---
kind: "section"
citation: "14 C.F.R. § 38.17"
title: "14"
number: "38.17"
heading: "Fuel efficiency limits."
url: "https://uscodex.org/cfr/14/38.17"
---

# §38.17. Fuel efficiency limits.

- (a) The fuel efficiency limits in this section are expressed as maximum permitted fuel efficiency metric values, as calculated under [§ 38.11](/cfr/14/38.11.md).
- (b) The fuel efficiency metric value of an airplane subject to this part may not exceed the following, rounded to three decimal places:

## Notes

### Authority

Authority: 42 U.S.C. 4321 et seq., 7572; 49 U.S.C. 106(g), 40113, 44701-44702, 44704; 49 CFR 1.83(c)

### Source

Source: Docket No. FAA-2022-0241, Amdt. No. 21-107, 89 FR 12654, Feb. 16, 2024, unless otherwise noted.