TM 1-1510-225-10 3B-14 flashes    for    5    seconds    when    a    new    annunciation occurs.    Refer  to  Table  3B-1  for  FD  output  and  their annunciations. The MFD displays red-colored dashes in the FD fields and retains the FD command bars if the FD sets more than one annunciation for that field or if the Data Concentrator  Unit  fails.    The  annunciator  fields  will  be blanked when   the  command  bars  are  removed  from the   display,   when   the   unit   is   turned   off,   placed   in standby  mode,  commanded  out  of  view,  or  FD  validity flagged. d.  Vertical  Guidance.    The  FDS -255 supports glideslope and VNAV Guidance.  The glideslope scale and pointer are  displayed when the navigation source is  LOC,  the  localizer  is  valid,  and  the  glideslope  is valid.    The  VNAV  scale  and  pointer  will  be  displayed when the navigation course source is FMS, the FMS is valid,  the  VNAV  is  valid,  and  the  VNAV  is  available from the FMS. A  scale  and  pointer  located  on  the  right  side  of the    indicator    displays    deviation    from    the    selected vertical path.  The scale consists of a pair of white dots above   and   below   a   white   center   index.      Maximum travel of the pointer is 2.5 dots. The    glideslope    (GS)    deviation    pointer    is    a magenta  trapezoid  outlined  in  white.    If  a  glideslope failure is detected, the letters GS appear boxed and in red.    The  GS  pointer  and  scale  will  be  removed  from the  display.    The  GS  pointer  moves  a  maximum  of ± 2.5 dots. The  VNAV  deviation  pointer  is  a  magenta  start outlined in white.  When a VNAV failure is detected the VNAV  annunciation  appears  boxed  and  in  red.    The VNAV pointer and scale will be removed.  The pointer moves a maximum of ± 2.5 dots. Table 3B-1.  Flight Director Annunciations ANNUNCIATOR FIELD FD ANNUNCIATOR INPUT MFD ANNUNCIATION Lateral Arm NAV Arm (while LOC is NOT the NAV source) NAV (Upper Left-White) NAV Arm (while LOC is the NAV source) APR Lateral Arm BC Arm APR (Upper Left-White) VOR APR Arm Lateral Capture BC Capture APR (Upper Left-Green) VOR APR Capture NAV Capture (while LOC is NOT the NAV source) NAV NAV Capture (while LOC is the NAV source) APR Lateral Capture HDG HDG (Upper Left-Green) GA GA LNAV NAV Vertical Arm 1 APPR Arm GS (Upper Right-White) Vertical Arm 2 ALTS Arm ALTS (Upper Right-White) Vertical Capture APPR CAPT GS (Upper Right-Green) ALT Hold ALT ALTS Capture ALTS IAS IAS VS VS GA GA