The definitions in subpart A of this part apply to this subpart. The following definitions also apply to this subpart.

Certificate of conformity. The document issued by the Administrator under section 213 and section 206(a) of the Act.

Nonconforming engine. An engine which is not covered by a certificate of conformity prior to final or conditional admission (or for which such coverage has not been adequately demonstrated to EPA).

Original engine manufacturer (OEM). The entity which originally manufactured the engine.

Original production (OP) year. The calendar year in which the engine was originally produced by the OEM.

Original production (OP) years old. The age of an engine as determined by subtracting the original production year of the engine from the calendar year of importation.

Production changes. Those changes in the engine configuration, equipment or calibration which are made by an OEM in the course of engine production and required to be reported under §90.123.

United States. United States includes the Customs territory of the United States as defined in 19 U.S.C. 1202, and the Virgin Islands, Guam, American Samoa and the Commonwealth of the Northern Mariana Islands.