TM 1-1510-218-10 3C-50 Once  go-around  is  selected,  any  roll  mode  can be selected.  The wings level roll command will cancel.   The go-around mode is canceled by selecting another pitch mode or TCS. (12)   TACAN   Mode.      The   TACAN   mode   is selected  by  selecting  the  radio  position  with  the  NAV source  selector  on  the  EFIS  control  panel  and either VOR 1 or VOR 2 selected by the  CRS 1/2 switch to a valid  TACAN  frequency.    TACAN  distance  information will be displayed on the EHSI. NOTE The NAV/TAC receiver must be tuned to a valid TACAN frequency. TACAN  functions  are  identical  to  VOR  using  TA CAN information rather than VOR signals.  The  ARM / CAP  annunciation is the same as in VOR mode. (13)   TACAN   Approach   Mode.      The   TACAN approach   mode   is   the   same   as   a   VOR   approach mode, except that it uses a TACAN in place of a VOR station. g.  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.    Refer  to  Figure  3C-21.    The  autopilot system limits are listed in Table 3C-12. 1.  Pitch Thumbwheel 2.  Bank Limit Switch 3.  Soft Ride Switch 4.  Turn Knob 5.  YD Engage Switch 6.  AP Engage Switch Figure 3C-21.  Autopilot Controller Table 3C-12.  Operating Parameters   MODE CONTROL OR SENSOR PARAMETER VALUE Yaw Damper Yaw Control Engage Limit Unlimited A/P Engage Engage Limit Roll Up to ± 90° Pitch Up to ± 30° Basic Touch Control Roll Control Limit Up to ± 45° Roll A/P Steering TCS Pitch Control Limit Up to ± 20° Pitch Turn Knob Roll Angle Limit ± 30° Roll Rate Limit ± 15°/sec Pitch Wheel Pitch Angle Limit ± 15° Pitch Heading Hold Roll Angle Limit Less    than    6°    and    no    roll    mode selected