§87.21. Exhaust emission standards for Tier 4 and earlier engines.
40 C.F.R. § 87.21
Exhaust emission standards apply to new aircraft engines as described in 40 CFR 1031.40 through 1031.90.
Notes, amendments, and revision history
Authority
Authority: 42 U.S.C. 7401 et seq.
Source
Source: 87 FR 72350, Nov. 23, 2022, unless otherwise noted.