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considers the potential for loss of multiple functions to the extent that continued safe
operation may not be possible.
Example 1
The modification installs new Terrain Awareness Warning System wiring
adjacent to existing wiring associated with primary flight instrumentation. This
modification could increase the potential effect of a fire in the zone by the adding
TAWS to the multiple systems contained within a single wire bundle that could be
lost due to a localized arc or fire. Thus the answer to the question is “YES.”
Example 2
The modification replaces existing analog flight instrumentation with new digital
displays that include replacement of a single, large, multi-function wire bundle
with separately routed wire bundles for the Pilot and Co-Pilot flight displays. This
modification reduces the potential effect of a fire in the zone by providing greater
separation of wiring for primary flight instruments. In this example, the answer
is “YES,” with the possibility that re-application of EZAP to the entire zone may
determine that GVI rather than DET is adequate for the wiring in the zone after
modification.
• Frequency of maintenance access to the zone – Does the modification change the
frequency of maintenance access to the zone? More frequent access to a zone
offers greater potential for accidental damage to wiring in the zone. To properly
answer this question, the Analyst should collaborate with the TC Holder and current
operators to determine typical frequency of maintenance access to the zone.
Example 1
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix C: Determination If Service Bulletin Modification or STC Requires EZAP 45
The modification installs a new cargo door system that includes installation
of a hydraulic accumulator. The SB instructions or STC Instructions for
Continued Airworthiness (required by Part 25, Appendix H), include a
servicing of the accumulator at 2A interval. The TC Holder (or Operator)
maintenance program accesses the zone at 1C interval. In this case, the
answer is “YES” as the modification does change the frequency of
maintenance access to the zone.
If the modification significantly affects any of the zone attributes noted, re-analysis of the
zone is required and the analysis continues to Step 9. If the modification does not affect
these attributes, the analysis continues to Step 6.
Step 6. “Was a task included in SB or STC ICAW in Box 4 above?”
This question is asked to determine whether special reporting for STCs is required. Future
rule changes may require special reporting for STCs approved prior to a specified date to
document compliance with EZAP requirements when no tasks are identified. If a task was
identified in Step 4, the reporting requirement is satisfied by inclusion of the task in the STC
ICAW. This requirement does not apply to SBs.
Step 7. “No further action.”
Analysis is complete and no special reporting is required.
Step 8. “Comply with special reporting requirement for STCs if EZAP not required.”
If the answer to Step 6 is ‘NO’, future rulemaking may require special reporting to TCCA
and operators for STCs approved prior to a specified date to document compliance with
EZAP requirements when no tasks are identified.
Step 9. “EZAP must be accomplished on entire zone with consideration of the SB or STC
installed.”
At this point, the analyst has determined that the modification could have affected certain
zone attributes that may alter the outcome of the EZAP conducted by the TC Holder without
regard to the presence of the modification. The full EZAP must be applied to the zone with
consideration of the modification present.
It is possible that application of the EZAP may result in no new tasks identified. Upon
completion of the EZAP, future rule changes may require special reporting for STCs approved
prior to a specified date to document compliance with EZAP requirements when no tasks are
identified.
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix D. Electrical Wiring Interconnection System 46
APPENDIX D. ELECTRICAL WIRING INTERCONNECTION SYSTEM
As stated in the definitions section of this TP “Electrical Wiring Interconnection System”
(EWIS) is defined as follows:
“An electrical connection between two or more points including the associated
termination devices (e.g., connectors, terminal blocks, splices) and the necessary
means for its installation and identification.”
The definition of “EWIS” includes the following:
　
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