3
Once again, the OEMs support the prompt removal of flammable
contaminants and provide effective procedures for doing so.
However, we do not support the identification and removal of
8 April 19 2002 48
materials that meet flammability requirements and do not degrade the
operational safety of the airplane
6a1 OEM Accelerate removal of flammable materials from the cockpit and
electronics bay
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 contamination are contained within the specific
AMM chapter applicable to the system or zone under review
Airbus - the results of the ongoing studies aimed at identifying and
eliminating the use of flammable materials in the flight deck and E/E
bay areas, will determine the Airbus required action. Moisture
contamination prevention is presently taken into consideration during
the design of the electrical system. Airbus will include in the ESPM
guidance and practices to maintain the design provisions for the
prevention of moisture contamination to wiring
　
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