Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:32
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 32
Character Range: 152848–154677

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           Appendix 3 Procedure for production conformity testing at manufacturer's request
A.3.1. This appendix describes the procedure to be used to verify, at the manufacturer's request, production conformity for the emissions of pollutants.
A.3.2. 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 per cent of the engines defective is 0.90 (producer's risk = 10 per cent) while the probability of a lot being accepted with 65 per cent of the engines defective is 0.10 (consumer's risk = 10 per cent).
A.3.3. The following procedure is used for each of the pollutants given in paragraph 5.3. of this Regulation (see Figure 1 in paragraph 8.3. of this Regulation):
 Let:
n = the current sample number.
A.3.4. Determine for the sample the test statistic quantifying the cumulative number of nonconforming tests at the nth test.
A.3.5. Then:
(a) If the test statistic is less than or equal to the pass decision number for the sample size given in Table 4, a pass decision is reached for the pollutant;
(b) If the test statistic is greater than or equal to the fail decision number for the sample size given in Table 4, a fail decision is reached for the pollutant;
(c) Otherwise, an additional engine is tested according to paragraph 8.3.2. of this Regulation and the calculation procedure is applied to the sample increased by one more unit.
 In Table 4 the pass and fail decision numbers are calculated by means of the International Standard ISO 8422/1991.
       Table 4
       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