TM 1-1510-218-10 3B-31 Table 3B-3.  Autopilot System Limits  (Continued) MODE CONTROL OF SENSOR PARAMETER VALUE Pitch Sync TCS    Switch    on    Control Wheel Pitch Altitude Command ± 20° max ALT Hold Air Data Computer ALT Hold Engage Range 0 to 50,000 ft ALT Hold Engage Error ± 20 ft Pitch Limit ± 20° Pitch Rate Limit Function of (TAS) VA Hold Air Data Computer VERT Speed Engage Range 0 to ± 6000 ft/min ALT  Speed  Hold  Engage Error ± 30 ft Pitch Rate ± 20° Pitch Rate Limit Function of (TAS) ALT Preselect Air Data Computer Preselect Capture Range 0 to 50,000 ft Maximum  Vertical  Speed for Capture ± 4000 ft/min Maximum Gravitational Force During Capture Maneuver ± .2g Pitch Limit ± 20° Pitch Rate Limit Function of (TAS) g.    Controls and Functions. Refer to Figure 3B-17. (1)   Pitch Wheel.    Rotation  of  the  pitch  wheel results in a change of pitch attitude proportional to the rotation of the pitch wheel and in the direction of wheel movement.  Movement of the pitch wheel cancels any other   previously   selected   vertical   mode.      However, movement  of  the  pitch  wheel  has  no  effect  with  the autopilot coupled to the glideslope. (2)   BANK  LIMIT  Push  Button.    Selection  of the bank limit mode on the autopilot controller provides a  lower  maximum  bank  angle  while  in  the  Heading Select mode.  LOW will illuminate on the BANK LIMIT switch.    The  lower  bank  limit  is  inhibited and  LOW is extinguished  during  NAV  mode  captures.    If  heading select  is  again  engaged,   BANK  LIMIT   will  again  be illuminated.  Pressing   BANK LIMIT  when illuminated will return autopilot to normal bank limits. (3)   SOFT   RIDE   Push   Button.        Soft    ride reduces autopilot gains while still maintaining stability in  rough  air.    This  mode  may  be  used  with  any  flight director mode selected. (4)   TURN Knob.  Rotation of the TURN knob out of detent results in a roll command.  The roll angle is  proportional  to  and  in  the  direction  of  the   TURN knob  rotation.    The   TURN  knob  must  be  in  detent, center  position,  before  the  autopilot  can  be  engaged.   Rotation    of    the    TURN    knob    cancels    any    other previously selected lateral mode. (5)   YD  ENGAGE  Push  Button.    When  the autopilot   is   not   engaged,  the  yaw  damper  may  be utilized by pressing the YD ENGAGE push button. (6)   AP   ENGAGE   Push   Button.      The   AP ENGAGE push button is used to engage the autopilot.   Engaging the autopilot automatically engages the yaw damper.      The   autopilot   may   be   engaged   with   the airplane in any reasonable attitude.