ASTM F2639-15
(Practice)Standard Practice for Design, Alteration, and Certification of Aircraft Electrical Wiring Systems
Standard Practice for Design, Alteration, and Certification of Aircraft Electrical Wiring Systems
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.
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 ...
General Information
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Designation:F2639 −15
Standard Practice for
Design, Alteration, and Certification of Aircraft Electrical
1
Wiring Systems
This standard is issued under the fixed designation F2639; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
Grounding and Bonding 5.5
Electrical Wire Chart 5.6
1.1 Definition—This practice defines acceptable practices
Wire and Cable Identification 6
and processes for the design, alteration, and certification of General 6.1
Wire and Cable Identification 6.2
electric systems and installations in general aviation aircraft.
Types of Markings 6.3
This practice does not change or create any additional regula-
Sleeve and Cable Marker Selection 6.4
tory requirements nor does it authorize changes in or permit Placement of Identification Markings 6.5
Wiring Installation 7
deviations from existing regulatory requirements.
General 7.1
Wire Harness Installation 7.2
1.2 Applicability—The guidance provided in this practice is
Power Feeders 7.3
directed to air carriers, air operators, design approval holders,
Service Loops 7.4
Supplemental Type Certificate (STC) holders, maintenance
Drip Loops 7.5
Soldering 7.6
providers, repair stations, and anyone performing field ap-
Strain Relief 7.7
proval modifications or repairs.
Grounding and Bonding 7.8
Splicing 7.9
1.3 Protections and Cautions—This practice provides guid-
Fuel Tank Wiring 7.10
ance for developing actions and cautionary statements to be
Corrosion Preventative Compounds (CPC) 7.11
(MIL-C-81309)
added to maintenance instructions for the protection of wire
Electrical Load Considerations 8
and wire configurations. Maintenance personnel will use these
General 8.1
enhanced procedures to minimize contamination and acciden-
Methods for Determining the Current-Carrying 8.2
Capacity of Wires
tal damage to electrical wiring interconnection system (EWIS)
Acceptable Means of Monitoring and 8.3
while working on aircraft.
Controlling the Electrical Load
Electrical System Components 9
1.4 “Protect and Clean As You Go” Philosophy—This
General 9.1
philosophy is applied to aircraft wiring through inclusion in
Alternators 9.2
operators’maintenanceandtrainingprograms.Thisphilosophy
Generators 9.3
Ground Power Units 9.4
stresses the importance of protective measures when working
Auxiliary Power Units 9.5
on or around wire bundles and connectors. It stresses how
Batteries 9.6
important it is to protect EWIS during structural repairs, STC
Circuit Protection Devices 9.7
Conduit 9.8
installations, or other alterations by making sure that metal
Connectors 9.9
shavings, debris, and contamination resulting from such work
Inverters and Power Converters 9.10
are removed. Junctions 9.11
Junction Boxes 9.12
1.5 This practice includes the following sections:
Electronic Assemblies 9.13
Relays 9.14
Title Section
Studs 9.15
Wire Selection 5
Switches 9.16
General 5.1
Terminals and Terminal Blocks 9.17
Aircraft Wire Materials 5.2
Waveguides 9.18
Table of Acceptable Wires 5.3
Electrical System Component Installation 10
Severe Wind and Moisture Problems (SWAMP) 5.4
General 10.1
Alternators 10.2
Generators 10.3
1
Auxiliary Power Units (APUs) 10.4
This practice is under the jurisdiction of ASTM Committee F39 on Aircraft
Batteries 10.5
Systems and is the direct responsibility of Subcommittee F39.01 on Design,
Circuit Protection Devices 10.6
Alteration, and Certification of Electrical Systems.
Conduit 10.7
Current edition approved Aug. 1, 2015. Published September 2015. Originally
ϵ1 Connectors 10.8
approved in 2007. Last previous edition approved in 2007 as F2639–07 . DOI:
Inverters and Power Converters 10.9
10.1520/F2639-15.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F2639−15
4
2.4 FAA Standards:
Junctions 10.10
Junction Boxes, Panels, Shields, and 10.11
Advisory Circular 20-53AProtection of Aircraft Fuel Sys-
Microswitch Housings
tems Against Fuel Vapor Ignition Due To Lightning
PC Board Assemblies 10.12
AC 20-136Protection of Aircraft Electrical/Electronic Sys-
Relays 10.13
Studs 10.14
tems Against the Indirect Effects of Lightning
Switches 10.15
AC 21-160ERTCA Document DO-160E
Terminals and Terminal Blocks 10.16
AC 23.1309-1CEquipment, Systems, and Installations in
Waveguides 10.17
EMI/RFI 11
Part 23 Airplanes
General 11.1
AC 25-16Electrical Fault and Fire Prevention and Protec-
Grounding and Bonding 11.2
HIRF 11.3 tion
Lightning 11.4
AC 25.869-1Electrical System Fire and Smoke Protection
Alterations 12
AC25.981-1BFuelTankIgnitionSourcePreventionGuide
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: F2639 − 07 F2639 − 15
Standard Practice for
Design, Alteration, and Certification of AirplaneAircraft
1
Electrical Wiring Systems
This standard is issued under the fixed designation F2639; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1
ε NOTE—Added 1.5 editorially in September 2012.
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
1
This practice is under the jurisdiction of ASTM Committee F39 on Aircraft Systems and is the direct responsibility of Subcommittee F39.01 on Design, Alteration, and
Certification of Electrical Systems.
Current edition approved Sept. 1, 2007Aug. 1, 2015. Published October 2007September 2015. Originally approved in 2007. Last previous edition approved in 2007 as
ɛ1
F2639 – 07 . DOI: 10.1520/F2639-07E01.10.1520/F2639-15.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F2639 − 15
Corrosion Preventative Compounds (CPC) 7.11
(MIL-C-81309)
Electrical Load Considerations 8
General 8.1
Methods for Determining the Current-Carrying 8.2
Capacity of Wires
Acceptable Means of Monitoring and 8.3
Controlling the Electrical Load
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 10.11
Microswitch Housings
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
...
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