SCHEDULE 1(Annex 1 to Directive 97/68/EC)SCOPE, DEFINITIONS, SYMBOLS, ABBREVIATIONS, ENGINE MARKINGS, SPECIFICATIONS AND TESTS, SPECIFICATION OF CONFORMITY OF PRODUCTION ASSESSMENTS, PARAMETERS DEFINING THE ENGINE FAMILY, CHOICE OF THE PARENT ENGINE
SPECIFICATION OF CONFORMITY OF PRODUCTION ASSESSMENTS
5.3.2. When the quality level appears unsatisfactory or when it seems necessary to verify the validity of the data presented in application of section 4.2, the following procedure is adopted: