40 C.F.R. § 87.31
Exhaust emission standards for in-use engines.
Cite as 40 C.F.R. § 87.31 (2026)
Exhaust emission standards apply to in-use aircraft engines as described in 40 CFR 1031.60.
- Cross-references to the CFR
- 40:1031.60.
40 C.F.R. § 87.31
Cite as 40 C.F.R. § 87.31 (2026)