14 CFR · Part 25
14 CFR § 25.393
Loads parallel to hinge line.
(a)
Control surfaces and supporting hinge brackets must be designed for inertia loads acting parallel to the hinge line.
(b)
In the absence of more rational data, the inertia loads may be assumed to be equal to KW, where—
(1)
K = 24 for vertical surfaces;
(2)
K = 12 for horizontal surfaces; and
(3)
W = weight of the movable surfaces.
Reflects the eCFR edition current as of September 29, 2026. Retrieved from ecfr.gov on October 16, 2026.
Primary Source