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zone based on an assessment o f zone size, de n s ity , an d poten tial e ffects o f fire in the zone.
This w orksheet is des igned for operators w hose e x isting m aintenance p rogram a lrea d y include s a
ded icated Zonal Inspection P rogram. It is assumed that an e x isting Z IP a lrea d y inc ludes a Zonal
GVI o f a ll zones tha t con ta in w iring, a n d that the w iring is included in the Zonal G VI.
The m in imum outcom e o f this an a lysis will a lways be a Zonal G VI o f any zone w here the p resenc e
o f combustib le m ateria ls is p o s s ib le and/or w iring is located in close proximity to both p rimary an d
backup h y d raulic o r m echanica l flight c o n trols.
The Inspection Level D etermination Tab le a llows the Analyst to determine if a Zonal G VI a lone is
adequa te for a ll w iring in the zone, or if the Zonal GVI m us t be augm ented with a Stand-alone G VI
and /or a DET inspection o f some po rtion o f the w iring.
If a Z onal GV I is adequate for a ll w iring in the zone, the analys t m us t identify the inspection a rea a s
the zone itself (B ox 2). In te rval sele c tion w ill be m ade on S heet 4.
If a Z onal GV I is not adequate fo r a ll w iring in the zone, in addition to identify ing the Zonal G V I (B ox
2), the analyst must a lso any identify the specific items /areas in the zone w here a Stand-alone G VI
(Box 3 ) and/or a DET inspection (Bo x 4 ) is jus tified.
Note: W hile it is useful to know the e x isting Zonal G VI interval w hile conducting this an a lysis, it is
not a s sumed that the Z onal GV I in te rval selected during th is analy sis with respec t to w iring w ill be
the same a s the e xis ting inte rval. During task consolidation afte r completion o f the analy s is, the
most frequent Z onal GV I in te rval fo r the zone w ill ta ke precedent.
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix B. Examples of Typical EZAP Worksheets 35
Enhanced Zonal Analysis - Inspection Level Determination based on Zone Size, Density, Potential Impact of Fire Sheet 3B of 5
Small Medium Large
Low 1 2 3 Low GVI o f all w iring in zone
at same interval
GVI o f all w iring in zone
at same interval
GVI o f all w iring in zone
at same interval
Medium 2 2 3 Medium GVI o f all w iring in zone
at same interval
GVI o f all w iring in zone
at sam e interval + GVI of
some w iring at more
frequent interval
GVI o f all w iring in zone
at sam e interval + GVI of
some w iring at more
frequent interval
High 2 3 3 High
GVI o f all w iring in zone
at sam e interval + GVI of
some w iring at more
frequent interval
GVI o f all w iring in zone
at sam e interval + GVI of
some w iring at more
frequent interval and/or
DET o f some w iring
GVI o f all w iring in zone
at sam e interval + GVI of
some w iring at more
frequent interval and/or
DET o f some w iring
Circle appropriate result and insert below.
Yes
No
3. Define specific items/areas in
the zone for which GVI at more
frequent interval is justified.
Some wiring requires GVI at
more frequent interval and/or
DET inspection.
4. Define specific items/areas in
the zone for which DET is
justified.
Circle appropriate result and answer questions in Boxes below.
RESULT:
Zone Size/Density Assessment Inspection Level Determination Based on Potential Effect of Fire in Zone
ZONE NO:
For Programs w ithout dedicated Zonal Inspection P rogram (ZIP)
ZONE DESCRIPTION:
Size/Density 1 3
Zone S ize Factor 2
If answer to Box 1 is 'Yes" , answer Box 2 only. If answer to Box
1 is 'No', answer Boxes 2, 3, & 4.
2. List zone description and
boundaries for GVI of all wiring
in the zone.
1. Is a GVI alone effective for
all wiring in the zone at the
same interval?
Sample EZAP W orksheet Date: Date:
Answers & Explanation:
1.
2.
3.
4.
.
The tables on this sheet are used to select an Inspection Level based on zone size, density, and potential
effect of fire in the zone. These factors are used to determine if a GVI of all w iring in the zone at the same
interval is adequate, or if some w iring requires a more frequent GVI, or even a DET inspection.
This worksheet is designed for operators whose existing maintenance program does not include a dedicated
Zonal Inspection Program. The m inimum outcome of this analysis w ill always be a GVI of all w iring in any
zone where the presence of combustible materials is possible and/or wiring is located in close proximity to
both primary and backup hydraulic or mechanical flight controls.
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