---
kind: "unit"
title: "14"
title_heading: "Aeronautics and Space"
key: "chI/subchC/part38"
level: "part"
label: "Part 38"
heading: "Airplane Fuel Efficiency Certification"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/14/chI-subchC-part38"
sections_count: 13
---

# Part 38 — Airplane Fuel Efficiency Certification

Title 14 C.F.R. — Aeronautics and Space › Chapter I — Federal Aviation Administration, Department of Transportation › Subchapter C — Aircraft

## Contents

- [Subpart A — General](/cfr/14/chI-subchC-part38-subpartA.md)
- [Subpart B — Determining Fuel Efficiency for Subsonic Airplanes](/cfr/14/chI-subchC-part38-subpartB.md)