TM 1-1510-218-10 3C-52 Table 3C-12.  Operating Parameters  (Continued) MODE CONTROL OR SENSOR PARAMETER VALUE GA Control Switch on Power Lever Fixed Pitch-Up Command, Wings Level 7° Pitch Up Pitch Sync TCS Switch on Control Wheel Pitch Attitude 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) VS Hold Air Data Computer VERT Speed Engage Range O to ± 6000 ft/min ALT Speed Hold ± 30 ft Engage Error Pitch Limit ± 20° Pitch Rate Limit Function of (TAS) IAS Hold Air Data Computer IAS Engage Range 80 to 450 knots IAS Hold Engage Error ± 5 knots Pitch Limit ± 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 ± 20g Pitch Limit ± 20° Pitch Rate Limit Function of (TAS) h.  Autopilot Controller (PC-400) Controls and Functions.  (1)   Pitch Thumbwheel.  Rotation of the pitch thumbwheel  with  the  autopilot  engaged  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  thumbwheel  will cancel  any  other  previously  selected  vertical  mode.   However, for safety, movement of the pitch thumbwheel has no effect with the autopilot coupled to a glideslope signal. (2)   BANK  LIMIT   Switch.      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  Switch.    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 Switch.  When the autopilot is   not   engaged,   the   yaw   damper   may   be   used   by pressing the YD ENGAGE switch. (6)   AP ENGAGE Switch.   The  AP ENGAGE switch 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.