Specifies the basic dimensional and access clearance requirements for pressure connections on pressurized aircraft for coupling with the hose unit or adaptor of ground pressurizing equipment. Three sizes of connection are specified 22,22 mm, 46,04 mm and 72,39 mm for the recommended cabin volumes: not exceeding 1O m^3, 1O to 45 m^3 and 45 to 170 m^3.