14 C.F.R. § 25.531 Hull and main float takeoff condition.
Title 14 - Aeronautics and Space
For the wing and its attachment to the hull or main float— (a) The aerodynamic wing lift is assumed to be zero; and (b) A downward inertia load, corresponding to a load factor computed from the following formula, must be applied:
where— n=inertia load factor; C V β=angle of dead rise at the main step (degrees); and W=design water takeoff weight in pounds. [Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25–23, 35 FR 5673, Apr. 8, 1970]
Title 14: Aeronautics and Space
PART 25—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES
Subpart C—Structure
Water Loads
§ 25.531 Hull and main float takeoff condition.