Specifications

9/27/01 AC 43.13-1B CHG 1
Par 11-78 Page 11-37 (and 11-38)
aerospace applications in open and protected
wiring applications. These wires could poten-
tially be used for substitution when approved
by the OAM.
b. Areas designated as severe wind and
moisture problem (SWAMP) areas differ
from aircraft to aircraft but generally are con-
sidered to be areas such as wheel wells, near
wing flaps, wing folds, pylons, and other exte-
rior areas that may have a harsh environment.
Wires for these applications often have design
features incorporated into their construction
that may make the wire unique; therefore an
acceptable substitution may be difficult, if not
impossible, to find. It is very important to use
the wire type recommended in the aircraft
manufacturer’s maintenance handbook.
c. The use of current military specifica-
tion, multi-conductor cables in place of OEM
installed constructions may create
problems such as color sequence. Some civil-
ian aircraft are wired with the older color se-
quence employing “Red-Blue-Yellow” as the
first three colors. Current military specifica-
tion, multi-conductor cables, in accordance
with MIL-C-27500, use “White-Blue-Orange”
for the initial three colors. Use of an alterna-
tive color code during modification without
adequate notation on wiring diagrams could
severely complicate subsequent servicing of
the aircraft. At the time of this writing,
MIL-C-27500 is being revised to include the
older color sequence and could eliminate this
problem in the future.
11-79.

11-84. [RESERVED.]
Table 11-2b. Comparable properties of wire insulation systems.
Most desirable 

 Least
Relative Ranking 1 2 3 4
Weight PI ETFE COMP PTFE
Temperature PTFE COMP PI ETFE
Abrasion resistance PI ETFE COMP PTFE
Cut-through resistance PI COMP ETFE PTFE
Chemical resistance PTFE ETFE COMP PI
Flammability PTFE COMP PI ETFE
Smoke generation PI COMP PTFE ETFE
Flexibility PTFE ETFE COMP PI
Creep (at temperature) PI COMP PTFE ETFE
Arc propagation resistance PTFE ETFE COMP PI