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Due to their high current potential and ease of identification (size),
presence of feeder cables should be specifically noted in the list of
details in a zone and considered for Detailed Inspection based on
zone environment and frequency of maintenance access to the zone
where potential damage could occur. Use of non-destructive testing
is insufficiently mature to apply on a scheduled basis. Initially, new
NDT methods would likely be used to support trouble-shooting
activities which will provide the necessary experience to allow
assessment of their use in scheduled maintenance
[COMMENT] From the various comments in this section, the
quantity of Service Actions aimed at the power feeder cables
reviewed as a part of Task 2’s tasking, and NWA’s experience with
this system, I concur that this system warrants special review.
8 April 19 2002 10
However, I don’t know that I see a system review recommendation
from the Task 9 WG comments. WG9 indicates power feeder cable
elements should be specifically listed when doing EZAP analysis,
however I wonder if a specific review of the entire system for
maintenance actions would yield a better maintenance program for
this area of concern. Specifically, items such as periodic torquing of
terminal lugs, functional tests of cross tie lock out systems, power
transfer tests may need review. EZAP focuses on wiring system
components in the zone and will address some of the concerns with
this system but many of the functional checks assigned and those
intervals may remain as is. Should this important system have
another assessment of overall maintenance tasks done from a systems
approach knowing the criticality of defects in this system?
OWNER REMARKS: WG9 P1
T3WG and T9WG were not tasked to consider or identify particular
systems that may benefit from an overall review of the entire system
for maintenance actions. EZAP was developed as an enhancement to
existing Zonal Analysis methods in response to the need to address
wiring discrepancies which are not normally considered in the loss of
function analysis performed at the system level. However, T9WG
agrees that power feeder wiring should be specifically identified
when listing the “Details of the Zone” when accomplishing the
EZAP due to its potential for high energy release as a result of
accidental or environmental damage. This ensures that the analyst
will consider environment and potential for accidental damage to this
wiring in the task selection portion of the EZAP. Normally, tasks
such as re-torque terminal lugs on particular electrical components
and functional tests are derived from ATA specific systems analysis
such as the MSG3 Systems/Power plant Analysis procedure. are
derived from service experience or inspection findings. EZAP should
be effective in the selection of visual inspections (either GVI or DET
as warranted by zone size, density, and potential impact of a
localized fire) which should detect evidence of an overheat condition
on high power terminals. Such a finding should cause an operator to
consider additional tasking to prevent the overheat condition, such as
periodic re-torque of the terminals.
4a1 WG7 Specify accelerated removal of flammable material
WG7 - General and conditional cleaning procedures will be included
in the SWPM/ESPM minimum content
[COMMENT] Task Group 7 has not addressed the recommendation.
Operators have several years to remove aluminized Mylar insulation
materials. The recommendation was that operators prioritize, where
possible, removal of this material in cockpits and electronics bays
OWNER REMARKS: WG7 P1
HWG7 was tasked with defining the minimum content and common
format to be used for electrical systems standard wiring practices
manuals. The recommendation that HWG7 consider the inclusion of
accelerated removal of flammable materials prompted the response
that cleaning procedures will be included as minimum content.
The removal of flammable, non-fire retardant or contaminated
materials unrelated to wiring, such as metalized Mylar, is beyond the
scope of the electrical systems standard wiring practices manuals.
8 April 19 2002 11
4b3 WG6 Consider design modification to enhance wire separation
requirements for this specific situation. Consider local design
modification to replace non-fire-retardant materials
WG6 - Task Group 6 is considering development of new Advisory
Materials for this item. The new AC material will be included in the
revised AC for wiring
[COMMENT 1] Their idea is the present SWPM
Clarification from commenter - I can see some of the confusion
　
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