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recommendation that we consider design modifications to minimize
the potential for contamination. The presence of contamination may
affect the operation of the system, definitely affects the ability to
assess the condition of airplane wiring, and increases both
unscheduled and schedule maintenance costs. The OEMs presently
evaluate the possibility and effects of sources of contamination and
consider methods of preventing contamination to minimize the
effects on the operation and maintenance of our airplanes. This
policy is eveident in the release of service bulletins recommending
the incorporation of drip shields, heat shields, drains, etc.
4f1 OEM Specify accelerated removal of flammable materials. Establish
guidelines to ensure, and enhance where necessary, the secure
installation of wire bundles
Boeing - Prevention of contamination, and cleaning of noted
contamination on the exterior of wiring will be included in the
Boeing SWPM. In addition, specific unique procedures for the
attachment and prevention of damage to wiring in high vibration
areas is presently provided in the SWPM
Airbus - Prevention of contamination, and cleaning of noted
contamination e.g. lint etc. will be included in the ESPM. Airbus has
specific design rules governing the attachment of wire bundles to
counter the affects of vibration
Lockheed - Requirements for the cleaning of and prevention of
contamination will be included in the revision to the SWPM. The
SWPM contains specific requirements for bundle attachment in high
vibration areas
[COMMENT 1 directed at Boeing] Once again contamination only
[COMMENT 2 directed at Boeing] Not responsive to the
recommendation
OWNER REMARKS: OEM P3
Once again, the OEMs are being responsive to the recommendation
in our support for the prompt removal of flammable contaminants
and 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.
5.1 OEM Specify guidelines that precipitate an invasive inspection or
nondestructive testing of wire bundles exposed to suspected high or
low pH contaminants. Specify guidelines for decontamination
procedures for wire to neutralize the effects of chemically aggressive
contaminants
Boeing- Guidelines for the cleaning and conditional inspection of
contaminated wiring will soon be included in the SWPM and
8 April 19 2002 46
Maintenance Planning Document applicable to the specific model
airplane
Airbus - The ESPM currently gives guidelines for the cleaning,
protection and inspection of wiring. Airbus will review the wire
testing requirements following any recommendations that result from
HWG 9 and also HWG6
Lockheed - LMCO will include additional guidelines, in the SWPM,
that are specific to contamination identification, replacement criteria
of, and cleaning of bundles. Additionally, LMCO will re-issue a SIL
that addresses the cleaning of contaminants from wiring
[COMMENT 1 directed at Boeing] Once again contamination only
[COMMENT 2 directed at Boeing] The only OEM response received
up to now shows the item to be CLOSED and GREEN. However,
the response does not address the first part of the recommendation to
“specify guidelines that precipitate an invasive inspection or
nondestructive testing of wire bundles exposed to suspected high or
low pH contaminants”. Until a response is received on this point, the
item should remain OPEN and YELLOW
[COMMENT 3] Guidelines for cleaning and inspecting contaminated
wiring must be reflective of the intrusive inspection findings. Use of
the qualifier “when unanticipated sources of contamination are
identified during service operation.” Leads one to conclude there
have not already been unanticipated sources. The intrusive inspection
report assures us there have been and there will continue to be
unanticipated contamination. We can anticipate that.
[COMMENT 4 directed at Boeing] While Boeing specifically rejects
the notion of assessing the caustic nature of contaminants, the
recommendation that “the procedures should specify the replacement
of the wiring if the contamination is suspected of entering the wiring
insulation and cannot be removed through conventional cleaning
procedures” is welcome.
OWNER REMARKS: OEM P3
The response to the IIWG recommendation that the OEMs specify
guidelines that would result in the evaluation of wiring thought to be
contaminated by acidic or alkaline materials, and the
recommendation that decontamination procedures be provided,
　
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