Q328. For Tier 4 configurations, if there are no missing data, do you still have to report total operating hours in the reporting year and zeros for hours in which substitute data was use?
A328. Yes, you must report the number of source operating hours and you should enter zero for each missing data element in which substitute data was not used.
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Source: This question and answer was derived from a Legacy FAQ
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Relevant Subparts: Subpart C
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