§ 86.1360 Supplemental emission test; test cycle and procedures.
The test procedures of this subpart N apply for supplemental emission testing, except as specified otherwise in this section.
(a) Applicability. This section applies to 2007 and later diesel heavy duty engines.
(b) Test cycle. (1) Perform testing as described in § 86.1362 for determining whether an engine meets the applicable standards when measured over the supplemental emission test.
(2) For engines not certified to a NOX standard or FEL less than 1.5 g/bhp-hr, EPA may select, and require the manufacturer to conduct the test using, up to three discrete test points within the control area defined in paragraph (d) of this section. EPA will notify the manufacturer of these supplemental test points in writing in a timely manner before the test. Emission sampling for these discrete test modes must include all regulated pollutants except particulate matter.
(3) For engines certified using the ramped-modal cycle specified in § 86.1362, perform the three discrete test points described in paragraph (b)(2) of this section as follows:
(i) Allow the engine to idle as needed to complete equipment checks following the supplemental emission test described in this section, then operate the engine over the three additional discrete test points.