(a) [Reserved]

(b) Starting January 1, 2011, report CO2 values along with your emission levels of regulated NOX to the Administrator for engines of a type or model of which the date of manufacture of the first individual production model was on or after January 1, 2011. By January 1, 2011, report CO2 values along with your emission levels of regulated NOX to the Administrator for engines currently in production and of a type or model for which the date of manufacture of the individual engine was before January 1, 2011. Round CO2 to the nearest 1 g/kilonewton rO.

(c) Report CO2 by calculation from fuel mass flow rate measurements in Appendices 3 and 5 to ICAO Annex 16, volume II or alternatively, according to the measurement criteria of CO2 in Appendices 3 and 5 to ICAO Annex 16, volume II.

[74 FR 56374, Oct. 30, 2009, as amended at 77 FR 36386, June 18, 2012]