3456 NTERNATIONAL STANDARD (Tso INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKIyHAPOIHAg OPrAHW3AlIWS HO CTAHIAPTH3AHH.ORGANISATION INTERNATIONALE DE NORMALISATION Aircraft - Lever-operated manual switches (Class 3) - Performance requirements Aeronefs -- Interrupteurs a levier a commande manuelle (classe 3) -- Caracteristiques First edition -. 1975-12-01 SO 3456-1975 (E) Ref. No. ISO 3456-1975 (E) UDC 629.7.064.5 : 621.316.542.1 Descriptors : aircraft equipment, aircraft controls, manual controls, toggle switches. Price based on 6 pages Copyright International Organization for Standardization ted without license from IHS Not for Resale FOREWORD Iso (the International Organization for Standardization) is a worldwide federation of national standards institutes (IsO Member Bodies). The work of developing International Standards is carried out through isO Technical 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 ISO 3456 was drawn up by Technical Committee ISO/TC 20, Aircraft and space vehicles, and circulated to the Member Bodies in August 1974. Poland United Kingdom Australia Belgium U.S.A. Romania Canada South Africa, Rep. of U.S.S.R. Germany Spain Yugoslavia Turkey Mexico The Member Bodies of the foliowing countries expressed disapproval of the document on technical grounds : France Italy @ International Organization for Standardization, 1975 : Printed in Switzerland Not for Resale ted without license from IHS ISO 3456-1975 (E) INTERNATIONAL STANDARD Aircraft -- Lever-operated manual switches (Class 3) - Performance reguirements 1 SCOPE AND FIELD OF APPLICATION 3 DESIGN REQUIREMENTS 1.1 This international Standard specifies the performance 3.1 The switch shall be suitable for use at altitudes up to and triple-hole mounting, reguirements forsingle- + 7o c, and shall not suffer damage or deterioration when lever-operated manual switches Class 3 for use in nominal 28 V d.c. and 115/200 V three-phase, 400 Hz a.c. systems to + 85 °c. in aircraft. 3.2 The switch shall be suitable for mounting through the 1.2 The switches are environmentally sealed and suitable panel from the rear and shall operate satisfactorily when for higher altitude and temperature conditions than are mounted in any attitude. Other methods of mounting are Class 2 switches which are sealed only at the lever entry. permissible if specified in the applicable individual They do not have the positive action features of the Class 1 specification. and Class 2 switches specified in iSO 1466. 3.3 The switch may be the two- or three-position type, 2 REFERENCES with one or more poles; it may be self-retaining and/or spring-return. It should preferably be designed to allow the ISO/R 224, Standard form of declaration of performance incorporation of integral locking of the lever in any or all of aircraft electrical equipment. positions. Iso 1466, Lever-operated manual switches for aircraft - Performance requirements. 3.4 The method of operation of the switch shall be by means of a single lever, moving in a plane perpendicular to ISo 1540, Aircraft - Electrical power systems -- Charac- the mounting panel. The relationship of the fever positions teristics. 1) to the keyways, and the relationship of the terminal IsO 3282, Aircraft - Dimensions for single- and triple-hole numbers to the lever positions shall be stated in the mounting (Class 3) lever-operated switches. 1) individual specification. Environmental tests for aircraft equipment : 3.5 The switch terminals shall be identified by number in the sequence shown in the individual specification. Iso2650