ASTM F2639 - 15

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

    Active Standard ASTM F2639 | Developed by Subcommittee: F39.01

    Book of Standards Volume: 15.11


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    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 defined in this practice are intended to provide acceptable guidance for modification of general aviation aircraft. Design of any modification shall follow the practices and processes defined in the design sections of this practice.

    4.3 Certification—Certification guidance provided in this practice is intended to provide generally accepted procedures and processes for certification of original and modified electrical systems and equipment. Requirements for certification shall be coordinated with the applicable National Aeronautics Association/Civil Aeronautics Administration (NAA/CAA) regulatory agency.

    1. 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 and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    F2490 Guide for Aircraft Electrical Load and Power Source Capacity Analysis

    ANSI Standards

    ANSI/EIA-5200000 Generic Specification for Special-Use Electromechanical Switches of Certified Quality

    ANSI EIA/TIA-568-B Commercial Building Telecommunications Cabling Standard

    ANSI J-STD-004


    ICS Code

    ICS Number Code 49.060 (Aerospace electric equipment and systems)

    UNSPSC Code

    UNSPSC Code 25202000(Aircraft power systems)


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/F2639-15

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM F2639-15, Standard Practice for Design, Alteration, and Certification of Aircraft Electrical Wiring Systems, ASTM International, West Conshohocken, PA, 2015, www.astm.org

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