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distance) and the allowance to use a mirror to enhance visual access to exposed
surfaces when performing a GVI. These changes should result in more consistent
application of GVI and support the expectations of what types of EWIS
discrepancies should be detected by a GVI.
Though flashlights and mirrors may be required to provide an adequate view of all
exposed surfaces, there is no requirement for equipment removal or displacement
unless this is specifically called for in the access instructions. Paint and/or sealant
removal is not necessary and should be avoided unless the observed condition is
suspect. Should unsatisfactory conditions be suspected, items may need to be
removed or displaced in order to permit proper assessment.
It is expected that the area to be inspected is clean enough to minimize the
possibility that accumulated dirt or grease might hide unsatisfactory conditions that
would otherwise be obvious. Any cleaning that is considered necessary should be
performed in accordance with accepted procedures in order to minimize the
possibility of the cleaning process itself introducing anomalies.
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
TP 14331 Enhanced Zonal Analysis Procedures 11
In general, the person performing a GVI is expected to identify degradation due to
wear, vibration, moisture, contamination, excessive heat, aging, etc., and make an
assessment as to what actions are appropriate to address a noted discrepancy. In
making this assessment, any potential effect on adjacent system installations should
be considered, particularly if these include wiring. Observations of discrepancies,
such as chafing, broken clamps, sagging, interference, contamination, etc., need to
be addressed.
(3) Zonal Inspection.
A collective term comprising selected General Visual Inspections and
visual checks that are applied to each zone, defined by access and
area, to check system and power plant installations and structure for
security and general condition.
A Zonal Inspection is essentially a GVI of an area or zone to detect obvious
unsatisfactory conditions and discrepancies. Unlike a stand-alone GVI, it is not
directed to any specified component or assembly.
b. Guidance for Zonal Inspections.
The following EWIS degradation items are typical of what should be detectable and
subsequently addressed as a result of a zonal inspection (as well as a result of a
stand-alone GVI). It is also recommended that these items be included in
maintenance and training documentation. This list is not intended to be exhaustive
and may be expanded as considered appropriate.
(1) Wire / Wire Harnesses
• Wire bundle/wire bundle or wire bundle/structure contact/chafing
• Wire bundle sagging or improperly secured
• Wires damaged (obvious damage due to mechanical impact,
overheat, localized chafing, etc.)
• Lacing tape and/or ties missing/incorrectly installed
• Wiring protection sheath/conduit deformity or incorrectly installed
• End of sheath rubbing on end attachment device
• Grommet missing or damaged
• Dust and lint accumulation
• Surface contamination by metal shavings/swarf
• Contamination by liquids
• Deterioration of previous repairs (e.g., splices)
• Deterioration of production splices
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
TP 14331 Enhanced Zonal Analysis Procedures 12
• Inappropriate repairs (e.g., incorrect splice)
• Inappropriate attachments to or separation from fluid lines
(2) Connectors
• External corrosion on receptacles
• Backshell tail broken
• Rubber pad or packing on backshell missing
• No backshell wire securing device
• Fool proofing chain broken
• Missing or broken safety wire
• Discoloration/evidence of overheat on terminal lugs/blocks
• Torque stripe misalignment
(3) Switches
• Rear protection cap damaged
(4) Ground points
• Corrosion
(5) Bonding braid/bonding jumper
• Braid broken or disconnected
• Multiple strands corroded
• Multiple strands broken
(6) Wiring clamps or brackets
• Corroded
• Broken/missing
• Bent or twisted
• Faulty attachment (bad attachment or fastener missing)
• Unstuck/detached
• Protection/cushion damaged
(7) Supports (rails or tubes/conduit)
• Broken
• Deformed
• Fastener missing
• Missing edge protection on rims of feed through holes
• Racetrack cushion damaged
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