TM 1-1510-225-10 3B-30 pressing the   ALTSEL  button  on  the  mode  selector.   The  desired  altitude  is  selected  on  the  altitude  pre- select   controller.      Pitch   hold,   VS,   or   IAS   may   be selected  as  a  mode  to  fly  to  the  selected  altitude.   When outside the   altitude  bracket  trip  point,  the   ALT SEL  ARM  annunciator  along  with  the  selected  pitch mode   is   illuminated   on   the   mode   selector.      When reaching the bracket altitude, the system automatically switches to the ALTSEL CAP mode and the previously selected   pitch   mode   is   cancelled.      At   bracket,   a command  is  generated  to  asymptotically  capture  the selected  attitude.    When  the  altitude  is  reached,  the ALT  SEL  CAP  mode  is  automatically  cancelled  and the FD switches to the ALT hold mode.  If the air data computer is not valid, the ALTSEL cannot be selected.   The command cue will bias out of view if the VG is not valid. (m) Standby  Mode.    The  Standby  (SBY) mode  is  selected  by  pressing  the   SBY  button  on  the mode  selector.   This  resets  all  the  other  flight  director modes and biases the command cue from view.  While pressed,  SBY  acts  as  a  lamp  test  causing  all  mode annunciators    to    illuminate    and    the    flight    director warning flag on the EADI to come in view.  When the button    is    released,    the    mode    annunciator    lights extinguish  and the flight director warning flag retracts from view. (n)  Go-Around   Mode.      The   Go-Around (GA)    mode    is    selected    by    pressing    the    remote go-around switch.  When selected, all other modes are reset  and  the  remote   GA  annunciator  is  illuminated.   The  command  cue  receives  a  wings  level  command (zero command when roll is zero).  The command cue also  receives  the  go-around  command  which  is  a  7 pitch up attitude command.  Selecting GA disconnects the autopilot. The yaw damper remains on. Once  go-around  is  selected,  any   roll mode can be    selected    and    will    cancel    the    wings    level    roll command.      The   go-around   mode   is   cancelled   by selecting another pitch mode or TCS. e.   Autopilot Controller. The Autopilot Controller    provides    the    means    of    engaging    the autopilot    and    yaw    damper    as    well    as    manually controlling   the   autopilot   through   the   turn   knob   and pitch wheel, Figure 3B-15.  The autopilot system limits are provided in Table 3B -7. (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  are  not selected,  the  pitch  wheel  works  as  described  above.   The  pitch  wheel  is  always  disabled  during  a  coupled glide slope. (2)   Bank  Limit.    Selection  of  the  Bank  Limit mode   on   the   autopilot   controller   provides   a   lower maximum   bank   angle   while   in   the   Heading   Select (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)   SOFT   RIDE   Push   Button.      Soft    ride reduces autopilot gains while still maintaining stability in  rough  air.    This  mode  may  be  used  with  any  F/D 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. (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 engage switch is  used to engage the autopilot.  Engaging the autopilot automatically engages the yaw damper.  The autopilot   may   be   engaged   with   the   aircraft   in   any reasonable  attitude.    Refer  to  Table  3B-7  for  autopilot system   limits.      Autopilot   is   normally   disengaged   by momentarily   pressing   the   control   wheel   AP   DISC switch.    Autopilot  may  also  be  disengaged  by  any  of the following methods.