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If a GVI of all wiring in the zone at the same interval is adequate, the analyst must identify the inspection
requirement as "GVI of all w iring in the zone" (Box 2) and proceed to Sheet 4 to determine the GVI interval.
If a GVI of all wiring in the zone at the same interval is not adequate, then the analyst must identify the
specific items/areas in the zone where a more frequent GVI (Box 3) and/or a DET inspection (Box 4) is
justified.
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix B. Examples of Typical EZAP Worksheets 36
Enhanced Zonal Analysis - Interval Determination Based on Hostility of Environment and Likelihood of Accidental Damage Sheet 4 of 5
ZONE NO:
Item/Area Defined for Inspection:
1 2 3
1 4C-6C 2C-4C 1C-2C
2 2C-6C 1C-4C A-1C
3 1C-6C 1C-4C A-1C
Upon completion, enter all task and interval selections onto Sheet 5, Task Summary.
Hostility of
Environment
Interval Determination
Humidity
Hostility of Environment
ZONE DESCRIPTION:
Sample EZAP Worksheet Date: Sheet 4 of 5
Contamination
1 - Passive, 2 - Moderate, 3 - Severe
Highest Result Other -
RESULT
Likelihood of Accidental Damage
Vibration
Highest Result
Other -
Weather Effects (hail, etc.)
Frequency of Maintenance Activities
Fluid Spillage
Passenger Traffic
Chemicals (toilet fluids, etc.)
1 - Low, 2 - Medium, 3 - High
Ground Handling Equipment
F. O. D.
Temperature
Interval selection is specific to each task identified on Sheet 3A or 3B. For GVI of entire zone, consider overall zone environment and likelihood of
damage. For Stand-alone GVI or DET, consider environment and likelihood of damage only in respect to the specific item/area defined for
inspection.
Inspection Level:
Likelihood of Accidental Damage
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix B. Examples of Typical EZAP Worksheets 37
Enhanced Zonal Analysis - Task Summary Sheet 5 of 5
ZONE NO:
Zone Description:
Task Number Access Interval
TASK SUMMARY
Sample EZAP Worksheet Date: Sheet 5 of 5
Task Description
ZONE DESCRIPTION:
This Sheet is used to list all tasks and intervals selected
as a result of EZAP analysis.
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix B. Examples of Typical EZAP Worksheets 38
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PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix C: Determination If Service Bulletin Modification or STC Requires EZAP 39
APPENDIX C: DETERMINATION IF SERVICE BULLETIN MODIFICATION OR STC
REQUIRES EZAP
The EZAP provides a means for TC and STC Holders to develop improvements to EWIS
maintenance programs. These improvements will be in the form of new inspections and other
tasks designed to prevent significant accumulation of combustible materials on or adjacent to
EWIS components that would be added to the Instructions for Continued Airworthiness or
Service Bulletins (SBs) for the aircraft and STC’s.
While TC Holders are required to conduct the EZAP for all zones in an aircraft, it may be
determined that EZAP for an SB or STC is not necessary where the modification does not
appreciably affect the zones where it is installed. The “Determination if Service Bulletin
Modification or STC Requires EZAP” procedure was developed to identify modifications that
sufficiently affect zone attributes to warrant re-application of EZAP to the entire zone.
This logic assumes that the aircraft TC holder has accomplished the EZAP on each zone of the
aircraft without consideration of the SB modification or STC installation. The objective of this
analysis is to assess whether the modification itself has affected wiring or certain zone
attributes that could change the outcome of the EZAP performed by the aircraft type certificate
holder.
The determination if the SB or STC requires EZAP, and re-application of the EZAP to SB or
STC affected zones, is the responsibility of the respective Holder of the SB or STC. It is
expected that the TC and STC Holders will collaborate with each other and Operators as
necessary to obtain information required to conduct the analysis. The TC or STC Holder
should communicate the results of the procedure, including when no new tasks are identified.
The method of communication may be via Service Bulletin or Service Letter and ICAW
Revision, or other means acceptable to the TCAA.
In situations where a previously installed STC is no longer supported by a viable STC Holder
(e.g., STC Holder defunct), the responsibility for determining if the STC requires EZAP, and
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