H = K (1/2) [RHO]o V2 c S
Where-
K = hinge moment factor for ground gusts derived in paragraph (c) of this section;
[RHO]o = density of air at sea level;
V = 65 knots relative to the aircraft;
S = area of the control surface aft of the hinge line;
c = mean aerodynamic chord of the control surface aft of the hinge line.
Surface | K | Position of controls |
(1) Aileron | 0.75 | Control column locked or lashed in mid-position. |
(2) Aileron | * ±0.50 | Ailerons at full throw. |
(3) Elevator | * ±0.75 | Elevator full down. |
(4) Elevator | * ±0.75 | Elevator full up. |
(5) Rudder | 0.75 | Rudder in neutral. |
(6) Rudder | 0.75 | Rudder at full throw. |
* A positive value of K indicates a moment tending to depress the surface, while a negative value of K indicates a moment tending to raise the surface.
14 C.F.R. §25.415