FAA Advisory Circular 43.13-1B
Acceptable Methods, Techniques, and Practices
Aircraft Inspection and Repair
AC 43.13-1B | 11. Aircraft Electrical Systems | 8. Wiring Installation Inspection Requirements | 11-97. Wiring Replacement
9/27/01
AC 43.13-1B CHG 1
verse direction in a bundle. Where the wire is
suitably supported, the radius may be 3 times
the diameter of the wire or cable. Where it is
not practical to install wiring or cables within
the radius requirements, the bend should be
enclosed in insulating tubing. The radius for
thermocouple wire should be done in accor-
dance with the manufacturer’s recommenda-
tion and shall be sufficient to avoid excess
losses or damage to the cable.
bb. Ensure that RF cables, e.g., coaxial
and triaxial are bent at a radius of no less than
6 times the outside diameter of the cable.
cc. Ensure that wires and cables, that
are attached to assemblies where relative
movement occurs (such as at hinges and ro-
tating pieces; particularly doors, control sticks,
control wheels, columns, and flight control
surfaces), are installed or protected in such a
manner as to prevent deterioration of the wires
and cables caused by the relative movement of
the assembled parts.
dd. Ensure that wires and electrical ca-
bles are separated from mechanical control ca-
bles. In no instance should wire be able to
come closer than 1/2 inch to such controls
when light hand pressure is applied to wires or
controls. In cases where clearance is less than
this, adequate support must be provided to
prevent chafing.
ee. Ensure that wires and cables are
provided with enough slack to meet the fol-
lowing requirements:
(1) Permit ease of maintenance.
(2) Prevent mechanical strain on the
wires, cables, junctions, and supports.
(4) Allow shifting of equipment, as
necessary, to perform alignment, servicing,
tuning, removal of dust covers, and changing
of internal components while installed in air-
craft.
ff. Ensure that unused wires are indi-
vidually dead-ended, tied into a bundle, and
secured to a permanent structure. Each wire
should have strands cut even with the insula-
tion and a pre-insulated closed end connector
or a 1-inch piece of insulating tubing placed
over the wire with its end folded back and tied.
gg. Ensure that all wires and cables are
identified properly at intervals of not more
than 15 inches. Coaxial cables are identified at
both equipment ends.
11-97. WIRING REPLACEMENT. Wir-
ing must be replaced with equivalent wire (see
paragraph 11-78) when found to have any of
the following defects:
a. Wiring that has been subjected to
chafing or fraying, that has been severely dam-
aged, or that primary insulation is suspected of
being penetrated.
b. Wiring on which the outer insulation is
brittle to the point that slight flexing causes it
to crack.
c. Wiring having weather-cracked outer
insulation.
d. Wiring that is known to have been ex-
posed to electrolyte or on which the insulation
appears to be, or is suspected of being, in an
initial stage of deterioration due to the effects
of electrolyte.
(3) Permit free movement of shock and
vibration mounted equipment.
Par 11-96
Page 11-45