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torque shafts and bleed air ducts.
Engine, Pylon, and Nacelle Area – These areas experience high vibration, heat, frequent
maintenance, and are susceptible to chemical contamination.
Accessory compartment and equipment bays – These areas typically contain items such as
electrical components, pneumatic components and ducting, hydraulic components and
plumbing, and may be susceptible to vibration, heat, and liquid contamination.
Auxiliary Power Unit (APU) – Like the engine/nacelle area, the APU is susceptible to high
vibration, heat, frequent maintenance, and chemical contamination.
Landing Gear and Wheel Wells – This area is exposed to severe external environmental
conditions in addition to vibration and chemical contamination.
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
TP 14331 Enhanced Zonal Analysis Procedures 15
Electrical Panels and Line Replaceable Units (LRUs) – Panel wiring is particularly prone to
broken wires and damaged insulation when these high density areas are disturbed during
troubleshooting activities, major modifications, and refurbishments. Wire damage may be
minimized by tying wiring to wooden dowels to reduce wire disturbance during modification.
There may be some configurations where connector support brackets would be more desirable
and cause less disturbance of the wiring than removal of individual connectors from the
supports.
Batteries – Wires in the vicinity of all aircraft batteries are susceptible to corrosion and
discoloration. These wires should be inspected for corrosion and discoloration. Discolored
wires should be inspected for serviceability.
Power Feeders – High current wiring and associated connections have the potential to generate
intense heat. Power feeder cables, terminals, and splices may be subject to degradation or
loosening due to vibration. If any signs of overheating are seen, splices or termination should
be replaced. Depending on design, service experience may highlight a need to periodically
check for proper torque of power feeder cable terminal ends, especially in high vibration areas.
This applies to galley and engine/APU generator power feeders.
Under Galleys, Lavatories, and Cockpit – Areas under the galleys, lavatories, and cockpit,
are particularly susceptible to contamination from coffee, food, water, soft drinks, lavatory
fluids, dust, lint, etc. This contamination can be minimized by adherence to proper floor panel
sealing procedures in these areas.
Fluid Drain plumbing – Leaks from fluid drain plumbing may lead to liquid contamination of
wiring. In addition to routine visual inspections, service experience may highlight a need for
periodic leak checks or cleaning.
Fuselage Drain provisions – Some installations include features designed to catch leakage that
is plumbed to an appropriate exit. Blockage of the drain path can result in liquid
contamination of wiring. In addition to routine visual inspections, service experience may
highlight that these installations and associated plumbing should be periodically checked to
ensure the drain path is free of obstructions.
Cargo Bay/Under floor – Damage to wiring in the cargo bay under floor can occur due to
maintenance activities in the area.
Wiring subject to movement – Wiring that is subject to movement or bending during normal
operation or maintenance access should be inspected at locations such as doors, actuators,
landing gear mechanisms, and electrical access panels.
Access Panels – Wiring near access panels may receive accidental damage as a result of
repetitive maintenance access and thus may warrant special attention.
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
TP 14331 Enhanced Zonal Analysis Procedures 16
Under Doors – Areas under cargo, passenger and service entry doors are susceptible to fluid
ingress from rain, snow and liquid spills. Fluid drain provisions and floor panel sealing should
be periodically inspected and repaired as necessary.
Under Cockpit Sliding Windows – Areas under cockpit sliding windows are susceptible to
water ingress from rain and snow. Fluid drain provisions should be periodically inspected and
repaired as necessary.
Areas where wiring is difficult to access – Areas where wiring is difficult to access (e.g.,
flight deck instrument panels, cockpit pedestal area) may accumulate excessive dust and other
contaminants as a result of infrequent cleaning. In these areas it may be necessary to remove
components and disassemble other systems to facilitate access to the area.
10. ENHANCED ZONAL ANALYSIS PROCEDURE
The Enhanced Zonal Analysis Procedure (EZAP) identified in Appendix A of this AC is
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