493 (ISO NTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKIyHAPOIHA OPFAHW3ALIWG IO CTAHIAPTW3ALIWIN.ORGANISATION INTERNATIONALE DE NORMALISATION Aircraft - Dimensions for single-hole mounting (Class 1 and Class 2) lever-operated manual switches First edition -- 1975-05-01 ISO 493-1975 (E) Ref. No. ISO 493-1975 (E) UDC 629.7 : 621.316.54 Descriptors : aircraft, switches, manual controls, dimensions. Price based on 1 page Copyright Interna national 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 493 was drawn up by Technical Committee ISO/TC 20 Aircraft and space vehicles, and circulated to the Member Bodies in November 1973. It has been approved by the Member Bodies of the following countries : Netherlands Turkey Belgium United Kingdom Canada New Zealand Czechoslovakia U.S.A. Poland Egypt, Arab Rep. of U.S.S.R. Romania Germany South Africa, Rep. of Yugoslavia Italy Spain Japan Thailand The Member Body of the following country expressed disapproval of the document on technical grounds : France ISO Recommendation This International Standard cancels and replaces R 493-1966, of which it constitutes a technical revision. @ International Organization for Standardization, 1975 : Printed in Switzerland ted without license from IHS Not for Resale ISO 493-1975 (E) INTERNATIONAL STANDARD Aircraft - Dimensions for single-hole mounting (Class 1 and Class 2) lever-operated manual switches locates in a keyway in the switch mounting bush, shall be 1 SCOPE AND FIELD OF APPLICATION used to prevent rotation of the switch, and shall orientate This International Standard gives the overall dimensions for the switch correctly. single-hole mounting (Class 1 and Class 2) lever-operated switches having the characteristics specified in 1s0 1466, TABLE - Dimensions Lever-operated manual switches for aircraft -- Performance requirements. Dimension mm in A 48,3 max. 1.9 max. Single-pole 16,8 max. 0.66 max. 2 DIMENSIONAL REQUIREMENTS Doubie-pole 22,6 max. 0.89 max. 2.1 The overall dimensions shall be in accordance with B 1.38 max. those shown in figure 1 and the table, which are suitable for 35,1 max. Three-pole accommodating either terminal screws or integrated 1.81 max. Four-pole 46,0 max. terminal ("poke-home" connections) on the face opposite the mounting bush. c 34,3 max. 1.35 max. D 12,3 max. 0.484 max. 2.2 The switch shall have at the centre of the front face of E* 23,8 ± 1,6 0.938 ± 0.06 the case a 12 mm diameter male thread of 1 mm or 20° ± 2° equivalent pitch for fixing to the mounting panel. The holes 0 in the mounting panel for fixing the switch to the pane! shall be as shown in figure 1a). The smaller hole, of A lever length of 17,5 ± 0,8 mm (0.688 ± 0 03 in) is acceptable, diameter 3 mm, together with a keyway washer, which also but non-preferred. 3 mm (0.12 in) min. Φ 12,5 mm (0.492 in) FIGURE 1 -- Dimensions for single-hole mounting switch FIGURE 1a) - Panel drilling Copyright International Organization for Standardization sefrom IHS Not for Resa