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instructions.
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
TP 14331 Enhanced Zonal Analysis Procedures 18
• Item 2: Structural Repairs, STCs, Modifications
Structural repair, STC or modification activity inherently introduces tooling and
residual debris that is harmful to aircraft wiring. Structural repairs or modifications
often require displacement (or removal) of wiring to provide access to the work area.
Even minor displacement of wiring, especially while clamped, can damage wire
insulation, which can result in degraded performance, arcing, or circuit failure.
Extreme care should be exercised to protect wiring from mechanical damage by tools or
other equipment used during structural repairs, STCs or modifications. Drilling blindly
into the aircraft structure should be avoided. Damage to wire installation could cause
wire arcing, fire and smoke. Wiring located adjacent to drilling or riveting operations
should be carefully displaced or covered to reduce the possibility of mechanical
damage.
Debris such as drill shavings, liberated fastener pieces, broken drill bits, etc., should
not be allowed to contaminate or penetrate wiring or electrical components. This can
cause severe damage to insulation and potential arcing by providing a conductive path
to ground or between two (2) or more wires of different loads. Once contaminated,
removal of this type of debris from wire bundles is extremely difficult. Therefore,
precautions should be taken to prevent contamination of any kind from entering the
wire bundle.
Before initiating structural repair, STC or modification activity, the work area should
be carefully surveyed to identify all wiring and electrical components that may be
subject to contamination. All wiring and electrical components in the debris field
should be covered or removed to prevent contamination or damage. Consideration
should be given to using drills equipped with vacuum aspiration to further minimize
risk of metallic debris contaminating wire bundles. Clean electrical components and
wiring after completion of work per applicable maintenance instructions.
• Item 3: Aircraft De-Icing or Anti-Icing.
To prevent damage to exposed electrical components and wiring in areas such as wing
leading and trailing edges, wheel wells, and landing gear, care should be exercised
when spraying de/anti-icing fluids. Direct pressure spray onto electrical components
and wiring can lead to contamination or degradation and thus should be avoided.
• Item 4: Inclement Weather.
Electrical wiring interconnection systems in areas below doorways, floors, access
panels, and servicing bays are prone to corrosion or contamination due to their
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
TP 14331 Enhanced Zonal Analysis Procedures 19
exposure to the elements. Snow, slush, or excessive moisture should be removed from
these areas before closing doors or panels. Remove deposits of snow/slush from any
items (e.g., cargo containers) before loading in the aircraft. During inclement weather,
keep doors/panels closed as much as possible to prevent ingress of snow, slush, or
excessive moisture that could increase potential for EWIS degradation.
• Item 5: Component Removal/Installation (Relating to Attached Wiring).
Excessive handling and movement during removal and installation of components may
be harmful to aircraft wiring. Use appropriate connector pliers (e.g., soft jawed) to
loosen coupling rings that are too tight to be loosened by hand. Alternately pull on the
plug body and unscrew the coupling ring until the connector is separated. Do not use
excessive force, and do not pull on attached wires. When reconnecting, special care
should be taken to ensure the connector body is fully seated, the jam nut is fully
secured, and no tension is on the wires.
When equipment is disconnected use protective caps on all connectors (plug or
receptacle) to prevent contamination or damage of the contacts. Sleeves or plastic bags
may be used if protective caps are not available. Use of sleeves or plastic bags should
be temporary because of the risk of condensation. It is recommended to use a humidity
absorber with sleeves or plastic bags.
• Item 6: Pressure Washing.
To prevent damage to exposed electrical components and wiring in areas such as wing
leading and trailing edges, wheel wells, and landing gear, care should be exercised
when spraying water or cleaning fluids. Direct high-pressure spray onto electrical
components and wiring can lead to contamination or degradation and should be
avoided. When practical, wiring and connectors should be protected before pressure
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