ISO INTERNATIONAL STANDARD 11 Second edition 1987-02-01 INTERNATIONALORGANIZATIONFORSTANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXKAYHAPOAHAAOPTAHM3ALMAOCTAHAAPTW3ALMM Aircraft - Ground pressure testing connections for pressure cabins Aeronefs -- Raccords pour essais de pressurisation au sol de la cabine des aeronefs rencynotguaranteedwhenprinted Reference number ISO 11 : 1987 (E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (iso member bodies). The work of preparing International Standards is normally carried out throughIso technical committees.Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental 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. They are approved in accordance with ISo procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 11 was prepared by Technical Committee ISO/TC 20, Aircraft and space.vehicles. This second edition cancels and replaces the first edition (Iso 11 : 1980), of which it constitutes a minor revision. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latestedition,unlessotherwisestated. guaran InternationalOrganizationforStandardization,1987 Printed in Switzerland INTERNATIONALSTANDARD ISO 11 :1987 (E) Aircraft - Ground pressure testing connections for pressure cabins Scope and field of application 2 Reference This International Standard specifies the basic dimensional and ISo725, /so inch screw threads--Basic dimensions. access clearancerequirements forpressuretesting connections on pressurized aircraft for coupling with the hose unit or adap- tor of ground pressurizing equipment. Three sizes of connec- 3 Requirements tion are specified as follows : 3.1 Basic dimensions Connection bore Recommended cabin volume The basic dimensions of the connections shall conform to the requirements of the figure. 22,22 mm1) (0.875 in) Not exceeding 10 m3 (300 ft3) 3.2 Access clearance 46,04 mm (1.812 5 in) 10to45m3(300to1500ft3) The clearance allowed around the connections shall be in 72,39 mm (2.85 in) 45 to 170 m3 (1 500 to 6 000 ft3) accordance with the figure. 1