CS 22.447 Combined loads on tail surfaces
CAA ORS9 Decision No. 1
(a) The unsymmetrical distribution of the balancing load on the horizontal tail which arises in flight conditions A and D of the V-n envelope must be combined with the appropriate manoeuvring load on the vertical surface as specified in CS 22.441 acting in such a direction as to increase the rolling torque.
(b) 75% for Category U and 100% for Category A of the loads according to CS 22.423 for the horizontal tail and CS 22.441 for the vertical tail must be assumed to be acting simultaneously.