Derivative engines for emissions certification purposes.

CFR · 2024-01-01 · US · Title 14

(a) (1) The FAA has determined that a safety issue exists that requires an engine modification. (2) Emissions from the derivative engines are determined to be similar. In general, this means the emissions must meet the criteria specified in paragraph (b) of this section. The FAA may amend the criteria of paragraph (b) in unusual circumstances, for individual cases, consistent with good engineering judgment. (3) All of the regulated emissions from the derivative engine are lower than the original engine. (b) (i) ±3.0 g/kN for NO (ii) ±1.0 g/kN for HC. (iii) ±5.0 g/kN for CO. (iv) ±2.0 SN for smoke. (2) If the characteristic level of the original certificated engine model (or any other sub-models within the emission type certificate family tested for certification) before modification is at or above 95% of the applicable standard for any pollutant, an applicant must measure the proposed derivative engine model's emissions for all pollutants to demonstrate that the derivative engine's resulting characteristic levels will not exceed the applicable emission standards. If the characteristic levels of the originally certificated engine model (and all other sub-models within the emission type certificate family tested for certification) are below 95% of the applicable standard for each pollutant, the applicant may use engineering analysis consistent with good engineering judgment to demonstrate that the derivative engine will not exceed the applicable emission standards. The engineer

official document · source cfr-2024 · id 14:§ 34.48