(a) If used, the engine intake air flow measurement method used must have a range large
enough to accurately measure the air flow over the engine operating range during the
test. Overall measurement accuracy must be two percent of full-scale value of the measurement
device for all modes except the idle mode. For the idle mode, the measurement accuracy must be±five percent or less of the
full-scale value. The Administrator must be advised of the method used prior to testing.
(b) When an engine system incorporates devices that affect the air flow measurement (such
as air bleeds, air injection, pulsed air, and so forth) resulting in understated exhaust
emission results, make corrections to the exhaust emission results to account for
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