FAA Federal Aviation Regulations (FARS, 14 CFR)

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Maximum forces or
torques for design
weight, weight    Minimum forces or
Control                equal to or less      torques \2\
than 5,000 pounds
\1\
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Aileron:
Stick.......................  67 lbs............  40 lbs.
Wheel \3\...................  50 D in.-lbs \4\..  40 D in.-lbs.\4\
Elevator:
Stick.......................  167 lbs...........  100 lbs.
Wheel (symmetrical).........  200 lbs...........  100 lbs.
Wheel (unsymmetrical) \5\...  ..................  100 lbs.
Rudder........................  200 lbs...........  150 lbs.
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\1\ For design weight (W) more than 5,000 pounds, the specified maximum
values must be increased linearly with weight to 1.18 times the
specified values at a design weight of 12,500 pounds and for commuter
category airplanes, the specified values must be increased linearly
with weight to 1.35 times the specified values at a design weight of
19,000 pounds.
\2\ If the design of any individual set of control systems or surfaces
makes these specified minimum forces or torques inapplicable, values
corresponding to the present hinge moments obtained under §
23.415, but not less than 0.6 of the specified minimum forces or
torques, may be used.
\3\ The critical parts of the aileron control system must also be
designed for a single tangential force with a limit value of 1.25
times the couple force determined from the above criteria.
\4\ D=wheel diameter (inches).
\5\ The unsymmetrical force must be applied at one of the normal
handgrip points on the control wheel.

[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964, as amended by Amdt. 23-7, 34 FR 13089, Aug. 13, 1969; Amdt. 23-17, 41 FR 55464, Dec. 20, 1976; Amdt. 23-34, 52 FR 1829, Jan. 15, 1987; Amdt. 23-45, 58 FR 42160, Aug. 6, 1993]