PROCEDURE FOR PRODUCTION CONFORMITY TESTING AT MANUFACTURER'S REQUEST

This Appendix describes the procedure to be used to verify, at the manufacturer's request, production conformity for the emissions of pollutants. With a minimum sample size of three engines the sampling procedure is set so that the probability of a lot passing a test with 30 % of the engines defective is 0,90 (producer's risk = 10 %) while the probability of a lot being accepted with 65 % of the engines defective is 0,10 (consumer's risk = 10 %). The following procedure is used for each of the pollutants given in Section 6.2.1 of Annex I (see Figure 2): | Let: | L = the limit value for the pollutant, xi = the value of the measurement for the i-th engine of the sample, n = the current sample number. Calculate for the sample the test statistic quantifying the number of non-conforming engines, i.e. xi ≥ L. Then: In Table 5 the pass and fail decision numbers are calculated by means of the International Standard ISO 8422/1991. if the test statistic is less than or equal to the pass decision number for the sample size given in Table 5, a pass decision is reached for the pollutant; if the test statistic is greater than or equal to the fail decision number for the sample size given in Table 5, a fail decision is reached for the pollutant; otherwise, an additional engine is tested according to Section 9.1.1.1 of Annex I and the calculation procedure is applied to the sample increased by one more unit. Table 5 Pass and fail decision numbers of Appendix 3 sampling plan Minimum sample size: 3

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Source: EUR-Lex (Cellar) · retrieved 2026-11-01 · Text as adopted (Official Journal); later amendments are not incorporated in this text.