TM 55-1520-240-23-3
4-11.3
REPAIR OF ENGINE ELECTRICAL HARNESS
(Continued)
4-11.3
GENERAL
The following cautions and notes are common and
applicable to all procedures of this task.
Use only conduit (plastic jaw) pliers
and strap wrenches when working
with harness connecting hardware, or
damage to assemblies and adjacent
hardware may result. If coned
junction conduit connections are too
tight to be loosened as described,
standard connector pliers can be
used if coned conduit coupling
nuts are first wrapped with masking
tape (E388). Use Engine Harness
Retention Tool (APP E-228) to restrain
coned sections whenever possible;
otherwise damage could occur.
Do not use solvent when cleaning conduit
assemblies; damage to material will
result.
When removing conduit material,
grasp harness around wiring as
much as possible. This helps prevent
unnecessary strain on wiring that
could cause damage at connections
elsewhere in the harness especially
at corresponding engine accessory
connectors.
Make sure to apply silicone sealant
(E340.2) to threads before installing
conduit coupling nuts and connector
fittings. Sealant not only seals
harness, but also secures fitting and
coupling nuts because lockwire is not
used.
NOTE
Maintenance described in this task is
typical and may be applied to entire
harness. Illustrations are typical and
used as reference when repairing
other parts of the harness.
Harness conduit material and
junctions only provide protection and
routing of internal wiring. Junction
connectors attach only conduit
material, not wiring. Internal wiring
runs directly from aircraft disconnect
to appropriate connectors with
separation and distribution of wiring
provided by Y and coned junctions.
With 43 , Y junction and conduit
sections preceding and following Y
junction are replaced by a single
conduit between two coned junctions.
When performing maintenance on
connectors and adjacent fittings
where access to wiring and back
of connectors is necessary, conduit
should be restrained away from
connector hardware with a clamp or
other material.
Check condition of connector insert
and housing whenever maintenance is
performed on a connector or adjacent
hardware. Replace connector insert
or housing if either is damaged so that
secure, sealed connections cannot
be made.
When repairing or replacing harness
wiring, make sure new wiring is long
enough to avoid strain on itself or rest
of harness after repairs have been
made.
Replace entire shielded cable if its
internal wire is damaged or detective.
Make sure water or other fluids
that may have entered conduit, are
completely drained before repairing
conduit or other parts of the harness.
Make sure hands are free of dirt
and oil when applying silicone self
vulcanizing tape (E395.1).
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