Title 14 - Aeronautics and Space

Volume: 1Date: 2021-01-01Original Date: 2021-01-01Title: Section Â§ 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]