Document ID: chunk:federal_register_of_legislation:F2022C00213:front:0:p21
Version: federal_register_of_legislation:F2022C00213
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Character Range: 56645–61484

of production when manufacturer's statistical data is available.

        9.3.2.1. The following sections describe the procedure to be used to verify the CO2 conformity of production requirements when the manufacturer's production standard deviation is satisfactory.

        9.3.2.2. With a minimum sample size of three the sampling procedure is set so that the probability of a lot passing a test with 40 per cent of the production defective is 0.95 (producer's risk = 5 per cent) while the probability of a lot being accepted with 65 per cent of the production defective is 0.1 (consumer's risk = 10 per cent).

        9.3.2.3. The following procedure is used (see figure 1):

         Let L be the natural logarithm of the CO2 type approval value:

             xI = the natural logarithm of the measurement for the i-th vehicle of the sample;

             s = an estimate of the production standard deviation (after taking the natural logarithm of the measurements);

             n = the current sample number.

        9.3.2.4. Compute for the sample, the test statistic quantifying the sum of the standardized deviations to the limit and defined as:

        9.3.2.5. Then:

        9.3.2.5.1. if the test statistic is greater than the pass decision number for the sample given in table 1, a pass decision is reached;

        9.3.2.5.2. if the test statistic is less than the fail decision number for the sample size given in table 1, a fail decision is reached;

        9.3.2.5.3. otherwise, an additional vehicle is tested according to Annex 6 and the procedure is applied to the sample with one unit more.

        Table 1

 Sample Size                                     Pass Decision No.          Fail Decision No.
 (cumulative number of vehicles tested)

        (a)                                      (b)                        (c)

        3                                        3.327                      - 4.724
        4                                        3.261                      - 4.790
        5                                        3.195                      - 4.856
        6                                        3.129                      - 4.922
        7                                        3.063                      - 4.988
        8                                        2.997                      - 5.054
        9                                        2.931                      - 5.120
        10                                       2.865                      - 5.185
        11                                       2.799                      - 5.251
        12                                       2.733                      - 5.317
        13                                       2.667                      - 5.383
        14                                       2.601                      - 5.449
        15                                       2.535                      - 5.515
        16                                       2.469                      - 5.581
        17                                       2.403                      - 5.647
        18                                       2.337                      - 5.713
        19                                       2.271                      - 5.779
        20                                       2.205                      - 5.845
        21                                       2.139                      - 5.911
        22                                       2.073                      - 5.977
        23                                       2.007                      - 6.043
        24                                       1.941                      - 6.109
        25                                       1.875                      - 6.175
        26                                       1.809                      - 6.241
        27                                       1.743                      - 6.307
        28                                       1.677                      - 6.373
        29                                       1.611                      - 6.439
        30                                       1.545                      - 6.505
        31                                       1.479                      - 6.571
        32                                       - 2.112                    - 2.112

        9.3.3. Conformity of production when manufacturer's statistical data is unsatisfactory or unavailable.

        9.3.3.1. The following sections describe the procedure to be used to verify the CO2 conformity of production requirements when the manufacturer's evidence of production standard deviation is either unsatisfactory or unavailable.

        9.3.3.2. With a minimum sample size of three the sampling procedure is set so that the probability