StacksVerified U.S. regulatory reference

14 CFR §38.11

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
For each airplane subject to this part, or to determine whether a modification makes an airplane subject to this part under the change criteria of § 38.19, a fuel efficiency metric value must be calculated, using the following equation, rounded to three decimal places: