MIL-F-18372(Aer)
3.2.1.2.3 Stick and Wheel Requirements
3.2.1.2.3.1 Control Stick - If a control stick is used, and is removable, it shall be positively
latched in place when isnstalled. It shall be possible to install the stick only in the correct
manner, and suitable means shall be provided to prevent rotation of the stick.
3.2.1.2.3.2 Control Wheel - Control wheels shall be constructed of a material of adequate strength
and durability, and shall be designed to have a minimum of sight interference with the instrument
panel.
3.2.1.2.4 Directional Control -Directional control shall be by means of foot pedals. Pushing
the right pedal shall cause the aircraft to turn to the right. Pushing the left pedal shall cause
the aircraft to turn to the left. The range of movement of the foot pedals shall be a mzximum of 4"
forward and 4" aft of the neutral position. The foot pedals shall be interconnected to insure positive
movement of each pedal in both directions.
3.2.1.2.4.1 Adjustement - The foot pedals shall be readily adjustable in flight to at least 3"
forward and 3" aft of neutral, in increments not exceeding 1". Both pedals shall be adjusted
simultaneously by means of a single control, and the control shall be located in accordance with
MIL-STD-203.
3.2.2 Wheel Brakes Control - Rights and left brakes shall be separately actuated by toe
force on brake pedals on the rudder controls except for bicycle gear or quadricycle gear, where other
suitable brake controls may be used subject to approval of the Bureau of Aeronautics. Pedal locations
in the cockpit shall be in accordance with MIL-STD-203. The brake pedal linkages shall be so designed
that a comfortable angle of approximately 90° between the pilot's foot and his lower leg is maintained
throughout the full range of movement of the rudder pedals and seat. The desired shape and travel of
the brake pedals are shown in Figures 1 and 2 respectively. Linkages between the brake pedals and
the brake control device shall be as free as possible of lost motion or yielding of parts. Means shall
be provided to positively return the brake pedals to the "off" position when toe force is removed
from the pedals.
3.2.2.1 Manual Breaking Systems - The pedal linkages for manual braking systems shall be such
that :
a. A foot force of between 15 and 20 pounds at the tip of the pedal will be required
to cause initial movement of the brake pedal.
b. A foot force of between 75 and 125 pounds at the tip of the pedal will produce the
braking deceleration specified in Specification MIL-W-5O13 at the normal landing
gross weight.
c. The travel of the pedal for full brake application shall be as indicated in
Figure 2. It shall not exceed 300 while meeting the requirements of sub-
paragraph b above.
d. In all positions of the rudder pedal or the rudder linkage, and the seat it
shall be possible for the pilot to apply sufficient static brake torque to
hold the wheels locked against a coefficient of friction of 0.55 between the
tires and the ground at maximum alternate weight. It shall be possible to
meet this requirement with the brakes at a temperature of 21°C (70°F).
3.2.2.2 Power Braking System - The pedal linkages for power braking systems shall be such that:
a. A foot force of between 15 and 20 pounds at the tip of the pedal will be required
to cause initial metering through the power brake valve.
b. A foot force of between 65 and 85 pounds at the tip of the pedal will produce the
braking deceleration specified in Specification MIL-W-5013 at the normal landing
groom weight.
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