§86.609-96 Calculation and reporting of test results.

Section 86.609-96 includes text that specifies requirements that differ from §86.609-84. Where a paragraph in §86.609-84 is identical and applicable to §86.609-96, this is indicated by specifying the corresponding paragraph and the statement "[Reserved]. For guidance see §86.609-84." Where a corresponding paragraph of §86.609-84 is not applicable, this is indicated by the statement "[Reserved]."

(a) Initial test results are calculated following the test procedures specified in §86.608(a). Round the initial test results to the number of decimal places contained in the applicable emission standard expressed to one additional significant figure. Rounding is done in accordance with ASTM E 29-90, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications. This procedure has been incorporated by reference (see §86.1).

(b) Final test results for each test vehicle are calculated by summing the initial test results within a specific FTP, CST, or Cold Temperature CO Test Procedure derived in paragraph (a) of this section for each test vehicle, dividing by the number of times that specific FTP, CST, or Cold Temperature CO Test Procedure has been conducted on the vehicle, and rounding to the same number of decimal places contained in the applicable emission standard expressed to one additional significant figure. Rounding is done in accordance with ASTM E 29-90, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications. This procedure has been incorporated by reference (see §86.1).

(c) Final deteriorated test results -- (1) For each test vehicle. The final deteriorated test results for each test vehicle are calculated by multiplying the final test results by the appropriate deterioration factor derived from the certification process for the engine family and model year to which the selected configuration belongs and rounding to the same number of decimal places contained in the applicable emission standard. Rounding is done in accordance with ASTM E 29-90, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications. This procedure has been incorporated by reference (see §86.1). For the purpose of this paragraph, if a deterioration factor as computed during the certification process is less than one, that deterioration factor is one.

(2) Exceptions. (i) There are no deterioration factors for light-duty vehicle emissions obtained during testing in accordance with subpart O of this part. Accordingly, for the CST the term "final deteriorated test results" means the final test results derived in paragraph (b) of this section for each test vehicle, rounded to the same number of decimal places contained in the applicable emission standard. Rounding is done in accordance with ASTM E 29-90, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications. This procedure has been incorporated by reference (see §86.1).

(ii) There are no deterioration factors for light-duty vehicles tested in accordance with §86.146-96. Accordingly, for the fuel dispensing spitback test the term "final deteriorated test results" means the final test results derived in paragraph (b) of this section for each test vehicle, rounded to the same number of significant figures contained in the applicable standard in accordance with ASTM E 29-90, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications. This procedure has been incorporated by reference (see §86.1).

(d) [Reserved]. For guidance see §86.609-84.

[58 FR 58423, Nov. 1, 1993]