Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:4:p42
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 4 (pt 42/42)
Character Range: 124910–126633

pollutants.

         2.      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 %).

         3.      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.
         4.      Calculate for the sample the test statistic quantifying the number of non-conforming engines, i.e. xi ≥ L.

         5.      Then:

           —    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.

         In Table 5 the pass and fail decision numbers are calculated by means of the International Standard ISO 8422/1991.

        Table 5

                    Pass and fail decision numbers of Appendix 3 sampling plan Minimum sample size: 3
      Cumulative number of engines tested (sample size)
                                                              Pass decision number       Fail decision number