Except

Except means to routinely allow engines to be produced and sold that do not meet (or do not fully meet) otherwise applicable standards. (Note that this definition applies only with respect to spare engines and that the term except has its plain meaning in other contexts.) Excepted engines must conform to regulatory conditions specified for an exception in this part and other applicable regulations. Excepted engines are deemed to be subject to the standards of this part even though they are not required to comply with the otherwise applicable requirements. Engines excepted with respect to certain standards must comply with other standards from which they are not excepted.

Source

40 CFR § 87.1

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Scoping language

The definitions in this section apply to this part. The definitions apply to all subparts. Any terms not defined in this section have the meaning given in the Clean Air Act. The definitions follow:

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