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ASTM International - ASTM F2639-18

Standard Practice for Design, Alteration, and Certification of Aircraft Electrical Wiring Systems

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Organization: ASTM International
Publication Date: 1 October 2018
Status: active
Page Count: 101
ICS Code (Aerospace electric equipment and systems): 49.060
significance And Use:

4.1 Design-The design procedures defined in this practice are intended to provide acceptable guidance in the original design of electrical systems.

4.2 Alteration-The alteration procedures... View More

scope:

1.1 Definition-This practice defines acceptable practices and processes for the design, alteration, and certification of electric systems and installations in general aviation aircraft. This practice does not change or create any additional regulatory requirements nor does it authorize changes in or permit deviations from existing regulatory requirements.

1.2 Applicability-The guidance provided in this practice is directed to air carriers, air operators, design approval holders, Supplemental Type Certificate (STC) holders, maintenance providers, repair stations, and anyone performing field approval modifications or repairs.

1.3 Protections and Cautions-This practice provides guidance for developing actions and cautionary statements to be added to maintenance instructions for the protection of wire and wire configurations. Maintenance personnel will use these enhanced procedures to minimize contamination and accidental damage to electrical wiring interconnection system (EWIS) while working on aircraft.

1.4 "Protect and Clean As You Go" Philosophy-This philosophy is applied to aircraft wiring through inclusion in operators' maintenance and training programs. This philosophy stresses the importance of protective measures when working on or around wire bundles and connectors. It stresses how important it is to protect EWIS during structural repairs, STC installations, or other alterations by making sure that metal shavings, debris, and contamination resulting from such work are removed.

1.5 This practice includes the following sections:

Title Section
Wire Selection 5
 General 5.1
 Aircraft Wire Materials 5.2
 Table of Acceptable Wires 5.3
 Severe Wind and Moisture Problems (SWAMP) 5.4
 Grounding and Bonding 5.5
 Electrical Wire Chart 5.6
Wire and Cable Identification 6
 General 6.1
 Wire and Cable Identification 6.2
 Types of Markings 6.3
 Sleeve and Cable Marker Selection 6.4
 Placement of Identification Markings 6.5
Wiring Installation 7
 General 7.1
 Wire Harness Installation 7.2
 Power Feeders 7.3
 Service Loops 7.4
 Drip Loops 7.5
 Soldering 7.6
 Strain Relief 7.7
 Grounding and Bonding 7.8
 Splicing 7.9
 Fuel Tank Wiring 7.10
 Corrosion Preventative Compounds (CPC)
 (MIL-C-81309)
7.11
Electrical Load Considerations 8
 General 8.1
 Methods for Determining the Current-Carrying
 Capacity of Wires
8.2
 Acceptable Means of Monitoring and
 Controlling the Electrical Load
8.3
Electrical System Components 9
 General 9.1
 Alternators 9.2
 Generators 9.3
 Ground Power Units 9.4
 Auxiliary Power Units 9.5
 Batteries 9.6
 Circuit Protection Devices 9.7
 Conduit 9.8
 Connectors 9.9
 Inverters and Power Converters 9.10
 Junctions 9.11
 Junction Boxes 9.12
 Electronic Assemblies 9.13
 Relays 9.14
 Studs 9.15
 Switches 9.16
 Terminals and Terminal Blocks 9.17
 Waveguides 9.18
Electrical System Component Installation 10
 General 10.1
 Alternators 10.2
 Generators 10.3
 Auxiliary Power Units (APUs) 10.4
 Batteries 10.5
 Circuit Protection Devices 10.6
 Conduit 10.7
 Connectors 10.8
 Inverters and Power Converters 10.9
 Junctions 10.10
 Junction Boxes, Panels, Shields, and
 Microswitch Housings
10.11
 PC Board Assemblies 10.12
 Relays 10.13
 Studs 10.14
 Switches 10.15
 Terminals and Terminal Blocks 10.16
 Waveguides 10.17
EMI/RFI 11
 General 11.1
 Grounding and Bonding 11.2
 HIRF 11.3
 Lightning 11.4
Alterations 12
 General 12.1
 Wire Substitutions 12.2
 Commercial Off-the-Shelf (COTS) Components 12.3
 Electrical Load Considerations 12.4
 Batteries 12.5
 Circuit Breakers 12.6
 Junction Boxes 12.7
 Relays 12.8
 Switches 12.9
 Wire Marking 12.10
 Wire Bundle Routing 12.11
 Wire Bundle Combing 12.12
 Interference Tests 12.13
 System Safety Assessments 12.14
Certification Processes 13
 General 13.1
 Certification 13.2
 Alterations and Maintenance 13.3

1.6 Values-The values given in inch-pound units are to be regarded as the standard. The values in parentheses are for information only. See Appendix X2 for SI-based prefixes and powers of 10.

Note 1: Where SI units are required, refer to Annex 5 of ICAO.

1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

Document History

ASTM F2639-18
October 1, 2018
Standard Practice for Design, Alteration, and Certification of Aircraft Electrical Wiring Systems
1.1 Definition—This practice defines acceptable practices and processes for the design, alteration, and certification of electric systems and installations in general aviation aircraft. This practice...
August 1, 2015
Standard Practice for Design, Alteration, and Certification of Aircraft Electrical Wiring Systems
1.1 Definition—This practice defines acceptable practices and processes for the design, alteration, and certification of electric systems and installations in general aviation aircraft. This practice...
September 1, 2007
Standard Practice for Design, Alteration, and Certification of Airplane Electrical Wiring Systems
1.1 Definition - This practice defines acceptable practices and processes for the design, alteration, and certification of electric systems and installations in general aviation aircraft. This...
September 1, 2007
Standard Practice for Design, Alteration, and Certification of Airplane Electrical Wiring Systems
1.1 Definition—This practice defines acceptable practices and processes for the design, alteration, and certification of electric systems and installations in general aviation aircraft. This practice...
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