CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS (Parts 50–99) > PART 91—CONTROL OF EMISSIONS FROM MARINE SPARK-IGNITION ENGINES > SUBPART F—Manufacturer Production Line Testing Program (§91.501 to §91.516) > 91.510—Compliance with criteria for production line testing.

91.510—Compliance with criteria for production line testing.

(a) A failed engine is one whose final deteriorated test results pursuant to § 91.509(c), for HC NOX exceeds the applicable Family Emission Limit (FEL).
(b) An engine family may be determined to be in noncompliance, if at any time throughout the model year, the CumSum statistic, Ci, for HC NOX. is greater than the action limit, H, for two consecutive tests.