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 | 11-96. General
AC 43.13-1B CHG 1
9/27/01
n. Ensure cable supports do not restrict
the wires or cables in such a manner as to in-
terfere with operation of equipment shock
mounts.
o. Do not use tape, tie straps, or cord for
primary support.
p. Make sure that drain holes are pres-
ent in drip loops or in the lowest portion of
tubing placed over the wiring.
q. Ensure that wires and cables are
routed in such a manner that chafing will not
occur against the airframe or other compo-
nents.
r. Ensure that wires and cables are po-
sitioned in such a manner that they are not
likely to be used as handholds or as support for
personal belongings and equipment.
s. Ensure that wires and cables are
routed, insofar as practicable, so that they are
not exposed to damage by personnel moving
within the aircraft.
fuel, or oxygen line, fuel tank wall, or other
low voltage wiring that enters a fuel tank and
requires electrical isolation to prevent an igni-
tion hazard. Where 6 inch spacing cannot
practically be provided, a minimum of 2 inches
must be maintained between wiring and such
lines, related equipment, fuel tank walls and
low voltage wiring that enters a fuel tank.
Such wiring should be closely clamped and
rigidly supported and tied at intervals such that
contact betwe4en such lines, related equip-
ment, fuel tank walls or other wires, would not
occur, assuming a broken wire and a missing
wire tie or clamp.
x. Ensure that a trap or drip loop is
provided to prevent fluids or condensed mois-
ture from running into wires and cables
dressed downward to a connector, terminal
block, panel, or junction box.
y. Wires and cables installed in bilges
and other locations where fluids may be
trapped are routed as far from the lowest point
as possible or otherwise provided with a
moisture-proof covering.
t. Ensure that wires and cables are lo-
cated so as not to be susceptible to damage by
the storage or shifting of cargo.
u. Ensure that wires and cables are
routed so that there is not a possibility of dam-
age from battery electrolytes or other corrosive
fluids.
v. Ensure that wires and cables are ade-
quately protected in wheel wells and other ar-
eas where they may be exposed to damage
from impact of rocks, ice, mud, etc. (If re-
routing of wires or cables is not practical, pro-
tective jacketing may be installed). This type
of installation must be held to a minimum.
w. Where practical, route electrical wires
and cables above fluid lines and provide a 6
inch separation from any flammable liquid,
z. Separate wires from high-temperature
equipment, such as resistors, exhaust stacks,
heating ducts, etc., to prevent insulation break-
down. Insulate wires that must run through
hot areas with a high-temperature insulation
material such as fiberglass or PTFE. Avoid
high-temperature areas when using cables
having soft plastic insulation such as polyeth-
ylene, because these materials are subject to
deterioration and deformation at elevated tem-
peratures. Many coaxial cables have this type
of insulation.
aa. The minimum radius of bends in
wire groups or bundles must not be less than
10 times the outside diameter of the largest
wire or cable, except that at the terminal strips
where wires break out at terminations or re-
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