§ 1042.310 Engine selection for Category 1 and Category 2 engines.

(a) For Category 1 and Category 2 engine families, the minimum sample size is one engine. You may ask us to approve treating commercial and recreational engines as being from the same engine family for purposes of production-line testing if you certify them using the same emission-data engine.

(b) Select engines for testing as follows:

(1) For Category 1 engines, randomly select one engine within the first 60 days of the start of production for each engine family.