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washing. Water rinse should be used to remove cleaning solution residue after
washing. Breakdown of wire insulation may occur with long-term exposure of wiring
to cleaning solutions. Although these recommendations are good practice and
technique, the aircraft maintenance manual or STC holder’s instructions for continued
airworthiness should be consulted for additional detailed instructions regarding pressure
washing.
• Item 7: Cleaning of Electrical Wiring Interconnection Systems (In-situ).
Extreme care should be exercised and proper procedures used during cleaning to ensure
safe and reliable performance of the function supplied by the wiring.
Care should be taken to avoid displacement or disturbance of wiring during cleaning of
non-aggressive contamination. However, in the event of contamination by aggressive
contaminants (e.g., livestock waste, salt water, battery electrolyte, etc.) such
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
TP 14331 Enhanced Zonal Analysis Procedures 20
displacement may be necessary. In these cases wiring should be released from its
installation so as to avoid undue stress being induced in wiring or connectors.
Similarly, if liquid contamination enters the bundle then ties should be removed before
separating the wires. Although these recommendations for cleaning of EWIS are
considered good practice and technique, the aircraft maintenance manual or STC
holder’s instructions for continued airworthiness should be consulted for additional
detailed instructions.
Clean only the area and items that have contamination. Before cleaning, make sure that
the cleaning materials and methods will not cause more contamination. If a cloth is
used, make sure that it is clean, dry, and lint-free. A connector should be completely
dry before mating. Any fluids remaining on a connector can have a deteriorating affect
on the connector or the system or both.
• Item 8: Servicing, Modifying, or Repairing Waste Water Systems.
Electrical wiring interconnection systems in areas adjacent to waste/water systems are
prone to contamination from those systems. Care should be exercised to prevent any
fluids from reaching electrical components and wiring while servicing, modifying, or
repairing waste/water systems. Cover exposed electrical components and wiring during
waste/water system modification or repair. Operator practice may call for a weak acid
solution to be periodically flushed through lavatory systems to enhance reliability and
efficiency of operation. In view of the effect of acid contamination on systems and
structure, the system should be confirmed to be free of leaks before using such
solutions.
• Item 9: Servicing, Modifying, or Repairing Oil Systems.
Electrical wiring interconnections in areas adjacent to oil systems are prone to
contamination from those systems. To minimize the attraction and adhesion of foreign
material, care should be exercised to avoid any fluids from reaching electrical
components and wiring while servicing, modifying, or repairing oil systems. Oil and
debris in combination with damaged wiring can present a fire hazard.
• Item 10: Servicing, Modifying, or Repairing Hydraulic Systems.
Electrical wiring interconnection system in areas adjacent to hydraulic systems are
prone to contamination from those systems. To minimize the attraction and adhesion of
foreign material, care should be exercised to avoid any fluids from reaching electrical
components and wiring while servicing, modifying, or repairing hydraulic systems.
• Item 11: Gaining Access (Entering Zones).
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
TP 14331 Enhanced Zonal Analysis Procedures 21
When entering or working on the aircraft, care should be exercised to prevent damage
to adjacent or hidden electrical components and wiring, including wiring that may be
hidden from view (e.g., covered by insulation blankets). Use protective boards or
platforms for adequate support and protection. Avoid using wire bundles as handholds,
steps and supports. Work lights should not be hung or supported by wiring. If wiring
must be displaced (or removed) for work area access, it should be adequately released
from its clamping (or other restraining provisions) to allow movement without damage
and returned after work is completed.
• Item 12: Application of Corrosion Preventions Compounds (CPC).
When applying CPC in aircraft zones containing wire and associated components (i.e.,
clamps, connectors and ties), care should be taken to prevent CPC from coming in
contact with the wire and components. Dust and lint is more likely to collect on wire
　
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