Document ID: chunk:federal_register_of_legislation:F2023L00129:front:0:p52
Version: federal_register_of_legislation:F2023L00129
Segment Type: other
Provision Reference: 
Character Range: 142556–145432

complying to xx series of amendments to UN Regulation No. 49".

              13.4.3.2. In the case of approvals to the special provisions laid down in paragraph 13.4.2. the type approval communication shall include the following text at the front-end of the communication, with the relevant number of the series of amendments replacing the "xx" in the example below:

               "Replacement engine complying to xx series of amendments to UN Regulation No. 49".

              13.4.4.  It is appropriate that modified requirements for the in-service testing according to paragraph 9. do not apply retroactively to engines and vehicles which have not been approved in accordance with those requirements. Therefore, vehicles subject to in-service testing according to paragraph 9. shall always be tested according to the provisions set out in the respective level of this Regulation, which has been applicable at the time of type approval.

              14. Names and addresses of Technical Services responsible for conducting approval tests and of Type Approval Authorities
 The Parties to the 1958 Agreement applying this Regulation shall communicate to the United Nations Secretariat the names and addresses of the Technical Services responsible for conducting approval tests and of the Type Approval Authorities which grant approval and to which forms certifying approval or extension or refusal or withdrawal of approval, issued in other countries, are to be sent.

           Appendix 1 Procedure for production conformity testing when standard deviation is satisfactory
A.1.1. This appendix describes the procedure to be used to verify production conformity for the emissions of pollutants when the manufacturer's production standard deviation is satisfactory.
A.1.2. With a minimum sample size of three engines the sampling procedure is set so that the probability of a lot passing a test with 40 per cent of the engines defective is 0.95 (producer's risk = 5 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.1.3. 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:
L = the natural logarithm of the limit value for the pollutant;
xi = the natural logarithm of the measurement (after having applied the relevant DF) for the i-th engine of the sample;
s = an estimate of the production standard deviation (after taking the natural logarithm of the measurements);
n = the current sample number.

A.1.4. For each sample the sum of the standardized deviations to the limit is calculated using the following formula:
A.1.5. Then:
(a) If the test statistic result is greater than the pass decision number for the sample size given in Table 2, a pass decision is reached