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designed to permit appropriate attention to be given to electrical wiring installations. This is
achieved by providing a means to identify applicable and effective tasks to minimize
accumulation of combustible materials and address wiring installation discrepancies that may
not otherwise be reliably detected by inspections contained in existing maintenance programs.
For aircraft models operating on maintenance programs that already include a dedicated Zonal
Inspection Program (ZIP), the logic described in this TP will result in enhancements to those
programs, and the zonal inspection requirements may not differ greatly from the existing ZIPs.
In analysis conducted under the EZAP, items such as plumbing, ducting, systems installations,
etc., should be evaluated for possible contribution to wiring failures. In cases where a General
Visual Inspection is required to assess degradation of these items, a Zonal GVI within a ZIP
may be considered as appropriate.
For those operators that do not have a dedicated ZIP, application of the logic is likely to result
in identification of a large number of wiring related tasks that will need to be consolidated
within the existing Systems/Powerplant Program.
In either case, any new tasks identified by the logic may be compared with existing tasks and
credit given for equivalent tasks already contained in the maintenance program. For operators
with ZIPs that already contain Zonal GVIs, the number of new tasks that must be added to the
program may be significantly fewer than for an operator without a dedicated ZIP. Therefore,
operators without a ZIP may find it beneficial to develop a ZIP in accordance with an industryaccepted
methodology in conjunction with application of the EZAP.
The logic and procedures identified in this TP apply to TCs, STCs, and Service Bulletins. It is
expected that the TC and STC holders would use the logic and procedures to identify any need
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
TP 14331 Enhanced Zonal Analysis Procedures 17
for additional instructions for continued airworthiness. Operators may be required to use the
logic to identify additional instructions for STCs where the STC has been “orphaned” (i.e., no
longer supported by the STC holder).
While TC Holders are required to conduct the EZAP for all zones in an aircraft, it may be
determined that EZAP for a Service Bulletin or STC is not necessary where the modification
does not appreciably affect the zones where it is installed. Appendix C, “Determination if
Service Bulletin Modification or STC Requires EZAP”, was developed to identify
modifications that sufficiently affect zone attributes to warrant re-application of EZAP to the
entire zone.
11. MAINTENANCE PRACTICES: PROTECTION AND CAUTION
RECOMMENDATIONS.
TCCA together with the other participating regulatory authorities identified some specific
maintenance and servicing tasks for which more robust practices are recommended to be
adopted by air carriers, air operators, maintenance providers, repair stations. These
recommendations apply to all tasks, including those performed on an unscheduled basis without
an accompanying routine job instruction card. Performance of these maintenance practices
will help prevent contamination of EWIS that result from contact with harmful solids (such as
metal shavings) or fluids during maintenance, modifications, and repairs of aircraft structures,
and components. In addition the training of maintenance and servicing personnel should
address the potential consequences of their actions on the wiring in the work vicinity.
• Item 1: Installation, Repair, or Modification to Wiring.
Wiring and its associated components (protective coverings, connectors, clamping
provisions, conduits, etc.) often comprise the most delicate and maintenance sensitive
portions of an installation or system. Extreme care should be exercised and proper
procedures used during installation, repair, or modification of wiring to ensure safe and
reliable performance of the function supplied by the wiring.
Proper wire selection, routing/separation, clamping configurations, use of splices,
repair or replacement of protective coverings, pinning/de-pinning of connections, etc.,
should be performed in accordance with the applicable sections of the Aircraft
Maintenance Manual (AMM), Wiring Practices Manual (WPM), or other documents
authorized for maintenance use. In addition, special care should be taken to minimize
disturbance of existing adjacent wiring during all maintenance activities. When wiring
is displaced during a maintenance activity, special attention should be given to returning
it to its normal configuration in accordance with the applicable maintenance
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