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recommendations in case of new wiring installation after delivery to
the aircraft.
OEM design practices, and the resulting guidance used to maintain
those designs, are proprietary to the OEM. The requirement to use
these practices and procedures for designs created by entities other
than the OEM is inappropriate. Operators, repair houses and STC
applicants could consult the OEM guidelines in developing their
after-delivery modifications, or develop their own.
2.6 OEM Develop diagnostic technologies and techniques to identify and
prevent the development of high resistance interconnects
Boeing - Boeing has no plans to develop additional technologies or
techniques to prevent or identify high resistance interconnects
Airbus - Airbus has no plans to develop additional technologies or
techniques to prevent or identify high resistance interconnects.
Airbus feels that the current visual inspections guidelines presently
provided in the ESPM plus any additional inspection requirements
recommended by HWG 9 will be sufficient to detect this type of
event
Lockheed - Common wiring practices in the SWPM will prevent the
development of high resistance interconnects. LMCO has no plans
for the development of new technologies or techniques for the
prevention of high resistance interconnects
[COMMENT directed at Boeing] The only OEM response received
up to now shows the item to be CLOSED and GREEN, yet the actual
response itself confirms there are no plans to develop additional
technologies or techniques to prevent or identify high resistance
interconnects. I cannot recall ATSRAC debating specifically the
merits of this particular course of action. However, in the light of
this rejection ATSRAC will need to decide how important we feel
this recommendation was, and whether we are content that no action
is to be taken. For my own part, I believe that proper installation and
8 April 19 2002 29
environmental protection of connections and terminal blocks will
prevent development of high resistance interconnects. In addition,
visual indicators, such as discoloration and surface corrosion can be
used as pointers towards the development of high resistance
interconnect.
OWNER REMARKS: OEM P3
The OEMs agree with the commenter that the proper installation of
connections, terminal blocks, splices, etc. will prevent development
of high resistance interconnects. The development of diagnostic
technologies and techniques to either identify the potential for or
development of high-resistance interconnects is not necessary given
that visual indicators, such as discoloration, apparent during detailed
visual inspections will identify high resistance interconnects. System
monitoring will identify system effects as a result of high resistance
interconnects.
However, the OEMs are actively either developing or evaluating
wiring test equipment intended to determine the condition of wiring.
The need to assess the development of high-resistance interconnects
will be accounted for in this evaluation.
2a2 OEM Investigate periodic, selective inspection and nondestructive testing
of cockpit and electronics bay wiring
Boeing - Boeing presently conducts periodic inspections of airplanes,
including the E/E bay and flight deck. Selective inspections, as a
result of in-service experience, are evaluated on a case-by-case basis
Airbus - Airbus currently conducts periodic inspections of airplane
wiring, including the avionics bay and flight deck. The information
collected as a result of these inspections is used to improve and
update, as required, the current electrical design, technology of
electrical components and technical design directives
Lockheed - LMCO addresses wiring concerns utilizing Service
Information Letter (SIL) 24-10. This SIL is updated periodically to
include new information and concerns received. Recurring wiring
related problems are addressed via Service Bulletins. Inspections and
lab testing of in service wiring is not presently done due to the
reduction of resources allocated for the L-1011. On aircraft wiring
issues are addressed via SILs, Customer Technical Support and the
Engineering Support staff
[COMMENT directed at Boeing] The response indicates an
appropriate course of action whose adequacy will depend on the
frequency and intensity of the inspections. If these inspections are no
more frequent and no more intensive than those performed prior to
our awareness of wiring issues, then the response is not adequate.
OWNER REMARKS: OEM P3
The initial recommendation was interpreted as, and the OEM
response applied to, the concept of periodic sampling of the E/E bay
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