1.1 This part of ISO 8668 specifies the general operating characteristics and standardization principles of terminal junction systems in aircraft. It does not define a specific pattern for the connection system from the point of view of dimensions, but lays down limits for the design and performance for each system. 1.2 This part of ISO 8668 lays down the basic requirements for the mechanical structure and electrical performances of terminal junction systems as well as the basic environmental conditions in service. 1.3 ISO 8668/2 gives details of the tests referred to in this part of ISO 8668. NOTE — In order for a series of terminal junction systems to be considered in conformity with ISO 8668, it is necessary to prepare a detail specification for each specific type of system. Detail specifications will be published as subsequent parts of ISO 8668 and will deal with the following aspects: a) sufficiently dimensioned drawings to ensure interchangeability; b) environmental conditions, electrical performance and mechanical requirements; c) drawings and illustrations of the gauges and tools necessary for the tests; d) a complete description of the type designations; e) type approval tests, type approval maintenance tests, production acceptance tests and production quality tests, together with the frequency of testing and severity of inspection levels; f) a declaration of performances and restrictions of use; g) any restrictions or variances from the general characteristic requirements stated in this part of ISO 8668.