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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
8 April 19 2002 50
Lockheed - Expanded requirements for the cleaning of and
prevention of contamination will be included in the revision to the
SWPM.
[COMMENT directed at Boeing] But what have you learned?
OWNER REMARKS: OEM P3
The OEMs were aware of the continued potential for contamination
throughout the life of the airplane, a fact that was reinforced by the
results of the IIWG. The OEMs learned that the prevention and
prompt removal of contamination on wiring were not being
emphasized by the operators as routine maintenance of the wiring.
6d1 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] 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.
OWNER REMARKS: OEM P3
The response stated that “…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…” The fact that the OEMs have already
released such documents to provide protection from sources of
contamination on in-service airplanes not anticipated during the
8 April 19 2002 51
design of the airplane, would contradict the conclusion that there
have not already been unanticipated sources.
GR5 FAA Excessive wire heating presents the risk of electrical fire or ignition
of surrounding combustible materials. High resistance interconnections
where electrical heating is sufficient to damage the wire
insulation are typically detected by visual inspection for embrittled,
charred or missing insulation. However, the relationship of
observable thermal damage to wire hot enough to hazard the aircraft
is still unknown. It is recommended that the FAA conduct research
to determine how best to manage this issue
AAR-433 - This is not currently part of the FAA Electrical Systems
Research Program
[COMMENT] I do not recall any of the activities in the extensive
FAA R&T program which address this. Did I miss it?
OWNER REMARKS: FAA P3
8 April 19 2002 52
[COMMENT 1]
a. The determination was made that all wires are considered critical, but yet the
Intrusive Inspection Group realized there was a definite need to categorize/separate power
wires from signal wires. "Stray currents which effect the functionality of those systems".
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