14 CFR 38.11 - Fuel efficiency metric.

U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

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View all text of Subpart B [§ 38.11 - § 38.23]

§ 38.11 - Fuel efficiency metric.

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:

Where:

The SAR is determined in accordance with § 38.13, and the RGF is determined in accordance with § 38.15. The fuel efficiency metric value is expressed in units of kilograms of fuel consumed per kilometer.