E2-2h02 4851903 0009008 8 A-90-a0 2042 (TSO NTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOIHAS OPTAHI3ALI IO CTAHIAPTH3ALIHI.ORGANISATION INTERNATIONALE DE NORMALISATION Aircraft electrical circuit diagrams First edition -- 1973-10-01 UDC 629.7.064.5 (084.2) : 744.43 Ref. No. 1SO 2042-1973 (E) 1973 ( anionforstatardizaiaircraft, electric circuits, wiring diagrams, drawings. pyrig orking permitted without license from IHS Not for Resale E2-2h02 0 6006000 E06T59h FOREWORD IsO (the International Organization for Standardization) is a woridwide federation of national standards institutes (lsO Member Bodies). The work of developing International Standards is carried out through isO Technica! Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governmental and non-governmental, in liaison with IsO, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the Iso Council. International Standard ISO2042 was drawn up byTechnical Committee ISO/Tc 20, Aircraft and space vehicles, and circulated to the Member Bodies in June 1970. It has been approved by the Member Bodies of the following countries : Greece Australia South Africa, Rep. of India Belgium Spain Canada Israel Switzerland Japan Czechoslovakia Turkey Egypt, Arab Rep of Netherlands United Kingdom France New Zealand U.S.A. No Member Body expressed disapproval of the document. @ International Organization for Standardization, 1973 Printed in Switzerland omIHS Not for Resale E2-2h02 9 0T06000 E06T59h ISO 2042-1973 (E) INTERNATIONAL STANDARD Aircraft electrical circuit diagrams 1 SCOPEAND FIELD OFAPPLICATION 3.4 Lines shall be sharp and dense to obtain good reproduction. As most diagrams will be altered in size on This Internationat Standard provides for uniformity in the reproduction, no exact thickness of line is specified. preparation of aircraft electrical diagrams to permit the greatest ease of drawing consistent with the need for clear definition and legibility. It is intended that these drawings should be of a format suitable for use as production 4 LAYOUT drawings or for reproduction in wiring diagram manuals. In general, electrical diagrams should preferabiy be laid out with the power supplies either at the left or top of the A diagram illustrating the application of the principles laid drawing. down in this Internationa! Standard is shown in the Annex. 2 SYMBOLS 5 CIRCUIT CONDITION Symbols used in the preparation of aircraft electrical 5.1 Electrical diagramsshallbedrawninthe diagrams shall be selected from those in the appropriate "aircraft-on-the-ground" conditions with the main power booklet comprising IEC Publication 117, Recommended off. In general, ali switches should be off and all relays, graphical symbols.1) solenoids and contactors shown in their de-energized state. Circuit-breakers shall be drawn in their closed condition. 3 PRESENTATION 5.2 Should it be necessary to deviate from this form of presentation, a note should be added to define clearly the 3.1 Electrical diagrams shall be drawn to a size suitable for state of the aircraft as applied to the particular diagram. reproduction, in accordance with the appropriate national For example, for automatic pilot cut-out switches, such a standard. note might read : NOTE - Afl dimensions quoted in this International Standard relate Aircraft system in take-off state tosheets thaniso sizeA3（297mmX420mm 11.69 in X16.54 in) and should be proportionately increased in Main power on larger sheets. Flaps down, elevator gear change "in coarse" 3.2 If a complex component appears more than once on a diagram it is only necessary to draw the symbol once. Repetitions of the component may be in the form of a box 6 TITLES with the ap