FH1100 , 14CFR27.397 pertains to the structural integrity of the flight control system. Should a gorilla enter the cockpit and move the controls then the controls should not break, bend or fail at loads up to those listed. The numbers I sighted are from an FAA human factors report. 14CFR27.141 addresses the control of the aircraft under normal flight conditions and 14CFR27.695 address control after a failure. Both paragraphs are sufficiently vague and list no specific numbers. I can send you a copy of the Human Factors report if you would like.
Jack