TM 1-1510-218-10 3C-93 When  the  MAP  becomes  the  active  waypoint, sequencing is automatically inhibited as the sequence  mode  is  switched  to  MAN.    On  the  TO side of the MAP, pilot selection of AUTO sequencing is inhibited and AUTO can be selected on the FROM side  of  the  MAP.    A  Direct-To  any  waypoint  other than the MAP will switch sequencing back to AUTO. The FMS will automatically revert from FLYOVER    to    AUTO    sequencing    for    procedure execution when the first SID, STAR, or APPROACH waypoint becomes the active waypoint or the aircraft enters  the  TERMINAL  area.    If  a  SID,  STAR,  or APPROACH   point   is   specifically   identified   as   a flyover   waypoint   in   the   database   procedure,   the FMS will sequence the waypoint in flyover mode but remain in AUTO sequence mode on the Flight Plan page.        The    pilot    may    override    the    automatic sequence mode selections, except when the MAP is the active waypoint. (5)   Lateral  To-To  Course  Transitions  with Automatic    Sequencing,    Manual    Sequencing,    and Course Selection. (a)   Manual   Sequence   Mode.      When manual sequencing is selected,  the  flight  plan  does not advance to the next leg automatically.  The flight plan  only  sequences  when  the  crew  selects  AUTO; selects   FLYOVER   sequence   mode   on   the   Flight Plan    page;    or    performs    a    Direct-To   any   other waypoint.    The  course  from  the  active  waypoint is based    on    the    computed    course    at    the    active waypoint   or   a   crew-entered  course  on  the  Flight Plan page.  Prior to passing over the active waypoint, a waypoint alert indication will occur at the time to go specified  on  the  Navigation  Configuration  page.  At 10 seconds   prior   to   the   waypoint,   the   waypoint number   on   the   Flight   Plan   page   and   the   ¯    to  ¯ indicator   on   the   Lateral   Steer   page   will   flash   for 10 seconds.    As  the  waypoint  is  passed,  the   WPT PASSED    annunciation    will    be    displayed    on    the annunciation   line   and   a   FROM   indication   will   be displayed   on   the   title   line   of   the   Flight   Plan   and Lateral   Steer   pages.      The   FMS   will   continue   to provide  guidance  to  the  outbound  FROM  course from the active waypoint. To fly on a desired outbound course, perform the following steps. 1.   Select   MAN   sequence   mode   on   the Flight Plan page. 2.   Select   (via   a   Direct-To)   or   enter   the desired active waypoint data. 3.   Enter the desired course. By   selecting   MAN,   the   new   active   waypoint   is prevented  from  sequencing  when  it  is  inserted  into  the flight plan or the new desired course is entered.  A new inbound course may also be manually entered when the sequencing  mode  is  AUTO  or  FLYOVER,  but  entry  is limited to   90° of the computed inbound course.  If the aircraft    is    on    the    TO    side    of    the    waypoint    after completing   these   steps,   the   aircraft   must   fly   to   that waypoint before it can fly the outbound (FROM) course as  selected.    If  the  aircraft  is  on  the  FROM  side  of  the waypoint,  the  FMS  will  immediately  initiate  guidance  to the  desired  outbound  course  and  the  TO  indication  will change to a FROM indication.  Refer to Figure 3C-39 for an   example   of   execution   of   manual   sequencing   and course edits. (b)   TACAN   Emulation.      Since   the   FMS provides  the  capability  to  fly  a  selected  course  TO  or FROM the active waypoint (TO-FROM navigation), it can be used to perform emulation of TACAN navigation.  The crew  can  enter,  display,  and  fly  the  courses  printed  on the  Instrument  Flight  Rules  (IFR).    En  Route  Low  and High  Altitude  aeronautical  charts  for  published  airways or   courses   associated   with   VOR’s,   VORTAC’s,   VOR- DME’s,  or  TACAN’s.    Refer  to  Figure  3C-40 and Table 3C-32   for   a   description   of   configuring   the   FMS   for TACAN  emulation.    The  steps  to  configure  for  TACAN emulation  are  the  same  as  for  manual  sequencing  and course edits, except that the new active waypoint must be  the  ICAO  identifier  for  a  VOR,  VORTAC,  VOR-DME, or  TACAN.    The  FMS  will  provide  guidance  to  the  flight instruments, as it appears published on the aeronautical charts.    If  a  DME  arc  is  to  be  flown,  the  CDU  Lateral Steering   page   continues   to   show   the   bearing   and distance  to  the  station  (waypoint)  as  the  arc  is  flown.   Distance   on   the   Lateral   Steer   page   is   always   direct distance to the waypoint, not a path distance.