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not be possible.
Consideration of potential effect must also include whether wiring is in close proximity
(i.e., within 2 inches/50 mm) to both primary and back-up flight controls. A GVI
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix A. Enhanced Zonal Analysis Logic Diagram and Steps 28
alone may not be adequate if a fire caused by failure of the wiring poses a risk to
aircraft controllability.
At minimum, all wiring in the zone will require a GVI at a common interval. For
operators with a Zonal Inspection Program, this may be defined as a Zonal GVI. For
operators without ZIP, it shall be defined as a GVI of all wiring in the zone.
The question is asked, "Is a GVI (or Zonal GVI) of all wiring in the zone at the same
interval effective for all wiring in the zone?" This is to consider if there are specific
items/areas in the zone that are more vulnerable to damage or contamination and thus
may warrant a closer or more frequent inspection.
This determination could result in the selection of a more frequent GVI, a Stand-alone
GVI (for operators with a ZIP), or even a DET inspection. The intention is to select a
DET of wiring only when justified by consideration of all three characteristics of the
zone (size, density, and potential effect of fire). The analyst should be cautious to avoid
unnecessary selection of DET where GVI is adequate. Over-use of DET dilutes the
effectiveness of the inspection.
Note: The level of inspection required may be influenced by tasks identified
in Steps 5 and 6. For example, if a cleaning task was selected in Step 5 and 6
that will minimize the accumulation of combustible materials in the zone, this
may justify selection of a GVI in lieu of a DET for the wiring in the zone.
b) Inspection Interval
The selection of an effective interval can also be accomplished using a rating system. The
characteristics for wiring to be rated should include the following:
• Possibility of Accidental Damage.
• Environmental factors.
The rating tables should be designed to define increasing inspection frequency with
increasing risk of accidental damage and increasing severity of the local environment
within the zone. Examples are provided in Appendix E.
The selection of inspection tasks possible in this step is specific to whether the
maintenance program includes a dedicated Zonal Inspection Program or not.
For ZIP programs, the possible inspection tasks are:
Zonal GVI
● Stand-alone GVI
DET
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix A. Enhanced Zonal Analysis Logic Diagram and Steps 29
For non-ZIP programs, the possible inspection tasks are:
GVI
DET
Note: At this point the analyst will have determined the required inspection level and
interval for wiring in the zone. Task consolidation in Step 9 allows consideration as to
whether an inspection selected as a result of this analysis can be considered
accomplished as part of the existing maintenance program.
Step 9. “Task Consolidation”
This step in the procedure examines the potential for consolidation between the tasks
derived from the Enhanced Zonal Analysis Procedure and inspections that already exist
in the Maintenance Program. Consolidation requires that the inspections in the existing
maintenance program are performed in accordance with the inspection definitions
provided in this TP.
For programs that include a Zonal Inspection Program (ZIP):
Some GVIs identified by application of the Enhanced Zonal Analysis Procedure
may be adequately covered by existing Zonal GVIs in the zone and no change or
addition to the existing Zonal GVI is required. This should reduce the number of
new GVIs that must be introduced into a program that already includes a ZIP.
The consolidation of GVI tasks has to take into account the access requirements and
the interval of each task. The Working Group may conclude that a stand-alone GVI
of the wiring may be justified if the Zonal GVI of the other systems within the same
zone does not need to have such a frequent inspection.
Stand-alone GVIs and DETs identified by application of EZAP cannot be
consolidated into the Zonal Inspection Program and must be introduced and retained
as dedicated tasks in the scheduled maintenance program under ATA 20. These
tasks, along with tasks identified to reduce the accumulation of combustible
materials, shall be uniquely identified to ensure they are not consolidated in the
zonal program nor deleted during future program development. Within MSG-3
based MRB Reports, these may be introduced under ATA 20 with no Failure Effect
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