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the Intrusive Inspection Working Group, 29 December 2000.
2. NAC Report TR-2333, “Testing of Selected Aircraft Electrical Wire Insulations,” 8 June
1983.
3. ATSRAC Task 6 Report, “Wire Systems Certification Requirements Harmonization
Working Group,” 29 October 2002.
4. Douglas Aircraft Company, Engineering Report MDC-J1530/01, “Vibration of DC-10
Wire Bundles,” 19 August 1974.
5. SAE AS4373, “Test Methods for Insulated Electric Wire, Method 703, Dynamic Cut-
Through.”
4 6
APPENDIX A—REGULATIONS, STANDARD PRCTICES, AND
PREVIOUS TEST DOCUMENTATION
Note: Titles of documents and page numbers are in boldface type. Information from documents
is in regular type without quotations. Raytheon remarks and summaries of specific information
are noted as a “comment.”
I. REGULATIONS, PROPOSED REGULATIONS, AND DESIGN SPECIFICATIONS
1. ADVISORY CIRCULAR AC 43.13-1B: ACCEPTABLE METHODS, TECHNIQUES,
AND PRACTICES. AIRCRAFT INSPECTION AND REPAIR SEPTEMBER 8, 1998,
DEPARTMENT OF TRANSPORTATION, FEDERAL AVIATION ADMINISTRATION
Page 11-24
a. Mechanical Strength of Wires. If it is desirable to use wire sizes smaller than #20, particular
attention should be given to the mechanical strength and installation handling of these wires, e.g.,
vibration, flexing, and termination. Wire containing less than 19 strands must not be used.
Consideration should be given to the use of high-strength alloy conductors in small gauge wires
to increase mechanical strength. As a general practice, wires smaller than size #20 should be
provided with additional clamps and be grouped with at least three other wires. They should also
have additional support at terminations, such as connector grommets, strain relief clamps,
shrinkable sleeving, or telescoping bushings. They should not be used in applications where they
will be subjected to excessive vibration, repeated bending, or frequent disconnection from screw
termination.
Page 11-35
Installation Precautions for Small Wires. As a general practice, wires smaller than size #20 must
be provided with additional clamps, grouped with at least three other wires, and have additional
support at terminations, such as connector grommets, strain-relief clamps, shrinkable sleeving, or
telescoping bushings. They should not be used in applications where they will be subjected to
excessive vibration, repeated bending, or frequent disconnection from screw terminations.
Page 11-36
11-78. SUBSTITUTIONS. In the repair and modification of existing aircraft, when a
replacement wire is required, the maintenance manual for that aircraft must first be reviewed to
determine if the original aircraft manufacturer (OAM) has approved any substitution. If not, then
the OAM must be contacted for an acceptable replacement.
a. MIL-W-5088L Wiring, Aerospace Vehicle, Appendix A lists wire types that have been
approved for military aerospace applications in open and protected wiring applications. These
wires could potentially be used for substitution when approved by the OAM.
A-1
Pages 11-45 through 11-46
11-97. WIRING REPLACEMENTS. Wiring 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 damaged, 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 exposed 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.
e. Check wiring that shows evidence of overheating (even if only to a minor degree) for the
cause of the overheating.
f. Wiring on which the insulation has become saturated with engine oil, hydraulic fluid, or
another lubricant.
g. Wiring that bears evidence of having been crushed or severely kinked.
h. Shielded wiring on which the metallic shield is frayed and/or corroded. Cleaning agents or
preservatives should not be used to minimize the effects of corrosion or deterioration of wire
shields.
i. Wiring showing evidence of breaks, cracks, dirt, or moisture in the plastic sleeves placed over
wire splices or terminal lugs.
j. Sections of wire in which splices occur at less than 10-foot intervals, unless specifically
authorized, due to parallel connections, locations, or inaccessibility.
k. When replacing wiring or coaxial cables, identify them properly at both equipment power
source ends.
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