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PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
TP 14331 Enhanced Zonal Analysis Procedures 1
1. PURPOSE
This Transport Publication (TP) provides guidance for developing enhanced electrical wiring
interconnection system (EWIS) maintenance for air carriers, air operators, holders of type
certificates, holders of supplemental type certificates (STCs), maintenance providers, repair
stations, and persons performing modifications or repairs. The guidance in this TP is based on
recommendations submitted from the Aging Transport Systems Rulemaking Advisory
Committee (ATSRAC). The information in this TP is derived from the maintenance,
inspection, and alteration best practices identified through extensive research by ATSRAC
working groups and federal government working groups. This TP provides a means for
TCCA to officially endorse these best practices and to dispense this information industry wide
so that the safety benefits of this information can be realized. Adoption of the
recommendations in this TP will improve the awareness throughout the aviation industry of the
importance of visual inspections of aircraft systems, particularly aircraft EWIS. This TP
promotes a housekeeping philosophy of “protect, clean as you go” when performing
maintenance, repair, or alterations on or around aircraft EWIS. This guidance is equally
applicable to non-wiring related maintenance and modification activities where those activities
could cause inadvertent contamination or damage to wiring.
2. OBJECTIVE
The objective of this TP is to enhance the maintenance of aircraft EWIS through
adoption by the aviation industry of the following:
(1) Enhanced Zonal Analysis Procedure (EZAP). This TP presents an “enhanced zonal
analysis procedure” and logic that will benefit all aircraft regardless of whether they
currently have a structured zonal inspection program (see Appendix A. Enhanced
Zonal Analysis Logic Diagram and Steps and Appendix B. EZAP Worksheets).
Application of this procedure will ensure that appropriate attention is given to wiring
installations. Using EZAP it will be possible to select stand-alone inspections (either
General or Detailed) and tasks to minimize the presence of combustible material. The
procedure and logic in this TP complement existing zonal analysis procedures and will
also allow the identification of new wiring tasks for those aircraft that do not have a
structured zonal inspection program.
(2) Guidance for General Visual Inspection (GVI). This TP clarifies the definition for a
General Visual Inspection and describes what is expected from a stand-alone GVI or
zonal inspection task.
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
TP 14331 Enhanced Zonal Analysis Procedures 2
(3) Protections and Cautions. This TP identifies information for the protection of aircraft
EWIS and cautions to be added to maintenance instructions, that will lead to minimization
of contamination and accidental damage while working on the aircraft.
The information concerning enhanced aircraft wiring maintenance that has been
described in this TP applies to maintenance and inspection programs for all aircraft systems.
When these new practices are used appropriately, it will improve the likelihood that EWIS
degradation, including age related problems, will be identified and corrected. Therefore, the
goal of enhanced wiring maintenance information is to ensure that maintenance actions, such as
inspection, repair, overhaul, replacement of parts, and preservation, do not cause a loss of
EWIS function, do not cause an increase in the potential for smoke and fire in the aircraft, and
do not inhibit the safe operation of the aircraft.
To fully realize the objectives of this TP, air carriers, air operators, type certificate
holders, STC holders, maintenance providers, repair stations and persons performing
modifications or repairs, will need to rethink their current approach to maintaining and
modifying aircraft wiring and systems. This may require more than simply updating
maintenance manuals and work cards and enhancing training. Maintenance personnel need to
be aware that aircraft EWIS should be maintained with the same level of intensity as any other
system in the aircraft. They also need to recognize that visual inspection of wiring has
inherent limitations. Small defects such as breached or cracked insulations, especially in small
gage wire may not always be apparent. Therefore effective wiring maintenance combines
visual inspection techniques with improved wiring maintenance practices and training.
Good wiring maintenance practices should contain a "protect, clean as you go"
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