Effects of Mixed Wire Types

航空

Effects of Mixed Wire Types in Aircraft Electrical Wiring Interconnection Systems

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TABLE OF CONTENTS
Page
EXECUTIVE SUMMARY xiii
1. INTRODUCTION 1
1.1 Purpose 1
1.2 Background 1
1.2.1 Wire Installation 1
1.2.2 Design Options 1
1.2.3 Investigation Reason 1
2. APPROACH 1
3. REVIEW OF DOCUMENTATION 2
3.1 Review of Regulations, Proposed Regulations, and Design Specifications 2
3.2 Aircraft Wiring Practices 2
3.2.1 Original Aircraft Manufacturers Wiring Practices 2
3.2.2 Commercial Maintenance and Operator Wiring Practices 3
3.2.3 Modification Facilities 3
3.2.4 Military Maintenance and Operation Wiring Practices 3
3.3 Review of Service Data 4
3.4 Review of Prior Research and Test Data 4
3.5 Documentation Review Summary 4
4. TEST PROGRAM 4
4.1 Test Plan 5
4.2 Specimen Description 6
4.3 Wire Bundle Configurations 7
4.4 Wire Bundle Combinations 7
4.5 Crush Test Wire Combinations 9
5. DISCUSSION AND RESULTS 10
5.1 Group I Test Results 10
5.1.1 Visual Observations on Mounted Bundles 10
5.1.2 Electrical Testing 10
5.1.3 Wire-to-Wire Wear 11
v
5.1.4 Wire Wear From Clamps 18
5.1.5 Wire Wear From Straps and Lacing String 20
5.1.6 Wire Wear From Vibration Fixture Plate 21
5.1.7 Wear of Support Components 21
5.1.8 Wear of Single Wires vs Twisted Pairs 21
5.2 Group II Test Results 22
5.2.1 Visual Observations 22
5.2.2 Electrical Testing 22
5.2.3 Wire-to-Wire Wear 22
5.2.4 Wire Wear From Clamps 35
5.2.5 Wire Wear From Straps and Lacing String 38
5.2.6 Wire Wear From Vibration Fixture 39
5.2.7 Wear on Support Components 40
5.2.8 Wear of Single Wires Versus Twisted Pairs 40
5.3 Test Groups I and II Comparison 40
5.4 Group III Crush Test Results 41
5.5 Comparison to Previous Data 42
6. SUMMARY AND RECOMMENDATIONS 43
6.1 Summary 43
6.2 Recommendations 43
7. RELATED DOCUMENTATION 44
8. REFERENCES 46
APPENDICES
A—Regulations, Standard Practices, and Previous Test Documentation
B—Test Program
C—Test Data
D—Additional Photographic Documentation
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lazybone9988

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