§ 89.207-96 - Credit calculation.

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For each participating engine family, emission credits (positive or negative) are to be calculated according to one of the following equations and rounded, in accordance with ASTM E29-90, to the nearest one-tenth of a megagram per hour (Mg/hr). ASTM E29-90 has been incorporated by reference. See § 89.6. Consistent units are to be used throughout the equation.

(a) For determining credit availability from all engine families generating credits:

(b) For determining credit usage for all engine families requiring credits to offset emissions in excess of the standard:

                    
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