TM 1-1510-224-10 (10) Glideslope deviation pointer, annunciator, and   scale.      The   glideslope   deviation   pointer   shows aircraft deviation from the center of the glideslope beam. The  G  annunciator  on  the  glideslope  deviation  pointer indicates     that     the     information     being     presented     is glideslope  deviation.    Deviation  from  the  center  of  the glideslope  beam  is  measured  by  the  glideslope  scale. The distance between two dots is equal to a 0.35 degree deviation.    The  glideslope  display  will  not  be  present  on the EADI unless a valid ILS frequency has been tuned. (11) Aircraft    symbol.        The    aircraft    symbol serves   as   a   stationary   representation   of   the   aircraft. Aircraft   pitch   and   roll   attitudes   are   displayed   by   the relationship  between  the  fixed  miniature  aircraft  and  the movable    attitude    sphere.        The    inverted    V    shaped miniature  aircraft  symbol  is  flown  to  align  with  the  flight director command cue in order to satisfy the commands of the selected flight director mode. (12) Marker  beacon  annunciator.      Reception of  a  marker  beacon  signal  is  indicated  on  the  EADI  by the    illumination    of    the    appropriate    marker    beacon annunciator.    Possible  annunciations  are  outer  marker (0, blue), middle marker (M, amber), and inner marker (I, white). (13) Autopilot        engagement        annunciator. Autopilot  engagement  is  indicated  on  the  EADI  by  an annunciator placarded AP ENG (green). (14) Radio  altitude  display.    Radio  altitude  is presented  by  a  four-digit  display  from  -20  feet  to  2500 feet    above    ground    level    (AGL).        Radio    altitude    is displayed   in   blue   numbers   followed   by   RA   in   white letters.    Display  resolution  between  200  and  2500  feet AGL  is  in  10-foot  increments.    Display  resolution  below 200  feet  AGL  is  in  5-foot  increments.    The  radio  altitude display  will  disappear  from  the  EADI  when  radio  altitude is above 2500 feet AGL. (15) Decision height annunciator.  When radio altitude is less than 100 feet above the selected decision height,   a   white   box   will   appear   adjacent   to   the   radio altitude display.  When the aircraft is at or below decision height   an   amber   DH   annunciator   will   be   illuminated inside the white decision height display box on the EADI. (16) Rising  runway  radio  altitude  display.     A miniature rising runway symbol displays absolute altitude reference above the terrain.  The rising runway appears at    200    AGL    and    contacts    the    aircraft    symbol    at touchdown. (17) Inclinometer.    The  inclinometer  provides the    pilot    with    a    display    of    aircraft    slip    or    skid    for coordinating turns. (18) Expanded     localizer or rate-of-turn pointer  and  scale.    When  the  flight  director  navigation source is other than a localizer frequency, rate-of-turn is displayed   by   a   pointer   and   scale   on   the   EADI.      A standardrate  turn  (3  degrees  per  second)  is  indicated when the turn needle is deflected until the needle covers the  left  or  right  rate-of-turn  scale  mark.    When  the  flight director  navigation  source  is  a  localizer  frequency,  the rate-of-turn   pointer   an   scale   display   will   become   an expanded   localizer   pointer   and   scale   display.      The expanded  localizer  pointer  receives  raw  localizer  data from   the   navigation   receiver.      The   expanded   localizer pointer     becomes     an     extremely     sensitive     reference indicator  of  aircraft  position  with  respect  to  the  center  of the  localizer  course.    From  the  center  of  the  expanded localizer scale to the left or right scale index mark equals 33 feet deviation from the center of the localizer course. NOTE When   back   course   (BC)   has   been selected    on    the    flight    director,    or when   the   selected   course   is   more than 90 degrees from aircraft heading, expanded localizer deviation will automatically be reversed   to   provide   proper   sensing with respect to the localizer centerline,  and  amplification  will  be reduced by one half. (19) Decision  height  display.    Decision  height is  displayed  on  the  EADI  by  a  three-digit  display  in  blue numbers   followed   by   DH   in   white   letters.      Decision heights   may   be   set   into   the   display   by   the   decision height setting control on the respective display controller. Decision  heights  in  the  0  to  200  foot  range  are  set  into the display in 5-foot increments.  Decision heights in the 200  to  990  foot  range  are  set  into  the  display  in  10-foot increments. (20) Air data command display.  Flight director air   data   command   modes   are   vertical   speed   (VS)   or indicated  air  speed  (IAS).    When  an  air  data  command mode   has   been   selected   on   the   flight   director   mode selector  panel,  the  command  reference  will  appear  on the  EADI  in  blue  numbers  below  CMD  in  white  letters. The autopilot pitch wheel on the autopilot control panel is used to change the air data command reference number when operating in the VS or IAS mode.  When a vertical mode   other   than   VS   or   IAS   is   selected,   the   air   data command display will disappear from the EADI. (21) Pitch  and  roll  command  cue.    The  flight director    pitch    and    roll    command    cue    displays    the computed commands required to capture and maintain a desired   flight   path.      The   inverted   V   shaped   miniature aircraft  symbol  is  flown  to  align  with  the  flight  director command  cue  in  order  to  satisfy  the  commands  of  the selected  flight  director  mode.    The  cue  will  be  removed from view if an invalid 3-27