TM 1-1510-225-10 3A-33 on  the  flight  director  mode  selector  panel  has  been selected and is engaged. (c)   IAS  Mode  Annunciator.    Illumination of the green indicated airspeed hold mode annunciator, placarded IAS, indicates that the indicated   airspeed   hold   mode  on  the  flight  director mode    selector    panel    has    been    selected    and    is engaged. (d)   GS  Mode  Annunciator.    Illumination of  the  green  glideslope  mode  annunciator,  placarded GS,  indicates  that  the  approach  mode  on  the  flight director  mode  selector  panel  has  been  selected  and has captured the glideslope. (e)   GA  Mode  Annunciator.    Illumination of the green   go-around  mode  annunciator,  placarded GA, indicates that the GO AROUND  switch on the left power  lever  or  the   GA  switch  on  the  copilot's  control wheel has been pressed and the go-around mode has been initiated. (f)    PIT  Mode  Annunciator.    Illumination of  the  green  pitch  mode  annunciator,  placarded   PIT, indicates   that   the   vertical   trim   thumbwheel   on   the autopilot controller is being operated. (g)   ALTC Mode Annunciator.   Illumination  of  the  green  altitude  hold  capture  mode annunciator,    placarded     ALTC,    indicates    that    the selected altitude has been captured. (h)   VNAV Mode Annunciator.   Illumination   of   the   green   vertical   navigation   mode annunciator,    placarded     VNAV,    indicates    that    the vertical  navigation  mode  on  the  flight  director  mode selector panel has been selected and is engaged. (i)    H   /   L   /   N   CLB  Mode  Annunciator.   Illumination  of  the  green  high,  low,  or  normal  climb profile  mode  annunciators,  placarded   H  /  L  /  N  CLB, indicates  that  the  high,  low,  or  normal  climb  profile mode  on  the  flight  director  mode  selector  panel  has been selected and is engaged. (j)    H  /  L  /  N  DES   Mode  Annunciator.   Illumination  of  the  green  high,  low,  or  normal  descent profile  mode  annunciators,  placarded   H  /  L  /  N  DES, indicates  that  the  high,  low,  or  normal  descent  profile mode  on  the  flight  director  mode  selector  panel  has been selected and is engaged. (5)   Radio   Altimeter   Digital   Altitude   Display and  Annunciator.    Radio  altitude  is  displayed  in  the upper  right  corner  of  the  EHSI  in  feet  above  ground level. (6)   Radio Altimeter Annunciator. Radio altimeter operation   is  indicated  by  a  white  RA  below the radio altitude display. (7)   Horizon  Line  With  Heading  Scale.    The horizon line displays aircraft pitch and roll attitude with respect to the earth's horizon. (8)   Airspeed  Fast/Slow  Or  Angle  Of  Attack Indicator And Scale.    The  fast/slow or angle of attack display  is  located  on  the  opposite  side  of  the  EADI from   the   glideslope   display,   and   consists   of   two vertical  white  unfilled  diamonds  and  one  white  unfilled circle.        The    fast/slow    scale    and    indicator    will    be displayed when the airspeed is within 10 knots more or less   than   the   selected   hold   airspeed.      The   scale provides a ± 10 knot airspeed indication range. (9)   Airspeed   Fast/Slow   or   Angle   of   Attack Scale  Command  Bars.    If  airspeed  is  the  referenced data, AS will be annunciated on the pointer.  If angle of attack  is  the  referenced  data,  AN  will  be  annunciated on the pointer. (10)   Lateral Deviation Scale Annunciator.  The lateral   deviation   scale   annunciator   displays   LOC   to indicate  that  localizer  information  is  being  provided  by the lateral deviation indicator and scale. (11)   Decision Height Annunciator. The decision height annunciator, placarded  DH, illuminates when the selected decision height has been reached. (12)   Decision    Height    Digital    Display.        The decision height digital display in the lower right corner of the EADI indicates selected decision height. (13)   Lateral    Deviation    Scale.        The    lateral deviation  scale,  located  at  the  bottom  center  of  the EADI provides a lateral reference for the rising runway symbol when ILS is selected.  As an expanded scale, it  represents  1/2  full-scale  deviation  as  displayed  on the   EHSI.      When   the   selected   course   and   aircraft heading differ by more 105, the left/right sense will be reversed  and  BC  will  be  displayed  to  the  left  of  the center diamond to indicate that back course information is being displayed. (14)   Rate    Of    Turn    Scale.        The   rate   and direction of turn is indicated by the rate turn scale and pointer   and   indicator,   located   at   the   bottom   of   the EADI. (15)   Inclinometer. Deflection of the inclinometer  ball  from  the  center  of  the  inclinometer tube   indicates   that   the   aircraft   is   in   a   slipping   or skidding turn depending on turn direction.