TM 1-1510-225-10 3C-28 feet or deviates more than 1000 feet from the selected altitude. 1. Selected Altitude Display 2. Altitude Selector Knob Figure 3C-13.  Altitude Select Controller (2)   The   altitude   is   selected   by   turning   the selector    knob    until    the    altitude    display    reads    the desired   value.      No   further   action   is   taken   on   the controller.    To  initiate  altitude  pre-select, the  ALTSEL  button is selected on the flight director controller.  The pilot  must  initiate  a  maneuver  to  fly  toward  the  pre- selected  altitude.    Any  of  the  following  pitch  modes may be engaged: Pitch Hold, Airspeed Hold or Vertical Speed   Hold.      Upon   initiation   of   altitude   pre-select capture,     the     previously     selected     pitch     mode     is automatically reset. 3C-20.  AUTOPILOT CONTROLLER. a.     Description.        The    autopilot    provides    the means  of  engaging  the  autopilot  and  yaw  damper,  as well  as  manually  controlling  the  autopilot  through  the turn knob and pitch wheel.  The autopilot system limits are   provided   in   the   Autopilot   System   Limits   Table.   Refer to Table 3C-1. (1)   Pitch   Wheel.      Movement   of   the   pitch wheel  will  cancel  only  ALT HOLD and ALTSEL CAP.   With   vertical   modes   of   VS   or   IAS   selected   on   the mode selector, rotation of the pitch wheel will change the  respective  displayed  vertical  mode  reference.    VS or  IAS  mode  may  be  canceled  by  pressing  the  mode button   on   the   mode   selector.      If   VS   or   IAS   is   not selected,  the  pitch  wheel  works  as  described  above.   The  pitch  wheel  is  always  disabled  during  a  coupled glideslope.  Refer to Figure 3C-14. (2)   Bank  Limit.    Selection  of  the  bank  limit mode   on   the   autopilot   controller   provides   a   lower maximum  bank  angle  while  in  the  HDG  mode.    LOW  will illuminate on the   BANK LIMIT switch.  The lower bank limit is inhibited and  LOW is extinguished during NAV mode captures.  If HDG is again engaged, BANK LIMIT will again be illuminated.  Pressing  BANK LIMIT when  illuminated  will  return  autopilot  to  normal  bank limits. (3)   SOFTRIDE Push Button. Softride reduces autopilot gains while still maintaining stability in  rough  air.    This  mode  may  be  used  with  any  FD mode selected. (4)   TURN  Knob.    Rotating  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.   Rotating  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. Table 3C-1.  Autopilot System Limits MODE CONTROL OR SENSOR PARAMETER VALUE Yaw Damper Yaw Control Engage Limit Unlimited AP Engage Engage Limit Roll Up to ± 90° Pitch Up to ± 30° Basic AP Touch Control Steering TCS Roll Control Limit Up to ± 45° Roll Up to ± 25° Pitch Turn Knob Roll Angle Limit Roll Rate Limit ± 30° ± 15°/sec Pitch Wheel Pitch Angle Limit ± 15° Pitch Heading Hold Roll Angle Limit Less  than  6°  and  no  roll mode selected.