ASTM_F_2639_-_15.pdf

Designation:F263915Standard Practice forDesign,Alteration,and Certification of Aircraft ElectricalWiring Systems1This standard is issued under the fixed designation F2639;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 DefinitionThis practice defines acceptable practicesand processes for the design,alteration,and certification ofelectric systems and installations in general aviation aircraft.This practice does not change or create any additional regula-tory requirements nor does it authorize changes in or permitdeviations from existing regulatory requirements.1.2 ApplicabilityThe guidance provided in this practice isdirected to air carriers,air operators,design approval holders,Supplemental Type Certificate(STC)holders,maintenanceproviders,repair stations,and anyone performing field ap-proval modifications or repairs.1.3 Protections and CautionsThis practice provides guid-ance for developing actions and cautionary statements to beadded to maintenance instructions for the protection of wireand wire configurations.Maintenance personnel will use theseenhanced procedures to minimize contamination and acciden-tal damage to electrical wiring interconnection system(EWIS)while working on aircraft.1.4“Protect and Clean As You Go”PhilosophyThisphilosophy is applied to aircraft wiring through inclusion inoperatorsmaintenance and training programs.This philosophystresses the importance of protective measures when workingon or around wire bundles and connectors.It stresses howimportant it is to protect EWIS during structural repairs,STCinstallations,or other alterations by making sure that metalshavings,debris,and contamination resulting from such workare removed.1.5 This practice includes the following sections:TitleSectionWire Selection5General5.1Aircraft Wire Materials5.2Table of Acceptable Wires5.3Severe Wind and Moisture Problems(SWAMP)5.4Grounding and Bonding5.5Electrical Wire Chart5.6Wire and Cable Identification6General6.1Wire and Cable Identification6.2Types of Markings6.3Sleeve and Cable Marker Selection6.4Placement of Identification Markings6.5Wiring Installation7General7.1Wire Harness Installation7.2Power Feeders7.3Service Loops7.4Drip Loops7.5Soldering7.6Strain Relief7.7Grounding and Bonding7.8Splicing7.9Fuel Tank Wiring7.10Corrosion Preventative Compounds(CPC)(MIL-C-81309)7.11Electrical Load Considerations8General8.1Methods for Determining the Current-CarryingCapacity of Wires8.2Acceptable Means of Monitoring andControlling the Electrical Load8.3Electrical System Components9General9.1Alternators9.2Generators9.3Ground Power Units9.4Auxiliary Power Units9.5Batteries9.6Circuit Protection Devices9.7Conduit9.8Connectors9.9Inverters and Power Converters9.10Junctions9.11Junction Boxes9.12Electronic Assemblies9.13Relays9.14Studs9.15Switches9.16Terminals and Terminal Blocks9.17Waveguides9.18Electrical System Component Installation10General10.1Alternators10.2Generators10.3Auxiliary Power Units(APUs)10.4Batteries10.5Circuit Protection Devices10.6Conduit10.7Connectors10.8Inverters and Power Converters10.91This practice is under the jurisdiction of ASTM Committee F39 on AircraftSystems and is the direct responsibility of Subcommittee F39.01 on Design,Alteration,and Certification of Electrical Systems.Current edition approved Aug.1,2015.Published September 2015.Originallyapproved in 2007.Last previous edition approved in 2007 as F2639 071.DOI:10.1520/F2639-15.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 Junctions10.10Junction Boxes,Panels,Shields,andMicroswitch Housings10.11PC Board Assemblies10.12Relays10.13Studs10.14Switches10.15Terminals and Terminal Blocks10.16Waveguides10.17EMI/RFI11General11.1Grounding and Bonding11.2HIRF11.3Lightning11.4Alterations12General12.1Wire Substitutions12.2Commercial Off-the-Shelf(COTS)Components12.3Electrical Load Considerations12.4Batteries12.5Circuit Breakers12.6Junction Boxes12.7Relays12.8Switches12.9Wire Marking12.10Wire Bundle Routing12.11Wire Bundle Combing12.12Interference Tests12.13System Safety Assessments12.14Certification Processes13General13.1Certification13.2Alterations and Maintenance13.31.6 ValuesThe values given in inch-pound units are to beregarded as the standard.The values in parentheses are forinformation only.See Appendix X2 for SI-based prefixes andpowers of 10.NOTE1Where SI units are required,refer to Annex 5 of ICAO.1.7 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 Unless approved by the adminis