Code of Federal Regulations · Section
§ 87.21 — Exhaust Emission Standards For Tier 4 And Earlier Engines
40 C.F.R. § 87.21
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Exhaust emission standards apply to new aircraft engines as described in 40 CFR 1031.40 through 1031.90.
Authorizing Statute
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Congressional findings and declaration of purpose42 U.S.C. § 7401