TM 1-1510-218-10 3A-35 illuminate.        Glideslope    capture    is    dependent    on localizer    capture    and    must    occur    after    localizer capture.      The   localizer   is   always   captured   from   a selected heading, but the glideslope may be captured with   autopilot   operating   in   any   vertical   mode   (pitch hold,  altitude  hold,  or  indicated  airspeed  hold),  and from above (not recommended) or below the glideslope.  At the point of glideslope intercept, the  GS CAP   annunciator   lamp   will   illuminate   and   all   pre- selected vertical modes will be cleared. NOTE During coupled approaches, if the VOR/localizer  signal  is  lost,  or  frequency changes, the flight director command bars will   remain   in   view   displaying   unreliable indications.  (f)   Go-Around  Mode.    Pressing  the   GO AROUND button on the outboard side of the left power lever  selects  the  go-around  mode.    Go-around mode may  be  selected  from  any  lateral  mode,  HDG,  NAV, APPR,   or   BACK   LOC.      When   go-around  mode  is selected,     the     autopilot     will     disengage,     the     GA annunciator    lamp    will    illuminate,    and    a    command presentation   for   wings   level   and   7  nose  up  pitch attitude   will   appear   on  the  pilot's  horizon  reference indicator. NOTE The  heading  marker  may  be  preset  to  the go   around   heading   after   the   localizer   is captured.      After   go-around  airspeed  and power  settings  are  established,  select  the HDG  mode  to  clear  the  go-around mode.   Pitch  attitude  will  remain  at  that  used  for go-around  until  changed  with  the  PITCH SYNC  &  CWS  button  or  the  selection  of  a vertical mode. (g)   Pitch   Hold   Mode.      The   pitch   hold mode is selected by selecting one of the vertical mode selector  switches  or  actuating  the  pitch  synchronize and  control  wheel  steering  switch,   PITCH  SYNC  & CWS, located on each control wheel. (h)   Control Wheel Steering Mode. Pressing  one  of  the   PITCH  SYNC  &  CWS  switches located    on    each    control    wheel    disconnects    the autopilot  servos  from  the  control  surfaces,  allows  the pilot  to  fly  the  aircraft  to  a  new  pitch  attitude,  and synchronizes  the  vertical  command  bar  on  the  pilot's horizon  reference  indicator  to  aircraft  attitude.    The ALT or IAS mode will disengage, if selected, when the PITCH  SYNC  &  CWS  button  is  pressed.    When  the autopilot is coupled to the HDG, NAV, APPR, or BACK LOC   modes,   releasing   the   PITCH   SYNC   &    CWS switch   will   cause   the   autopilot   to   couple   to   the previously selected mode. (i)   Altitude   Hold   Mode.      Pressing   the ALT  selector  switch  on  the  autopilot  mode  selector panel  when  desired  altitude  has  been  reached,  with autopilot  engaged,  will  cause  the  autopilot  to  fly  the aircraft to maintain the barometric altitude at which the aircraft   was   flying   when   ALT   switch   was   pressed,   illuminate the ALT annunciator lamp on the autopilot/flight  director  annunciator  panel,  and  display the  altitude  hold  commands  on  the  vertical  command bar  of  the  pilot's  horizon  reference  indicator  with  the flight director engaged. (j)   Indicated Airspeed Hold Mode. Pressing the IAS selector switch on the autopilot mode selector    panel    when    desired    airspeed    has    been reached,    with    autopilot    engaged,    will    cause    the autopilot  to  fly  the  aircraft  to  maintain  the  indicated airspeed  at  which  the  aircraft  was  flying  when   IAS  switch   was   pressed,   illuminate   the   IAS  annunciator lamp on autopilot/flight director annunciator panel, and   display    the    IAS    hold    commands    on    the    vertical command bar of the pilot's horizon reference indicator. i.    Takeoff and Climbout. (1)   Before Takeoff. 1.   Heading     marker,     pilot's     horizontal situation   indicator   –   Set   to   runway heading. 2.   HDG  selector  switch,  autopilot  mode selector panel – Press, do not engage autopilot. (2)   Takeoff.    Pressing  the   PITCH  SYNC  & CWS  switch  on  control  wheel  will  provide  pitch  sync and the crosspointers on the pilot's horizon reference indicator  will  command  flight  to  the  pitch  attitude  that existed  at  the  time  the   PITCH  SYNC  &  CWS switch was pressed. (3)   Climbout. 1.   Climb profile – Establish. 2.   ENG / DIS switch –  ENG, when above 200 feet above ground level. 3.   IAS selector switch – Press if desired. 4.   HDG knob  – Move heading marker as required to make heading changes. (4)   Cruise Altitude.