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system might be affected by an arc from the wiring installed or routed by the modification.
If the answer to Step 2 is 'NO', bypass Steps 3 and 4 and proceed to Step 5.
If the answer is 'YES', proceed to Step 3.
Step 3. “Identify DET for wiring installed or routed by the modification in area of close
proximity to flight controls. Assign interval based on Appendix C, Figure 2.”
Wiring installed or routed within 2 inches / 50 mm of both primary and backup flight
controls will require a DET. The TC or STC Holder must identify the specific wiring for
DET and use the worksheet in Figure 2 to determine the required interval. The DET and
interval must be added to the SB instructions or the STC Instructions for Continued
Airworthiness in accordance with CAR 525, Appendix H.
Step 4. “Include DET and Interval in Service Bulletin or STC Instructions for Continued
Airworthiness.”
The DET and interval identified in Step 3 must be added to the SB instructions or the STC
Instructions for Continued Airworthiness.
After completion of Step 3 (and 4, if applicable), continue the analysis and proceed to Step 5.
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix C: Determination If Service Bulletin Modification or STC Requires EZAP 43
Step 5. “Does the SB or STC modification affect key zone attributes?”
This step consists of multiple questions to determine if the modification has affected certain
zone attributes that could change the outcome of the EZAP applied to the zone without the
modification installed. A ‘YES’ answer to any of the questions will require reapplication of
EZAP to the entire zone.
Does it introduce the potential for presence of combustible materials in the zone for the first time?
This question assesses whether the modification could, by design, or failure of a single
item, introduce combustible materials onto or adjacent to wiring in the zone for the first
time. If yes, the full EZAP must be accomplished on the zone.
Example 1:
The modification installs a “tee” fitting in a fuel pressure line to support a new
fuel pressure indication system. Prior to the modification, the fuel line transited
the zone with no connections or couplings in the zone that could be potential leak
sources, and the zone had no other potential sources of combustible materials. In
this example, the answer to the question would be 'YES’ – the newly installed
“tee” fitting introduces a potential source of combustible materials in the zone for
the first time.
Example 2:
The modification installs a “tee” fitting in a fuel pressure line to support a new
fuel pressure indication system. The “tee” is installed at an existing coupling in
the line. In this example, the answer to the question would be 'NO’ because the
potential for a fuel leak already existed at the fuel line connection already present
in the zone.
B. Does it significantly affect one or more of the following zone attributes?
1) Zone density
2) Zone environment
3) Potential effect of fire in the zone
4) Frequency of maintenance access to the zone
The zone attributes listed here are considered in the EZAP performed by the aircraft
TC Holder and are rated (e.g., low, medium, or high) as part of the determination of
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix C: Determination If Service Bulletin Modification or STC Requires EZAP 44
wiring inspection levels (GVI or DET) and their intervals. For example, the TC
Holder could conclude that a high-density zone with an environment hostile to wiring
warrants more intense and/or more frequent inspections than wiring in a less dense or
hostile zone. The question is asked here assess whether the modification significantly
affects any of these attributes which would require a re-analysis of the entire zone.
• Zone density – Does the modification affect zone density? If the modification
includes the addition or deletion of numerous components in a small area, the
density of the zone could be changed. A significant change in zone density should
warrant re-analysis of the zone.
• Zone environment – Does the modification have an effect on zone environment?
For example, if the modification installs a new hot-air duct in a zone that could
significantly increase the ambient temperature of the zone during any phase of
operation (including ground operations), re-analysis of the zone is required.
• Potential effect of fire in the zone – Does the modification significantly change the
potential effect of a localized fire on adjacent wiring and systems? This question
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