TM 1-1510-225-10 3B-27 (2)   Standby     Attitude     Reference     Indicator Controls   and   Indexes  T3  OSA    .      Refer  to  Figure 3B-14. (a)  Roll Pointer  – Indicates vertical in any roll attitude. (b)  Horizon Line –     Indicates     earth's horizon relative to aircraft pitch attitude. (c)  Caging / Pitch-Trim Knob  – Pulled to cage the indicator and rotated to adjust the miniature aircraft attitude. (d)  Trim Pointer – Indicates trim displacement. 1.  Roll Pointer 2.  Horizon Line 3.  Caging/Pitch-Trim Knob 4.  Trim Pointer 5.  Pitch-Trim Scale 6.  Miniature Aircraft 7.  Drum 8.  Power Warning Flag 9.  Roll Index Figure 3B-14.  Standby Attitude Reference Indicator  T3  OSA (e)  Pitch-Trim Scale – Measures displacement of miniature aircraft. (f)   Miniature Aircraft – Represents aircraft   nose   and   wings.      Indicates   roll   and   pitch attitude   relative   to   the   horizon.      Adjustable   through pitch trim knob for varying pitch attitudes. (g)  Drum   –   Directly   linked   to   the   spin motor to provide direct reading of aircraft movement in roll and pitch.  Marked each 5 in pitch.  Black area of drum  indicates  dive  and  blue  or  gray  area  indicates climb. (h)  Power    Warning    Flag    –     In     view, indicates   power   off,   caged   condition,   open   motor winding, or loss of power.  Retracted, indicates normal operation. (i)    Roll  Index  –  Rotates  with  aircraft  to provide  measurement  of  angular  displacement  by  the roll pointer during maneuvers. 3B-18.  AUTOMATIC FLIGHT CONTROL SYSTEM. a.   Description.      The  Automatic  Flight  Control System    is    a    completely    integrated    autopilot/flight director/ air  data  system  that has a full complement of horizontal  and  vertical  flight  guidance  modes.    These include all radio guidance modes, and air data oriented vertical modes. When engaged and coupled to the flight director commands,  the  system  will  control  the  aircraft  using the    same    commands    displayed    on    the    electronic attitude    director    indicator.        When    engaged    and uncoupled  from  the  flight  director  commands,  manual pitch  and  roll  commands  may  be  inserted  using  the Touch  Control  Steering  (TCS)  or  the  pitch  wheel  and turn knob. When the autopilot is coupled, the flight director instruments act as a means to monitor the performance of the autopilot.  When the autopilot is not engaged,  the  same  modes  of  operation  are  available for flight director only.  The pilot maneuvers the aircraft to  satisfy  the  flight  director  commands,  as  does  the autopilot when it is engaged. NOTE The autopilot will disengage when transferring  between  the  pilot  and  copilot flight directors.  b.  Autopilot Flight Director Transfer Panel.  A panel,   containing   an   alternate   action   autopilot   and flight director transfer switch, placarded   AP FD 1  /  AP FD   2,   is   located   on   the   pedestal   extension.      This switch  is  used  to  select  which  autopilot  flight  director computer controls the aircraft flight servos.  If  AP FD 2 is selected, the annunciators, placarded   AP FLT DIR NO.  2,  located  above  the  copilot’s  airspeed  indicator, and  the  annunciator,  placarded   AP  FLT  DIR  NO.  1, located  above  the  pilot’s  altimeter,  will  illuminate  to alert  both  pilots  that  the  No.  2  autopilot  flight  director computer is controlling the aircraft.  If the  AP FD 1 is selected, only the annunciator labeled  AP FD 1 above the pilot’s altimeter will illuminate.