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that has CPC on it. Application of CPC should be done in accordance with the aircraft
manufacturer’s recommendations.
12. ALTERATION
The program to enhance EWIS maintenance also applies to EWIS installed, modified, or
affected by operator alterations or STCs. Alterations that could affect EWIS include, but are
not limited to, those that install new equipment in close proximity to wiring, introduce a heat
source in the zone, or introduce potential sources of combustible material or harmful
contamination into the zone.
The operator is responsible for determining if the EWIS has been altered (or affected by
alteration) and enhancing the maintenance program as appropriate.
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix A. Enhanced Zonal Analysis Logic Diagram and Steps 22
APPENDIX A. ENHANCED ZONAL ANALYSIS PROCEDURE DIAGRAM
Figure 1. Enhanced Zonal Analysis Procedure
Identify aircraft zones, including boundaries
List details of Zone, e.g.
- Access
- Installed equipment
- L/HIRF protection features
- Wire bundle installation
- Possible combustible materials
Zone
contains
wiring?
Combustible
materials in
zone?
Is wiring close to
both primary and
back-up hydraulic,
mechanical, or
electrical flight
controls?
Is there an effective
task to significantly
reduce the likelihood
of accumulation of
combustible
materials?
Define task and Interval
Maintenance Program
Systems and Powerplant Section
Recommend inclusion in ATA 20
Maintenance Program
Zonal Section
Aircraft with ZIPs
Selection of wiring inspection
Level and interval
See Figure 2.
Inspection Task(s)
Yes
Yes
Yes
Yes
No
No
No
No
GVI
Stand-alone GVI
DET
Consider consolidation with existing
inspection tasks in Systems &
Powerplant and/or Zonal Programs
1.
2.
3.
4.
5.
6.
7.
8.
9.
GVI consolidated in
Zonal Inspection
No further action
Continue the analysis
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix A. Enhanced Zonal Analysis Logic Diagram and Steps 23
List zone
description and
boundaries for
GVI of all wiring
in the zone
List zone
description and
boundaries for
Zonal GVI
Zonal GVI must be
augmented with Standalone
GVI and/or DET
inspection Some wiring requires
GVI at more frequent
interval and/or DET
inspection
Using rating tables, assess zone attributes to
determine appropriate level of inspection
(examples provided in Appendix B)
Define specific
wiring in the zone
for which GVI at
more frequent
interval is justified
Define specific
wiring in the zone
for which DET is
justified
Define specific
wiring in the
zone for which
Stand-alone
GVI is justified
Define specific
wiring in the
zone for which
DET is justified
Using rating tables, assess likelihood of damage
to wiring in the zone to determine an appropriate
interval for each inspection task identified
(examples provided in Appendix B)
Programs with Zonal
Inspection Program included
Programs without Zonal
Inspection Program
Figure 2. Step 8 - Wiring Inspection Level and Interval Selection
Yes
No
No
Yes
Is Zonal GVI
alone effective
for all wiring in
the zone?
Is GVI of
all wiring in the
zone at same
interval effective
for all wiring in the
zone?
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix A. Enhanced Zonal Analysis Logic Diagram and Steps 24
Explanation for Steps in Enhanced Zonal Analysis Procedure Logic Diagram. The following
paragraphs provide further explanation of each step in the Enhanced Zonal Analyses Procedure
logic, (Figures 1 and 2). It is recommended that, where possible, the analysts utilize the
availability of actual aircraft to ensure they fully understand the zones being analyzed. This
will aid in determination of density, size, environmental issues, and accidental damage issues.
Step 1. “Identify aircraft zones, including boundaries”
The system consists of Major Zones, Major Sub Zones and Zones.
The zones, wherever possible, shall be defined by actual physical boundaries such as
wing spars, major bulkheads, cabin floor, control surface boundaries, skin, etc., and
　
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