auxiliary power unit
Defined in 1 place of the United States Code.
The term “auxiliary power unit” means an integrated system that—
(A) provides heat, air conditioning, engine warming, or electricity to components on a heavy-duty vehicle; and
(B) is certified by the Administrator under part 89 of title 40, Code of Federal Regulations (or any successor regulation), as meeting applicable emission standards.
Source
- 2005–present42 U.S.C. § 16104The Public Health and Welfare · Reduction of engine idling · in this section