40 CFR 1031.50 – Subsonic turbojet and turbofan engines at or below 26.7 kN thrust
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The following standards apply to new turbofan or turbojet aircraft engines with rated output at or below 26.7 kN thrust that are installed in subsonic aircraft:
(a) Smoke. Engines of a type or model for which the date of manufacture of the individual engine is on or after August 9, 1985 may not have a characteristic level for smoke number exceeding the lesser of 50 or the following value:
(b) [Reserved]