Code of Federal Regulations

Title 14 - Aeronautics and Space
Volume: 1Date: 2021-01-01Original Date: 2021-01-01Title: Section § 25.531 - Hull and main float takeoff condition.Context: Title 14 - Aeronautics and Space. CHAPTER I - FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION. SUBCHAPTER C - AIRCRAFT. PART 25 - AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES. Subpart C - Structure. - Water Loads.
§ 25.531 Hull and main float takeoff condition. 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: [Please see PDF for Formula: EC28SE91.038] where— n = inertia load factor; C TO = empirical seaplane operations factor equal to 0.004; V S 1 = seaplane stalling speed (knots) at the design takeoff weight with the flaps extended in the appropriate takeoff position; 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]