(2) Subject to subsection (3), the standards referred to in subsection (1) apply for the useful life of the engine and include the test procedures, fuels and calculation methods set out in CFR 89 or CFR 1039, as the case may be, for the model year in question. For greater certainty, the certification standards described in section 120, subpart B, of CFR 89 or section 240, subpart C, of CFR 1039, as the case may be, apply to the model year in question.