TM 1-1510-225-10 3B-15 e.   Lateral Deviation.  The pointer and scale are located on the bottom  center of the ADI.  The pointer moves a maximum of     2.5  dots.    The  scale  consists of two white dots on either side of a white center index. The lateral deviation pointer is a white rectangle with two magenta bars for VOR, or non-approach FMS navigation sources.    The  rising  runway  serves  as  the lateral  deviation  pointer  for  LOC,  BC,  and  approach FMS    course    sources.        Back    course    deviation    is reversed on the ADI when the B/C  is  set  via  the  flight director control panel. If the navigation source is invalid or  missing, the course  source  annunciation  is  boxed  in  red  and  the pointer,  rising  runway  (LOC,  BC,  or  FMS  approach), and   lateral   deviation   scale   are   removed   from   the display. The  FMS  Navigation  warning  indicates  that  the information  accuracy  is  in  question  but  usable.    The FMS   navigation   solution   remains   displayed   but   the color changes to yellow. f.    Rate    of    Turn    Indicator.        The    indicator displays turn rate information.  It is located below the lateral deviation scale and consists of a three bar scale with   an   indicator   shown   as   a   white   bar   outlined   in black.      The   pointer   will   deflect   either   left   or   right indicating  the  turn  rate  in  that  direction.    The  pointer moves a maximum of 2 bars, twice the standard rate turn.  Refer to Table 3B-2. Heading  data  is  used  to    calculate   the   rate   of turn.    If  this  source  is  flagged,  the  rate  of  turn  goes invalid.   The  pointer  and  scale  are  removed  when  the rate of turn is invalid. Table 3B-2.  Rate of Turn Scale DOT DEVIATION DEGREES PER SECOND UNITS 2 Needle Widths (1 bar) 3/Sec Standard Rate Turn 4 Pointer Widths 6/Sec Twice Standard Rate Turn g.  Rising Runway.  The rising runway is shown in  green,  white,  and  magenta,  outlined  in  black  when the course source is a localizer, back course, or FMS approach  mode.    During  localizer  or  FMS    approach deviation, the pointer is a trapezoidal runway symbol.   When the radio altitude reaches 200 feet while in LOC, BC, or FMS approach mode, the runway symbol starts to  rise.    The  symbol  achieves  maximum  height  when the  radio  altitude  is  at  a  value  of zero feet.  The rising runway  correlates  to  approximately  the  bottom  of  the aircraft  symbol.    If  the  Localizer  or  FMS  deviation  is invalid    or    unavailable    the    rising    runway    will    be removed.    If  the  radio  altitude  fails  the  rising  runway does not rise. h.  Radio   Altitude   Display.    Radio   altitude   is displayed  in  white  above  the  decision  height  readout area.    The  display  appears  automatically  when  within the radio altitude range (2500 feet) and changes to 50- foot  increments  between  2500  and  1000  feet,  10-foot increments   between   999   and   100   feet,   and   5 -foot increments below 99 feet. NOTE Loss  of  radio  altitude  data  will  cause  loss of    the    TCAS    II    due    to    the    absence    of required input data. Radio    altitude    data    is    rate-limited   to   prevent nuisance  radio  altimeter  changes as the result of fast changing  data  (uneven  terrain).    The  digital  readout will blank for valid radio altitude data less than 0 feet or over 2500 feet. When   a   failure   is   detected,   the   radio   altitude display  is  dashed  red  and  the  black  letters  RA  in  a solid  red  box  is  annunciated.    DH  set  and  the  DH annunciator are also removed. i.    Decision   Height   Set   Readout.      Decision height set is displayed in the lower right corner and is green.  If the radio altimeter system fails, the decision height readout is removed. When  the  radio  altitude  is  at  or  below  the  DH setting, the yellow letters DH appear in the right center portion     of     the     ADI     or     PFD     display.          The     DH annunciation  flashes  for  10  seconds  after  it  appears.   Once the DH annunciation appears, it will be removed when  the  radio  altitude  climbs  at  least  25 feet above the decision height setting or if the radio altitude is less than  10  feet.    If  the  radio  altimeter  system  fails,  the decision  height  annunciator  is  removed  and  the  radio altitude flag appears. j.    Fast/Slow  Deviation  and  Pointer.    Speed deviation indicates whether the aircraft is fast or slow relative    to    an    established    reference.        The    speed deviation  scale  consists  of  four  white  dots  with  the letters F and S to the left of the top and bottom dots.   The scale  is located on the left side of the ADI.  The speed deviation pointer is a magenta diamond outlined in white.  The scale is relative to FMS speed (FSPD) associated   with   FMS   1.      Whenever   FMS   speed   is available the letters FSPD in white is positioned below the  scale.    When  selected,  Fast/Slow  input  is  invalid