CFR /  Title 14  /  Part 26  /  Sec. 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).