14 C.F.R. § 25.343 Design fuel and oil loads.
Title 14 - Aeronautics and Space
(a) The disposable load combinations must include each fuel and oil load in the range from zero fuel and oil to the selected maximum fuel and oil load. A structural reserve fuel condition, not exceeding 45 minutes of fuel under the operating conditions in §25.1001(e) and (f), as applicable, may be selected. (b) If a structural reserve fuel condition is selected, it must be used as the minimum fuel weight condition for showing compliance with the flight load requirements as prescribed in this subpart. In addition— (1) The structure must be designed for a condition of zero fuel and oil in the wing at limit loads corresponding to— (i) A maneuvering load factor of +2.25; and (ii) The gust conditions of §25.341(a) but assuming 85% of the design velocities prescribed in §25.341(a)(4). (2) Fatigue evaluation of the structure must account for any increase in operating stresses resulting from the design condition of paragraph (b)(1) of this section; and (3) The flutter, deformation, and vibration requirements must also be met with zero fuel. [Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25–18, 33 FR 12226, Aug. 30, 1968; Amdt. 25–72, 55 FR 37607, Sept. 12, 1990; Amdt. 25–86, 61 FR 5221, Feb. 9, 1996]
Title 14: Aeronautics and Space
PART 25—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES
Subpart C—Structure
Flight Maneuver and Gust Conditions
§ 25.343 Design fuel and oil loads.
