CS 22.415  Ground gust conditions

CAA ORS9 Decision No. 1

The control system from the control surfaces to the stops, or when installed, the arresting devices must be designed for limit loads corresponding to hinge moments calculated from the expression: 

where : 

M_R = limit hinge moment 

   = mean chord of control surface aft of hinge line 

S_R   = area of control surface aft of hinge line 

q    = dynamic pressure corresponding to an air speed of 100 km/h 

k    = limit hinge moment factor due to ground gust, taken from the following table: 

Control Surface	k	Remarks
Aileron	±0.75	Control column secured in mid-position
	±0.50	Ailerons at full travel + moment at the one, – moment at the other aileron
Elevator	±0.75	Elevator fully up (–) or fully down (+) or in the position in which it can be locked
Rudder	±0.75	Rudder at full travel right or left, or locked in neutral