14 CFR § 26.31 - Definitions.

---
identifier: "/us/cfr/t14/s26.31"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "14 CFR § 26.31 - Definitions."
title_number: 14
title_name: "Aeronautics and Space"
section_number: "26.31"
section_name: "Definitions."
chapter_name: "FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "C"
subchapter_name: "AIRCRAFT"
part_number: "26"
part_name: "CONTINUED AIRWORTHINESS AND SAFETY IMPROVEMENTS FOR TRANSPORT CATEGORY AIRPLANES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 106(g), 40113, 44701, 44702 and 44704."
regulatory_source: "Docket No. FAA-2004-18379, 72 FR 63409, Nov. 8, 2007, unless otherwise noted."
cfr_part: "26"
---


# 26.31 Definitions.

For purposes of this subpart—

(a) *Fleet Average Flammability Exposure* has the meaning defined in Appendix N of part 25 of this chapter.

(b) *Normally Emptied* means a fuel tank other than a Main Fuel Tank. Main Fuel Tank is defined in 14 CFR 25.981(b).