Division 3.1.3
United Kingdom
The pass or fail decision of the lot shall be made according to the following requirements:
- (a)
if the test statistic is less than or equal to the pass decision number for the sample size given in Table 1, a pass decision is reached for the lot;
- (b)
if the test statistic is greater than or equal to the fail decision number for the sample size given in Table 1, a fail decision is reached for the lot;
- (c)
otherwise, an additional engine is tested according to this Annex and the calculation procedure is applied to the sample increased by one more unit.
In Table 1 the pass and fail decision numbers are calculated by means of the International Standard ISO 8422/1991.
Table 1
Pass and fail decision numbers of the sampling plan
Minimum sample size: 3
| Cumulative number of engines tested(sample size) | Pass decision number | Fail decision number |
|---|---|---|
| 3 | — | 3 |
| 4 | 0 | 4 |
| 5 | 0 | 4 |
| 6 | 1 | 4 |
| 7 | 1 | 4 |
| 8 | 2 | 4 |
| 9 | 2 | 4 |
| 10 | 3 | 4 |
The approval authority shall approve the selected engines and vehicle configurations before the launch of the testing procedures. The selection shall be performed by presenting to the approval authority the criteria used for the selection of the particular vehicles.