Alternate transition option for Phase 2 engine standards Sample Clauses

Alternate transition option for Phase 2 engine standards. (i) Manufac- turers may optionally elect to comply with the model year 2021 primary (Phase 2) vocational vehicle and trac- tor engine standards in paragraph (d)(3) of this section beginning in model year 2020 (e.g. comply with the more strin- gent standards one year early). The model year 2021 standard would apply to these manufacturers for model years 2020 through 2023. Manufacturers that voluntarily certify their engines to model year 2021 standards early would then be eligible for less stringent en- gine tractor standards in model years 2024 through 2026, as follows: (A) 5.2849 gallons per 100 hp-hr for MHD vocational vehicle engines. (B) 4.5874 gallons per 100 hp-hr for MHD tractor engines. (C) 4.9705 gallons per 100 hp-hr for HHD vocational vehicle engines. (D) 4.3418 gallons per 100 hp-hr for HHD tractor engines. (ii) The primary standard in para- graph (d)(3) applies for all manufactur- ers in model year 2027 and later years. (iii) Manufacturers may apply these provisions separately for medium heavy-duty engines and heavy heavy- duty engines. This election applies to all engines in each segment. For exam- ple, if a manufacturer elects this alter- nate option for its medium heavy-duty engines, all of the manufacturer’s me- dium heavy-duty vocational and trac- tor engines must comply. Engine fuel consumption credits generated under § 535.7(d) for manufacturers complying early with the model year 2021 stand- ards follow the temporary extended credit life allowance in § 535.7(d)(9).