MD Helicopters 369-500, Maintenance Instructions Manual

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CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
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1999 − 2016 by MD Helicopters, Inc.
3. Wiring Inspection
A. Wire Harness Inspection
(Ref. Figure 603)
NOTE:
D
Perform this inspection upon completion
of maintenance on a wire harness or as
otherwise directed.
D
This procedure applies to RF cables.
D
Not all steps are applicable when per­
forming this procedure on completed
maintenance.
(1). Visually inspect wire harness for
contact with structure. If harness
contacts structure, perform the follow­
ing:
(a). Inspect individual wires contacting
structure for damage. If damage
limitations are exceeded, repair or
replace as necessary.
(b). Inspect section of RF cable contacting
structure for damage. If damage
limitations are exceeded, replace
cable.
(c). Apply anti-chaffing provisions to
section of wire harness in contact
with structure (Ref. Wire Mainte­
nance Procedures). A protected
harness in contact with a smooth
surface is allowed.
(d). Re-route, or adjust routing of
harness if contact is with a sharp
edge. Wiring in contact with sharp
edges is not allowed.
(2). Visually inspect wire harness for proper
support and protection as follows:
(a). Inspect condition of harness clamps.
Replace clamp if cushion is damaged,
and tighten attachment hardware if
loose.
(b). Install additional clamps if necessary,
and only if structure can support the
installation.
(c). Inspect harness for missing or broken
spot ties. Apply tying tape to harness
as required.
(d). Inspect anti-chaffing provisions for
wear or damage. Replace provisions
if necessary.
NOTE:
If anti-chaffing provision is found worn
or damaged, it may be necessary to adjust
routing of wire harness to avoid future dam­
age.
(3). Visually inspect routing of wire harness
using the following criteria:
(a). Minimum distance between harness
and movable components shall be 0.5
in. (12.7 mm).
(b). Wire attached to moving assemblies
shall twist instead of bend.
(c). Tangles, kinks, and crossovers are
not permitted.
(d). Adjust harness routing as required to
meet criteria.
(4). Visually inspect bends in wire harness
and make sure minimum allowable
radius is not exceeded. Use following
criteria:
(a). Minimum bend radius for single
wires (non-coaxial) shall be 10 times
the outside diameter of wire.
(b). Minimum bend radius for (non-coaxi­
al) single wire, group, bundle or
harness at terminations shall be 3
times the outside diameter of largest
included single wire.
(c). Minimum bend radius for (non-coaxi­
al) group, bundle or harness shall be
6
times the outside diameter. In no
case shall bend radius of group,
bundle or harness be less than 10
times the outside diameter of largest
included single wire.
(d). Minimum radius of bend for a coaxial
cable shall not adversely affect the
characteristics of cable, and shall be
no less than 6
times the outside
diameter.