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re-application of EZAP to any affected zones, is assigned to the individual operators who
utilize the STC on their aircraft. In cases where the operator does not have experience in
application of analytical logic processes, it will be necessary for the operator to gain
competence in, or seek external assistance in conducting the analysis.
A record of the outcome of Operator accomplished analysis for STC’s (even if no tasks are
identified) should be permanently retained by the Operator. A copy of the record should be
included in the aircraft records normally transferred upon change of aircraft operator.
The attached logic chart provides a means to assess whether an SB modification or STC has
sufficiently affected wiring or certain other zone attributes as to require reapplication of the
EZAP to the entire zone with consideration of the modification present. The section following
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix C: Determination If Service Bulletin Modification or STC Requires EZAP 40
the chart provides detailed explanations of each step in the Determination If Service Bulletin
Modification or STC Requires EZAP with appropriate examples.
It is recommended that where possible, the analyst should utilize the availability of actual
aircraft to ensure they fully understand the zones being analyzed. Specifically, it must be
determined how installation of the modification could affect zone attributes such as density,
environment, proximity of wiring to primary and backup flight controls, presence of
combustible materials, and potential for accidental damage to wiring.
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix C: Determination If Service Bulletin Modification or STC Requires EZAP 41
For each zone containing any portion of the
modification installation - answer the following.
1.
Does the modification
install or route wire(s)
within 2 in (50 mm) of both
primary & backup
hydraulic, mechanical, or
electrical flight controls?
Yes
No
2. 3.
5.
Appendix C. Figure 1. Determination if Service Bulletin Modification
or STC Requires EZAP
Identify DET for wiring
installed or routed by the
modification in area of
close proximity to flight
controls. Assign interval
based on EZAP
Worksheet 4 in Appendix
B of this AC
Continue the analysis
Does the SB or STC modification affect key
zone attributes?
A. Does it introduce the potential for presence
of combustible materials for the first time?
B. Does it significantly affect one or more of
the following attributes?
• Zone density
• Zone environment
• Potential affect of fire in the zone
• Frequency of maintenance access
to the zone
EZAP must be accomplished on entire zone
with consideration of SB or STC installed
See Appendix A Figure 1.
Yes
No further action
9.
No
Was a task
included in
SB or STC
ICAW in Box
4 above?
Yes No
Comply with any
published special
reporting
requirement for
STCs if EZAP
not required
Include DET and Interval in
Service Bulletin or STC
Instructions for Continued
Airworthiness
4.
6.
8.
7.
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix C: Determination If Service Bulletin Modification or STC Requires EZAP 42
Determination If Service Bulletin Modification or STC Requires EZAP
(a) Explanation of Steps
Step 1. "For each zone containing any portion of the modification installation - answer the
following.”
Using the aircraft manufacturer's zone identification system (typically, zone numbers),
identify all zones where any portion of the modification is installed, including non-wiring
portions such as plumbing, ducting, cables, etc.
For each zone containing any portion of the modification, perform the following Steps:
Step 2. “Does the modification install or route wire(s) within 2 in (50 mm) of both primary &
backup hydraulic, mechanical, or electrical flight controls?”
This questions addresses the concern that segregation between primary and back-up flight
controls may not have been consistently achieved in the aircraft design. Even in the
absence of combustible material, a localized arc emanating from wiring could impact
continued safe flight and landing if the wiring is within 2-inches/50 mm of hydraulic,
mechanical, or electrical flight controls. In consideration of the redundancy in flight
control systems, the question need be answered ‘Yes’ only if both the primary and back-up
　
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