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l. Testing of the electrical and chemical integrity of the insulation of sample wires taken from
areas of the aircraft that have experienced wiring problems in the past, can be used to supplement
visual examination of the wire. The test for chemical integrity should be specific for the
degradation mode of the insulation. If the samples fail either the electrical or chemical integrity
tests, then the wiring in the area surrounding the sampling area is a candidate for replacement.
2. ADVANCEMENT HANDBOOK FOR AVIATION ELECTRICIANS MATE (AE),
10/15/2001
Comment: There is no information pertaining to mixing of dissimilar wire types in bundles.
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3. DEPARTMENT OF TRANSPORTATION, FEDERAL AVIATION
ADMINISTRATION, POLICY STATEMENT NUMBER ANM-01-04; SYSTEM WIRING
POLICY FOR CERTIFICATION OF PART 25 AIRPLANES: 01/28/02
Bullet in paragraph 4 of section titled “Disposition of Comments”
Comment: Issues relating to the mixing of wire types are not addressed. Mixing of wire types is
not addressed in this policy statement. Wires in a bundle must be securely clamped and bound
and be compatible with their environment (i.e., vibration, temperature, etc.). These details are
addressed in the design and installation requirements of the wire. These requirements are called
out in the installation drawings.
4. ITSS (MATMEP) F/A-18 DUTY AREA, AIRCRAFT ELECTRICAL TECHNICIAN
(MOS 6337): 08/2002
Comment: There is no information pertaining to mixing of dissimilar wire types in bundles.
5. MIL-E-5400T, ELECTRONIC EQUIPMENT, AEROSPACE, GENERAL
SPECIFICATION FOR: 11/16/79
Comment: There is no information pertaining to mixing of dissimilar wire types in bundles.
6. MIL-HDBK-5400, ELECTRONIC EQUIPMENT, AIRBORNE, GENERAL
GUIDELINES FOR: 11/30/95
Comment: There is no information pertaining to mixing of dissimilar wire types in bundles.
7. MIL-HDBK-454, GENERAL GUIDELINES FOR ELECTRONIC EQUIPMENT,
(GUIDELINE 71): 11/03/2000
Comment: There is no information pertaining to mixing of dissimilar wire types in bundles.
8. MIL-W-5088L, WIRING, AEROSPACE VEHICLE: 05/10/91
(Same as SAE AS50881A: 04/01/2000)
3.3.4 Commonality. An objective in the selection of parts shall be to maximize commonality
and minimize the variety of wiring components and related servicing tools required in the
construction, installation, and maintenance of the electrical wiring system.
9. SAE ARP4404 REV A, AIRCRAFT ELECTRICAL INSTALLATIONS: 07/01/2002
PAGES 52-53
9.1 General
The selection of proper type and size of wire for any aircraft circuit is as important as selecting
the proper protector for the wire. Improper wire selection, either as to type, size, or poor wire
routing can make an otherwise good electrical system unsafe.
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AS50881 covers aspects of wire selection for military aerospace vehicles and is normally used as
a guide for many commercial programs. This document is maintained on a current basis through
coordinated industry and military activities and should be used as a reference. Detail data is
included for current ratings, altitude derating, corona considerations, and list of approved wire
types.
9.2 Wire Type Selection
SAE AS4372 and SAE AS4373 are recommended for the evaluation and proposed selection of
wire constructions not listed in AS50881
In the repair and modification of existing aircraft, when replacement wire is required, the
maintenance manual for that aircraft should first be reviewed to determine if the original aircraft
manufacturer (OAM) has approved any substitution. If not, then OAM must be contacted for an
acceptable replacement.
10. ATSRAC STATEMENT OF CONCERN REGARDING WIRE SEPARATION
DESIGN CRITERIA, KENT V. HOLLINGER
08/21/2002
Comment: There is no information pertaining to mixing of dissimilar wire types in bundles.
11. ATSRAC TASK 6: WIRE SYSTEMS, CERTIFICATION REQUIREMENTS,
HARMONIZATION WORKING GROUP: FINAL REPORT TO ASTRAC: 10/29/2002
Page B-7 (iv)
Wire installed in the same bundle shall be able to withstand the wire-to-wire abrasion. The
Routing of wires with dissimilar insulation, within the same bundle, is not generally
recommended, particularly when relative motion and abrasion between wires having dissimilar
insulation could occur.
12. AIRCRAFT CIRCULAR, DEVELOPMENT OF ELECTRICAL STANDARD
WIRING DOCUMENTATION: 10/28/02
Appendix A and Appendix B.
Comment: Tables in each Appendix include the following Major Topic:
WIRE AND CABLE TYPES
The principle material component of airplane wiring; includes type identification and basic
description; alternative wire types (replacements, substitutions).
13. FINAL REPORT, ATSRAC HWG TASK 7, ELECTRICAL STANDARD WIRE
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