TM 1-1510-225-10 3A-111 (a)   OFF.   The OFF position disables the ART     (antenna,     receiver,     and     transmitter)     power supply.      OFF   is   displayed   below   the   NAV   source annunciator on the radar mode line. (b)   STBY.      After    30    seconds    in    the standby   (STBY)   mode   the   system   is   in   a   state   of readiness.      No   radar   transmission   occurs,   and   the antenna   is   parked   in   the   down   position.      STBY   is displayed  below  the  NAV  source  annunciator  on  the radar mode line, if a weather mode is selected. (c)   TST.          Selecting     the     test     (TST) position causes the test pattern to be displayed on the indicator, if a weather mode is selected.  TEST will be displayed  below  the  NAV  source  annunciator  on  the radar mode line. NOTE If    ON    is    selected,    the    radar    antenna, receiver, and transmitter (ART) is operational.    However,  if  a  weather  radar mode  is  not  selected  for  display,  the  ART will be placed in standby by the EFIS. (d)   ON.          Selecting     ON     selects     the condition   of   normal   operation,   allowing   for   weather detection or other modes of operation.  Depending on the selected mode of operation, Wx, WxA, or MAP will be  displayed  below  the  NAV  source  annunciator  on the radar mode line. (2)   Weather     Push-Button     Mode     Selector Switch.      The    weather    push-button   mode   selector switch, placarded   Wx,  is  used  to  select  the  weather mode (Wx) when pressed.  Wx will be displayed below the NAV source annunciator on the radar mode line, if a weather mode is selected. (3)   Weather Alert Push-Button Mode Selector Switch.   The weather alert push-button mode selector switch, placarded  WxA, is used to select the weather alert mode (WxA) when pressed.  WxA will be displayed  below  the  NAV  source  annunciator  on  the radar mode line, if a weather mode is selected. (4)   Ground  Map  Push-Button Mode Selector Switch.    The  ground  map  push-button  mode  selector switch, placarded   GND  MAP,  is  used  to  select  the ground  mapping  mode  when  pressed.    MAP  will  be displayed  below  the  NAV  source  annunciator  on  the radar  mode  line.    The  color  magenta  is  not   active in the ground-mapping mode. (5)   Lightning Display Push-Button Mode Selector   Switch.      The   lightning   push-button   mode selector switch, placarded with a lightning bolt, is used to   enable   the   lightning   display   when   pressed,   if   a weather mode is selected for display. (6)   Display  Brightness  Control.    The display brightness   control,   placarded   BRT   OFF,   is   used   to adjust display brightness. (7)   Tilt/Stabilization Control. The tilt/ stabilization control, placarded   TILT  UP  /  DN,  PULL STAB OFF, permits manual adjustment of antenna tilt (15  up  or  down)  to  enable  the  pilot  to  analyze  the weather presentation.  The tilt angle is displayed below the     NAV     source     annunciator     on     the     radar     tilt annunciator line. Pulling out on the tilt selector knob will turn radar stabilization  off.    STAB  OFF  will  appear  on  the  radar fault/warning   line   displayed   below   the   NAV   source annunciator  just  under  the  antenna  tilt  annunciation line. (8)   Right   And   Left   Track   Controls.      If  the weather  only  mode  is  selected,  pressing  the    TRK switch  activates  and   slews  a  yellow  dashed  azimuth line.    It  also  activates  a  digital  display  showing  the number  of  degrees  the  azimuth  line  is  located  left  or right  from  the  nose  of  the  aircraft.    In  any  other  map weather presentation, only the yellow dashed line will be displayed. (a)   Track   Control   Operation   In   Vertical Profile  Mode.    Prior  to  engaging  VP,  the  appropriate button  (left  or  right)  is  used  to  place  the  track  line  at the   desired   azimuth   angle   to   be   vertically   scanned (sliced).  When VP is engaged, the slice will be taken at the last position of the track line, whether it is visible or  not.    If  the  track  line  has  not  been  selected  after power   has   been   applied   to   the   system   and   VP   is engaged, the slice will be taken at 0 degrees (directly in front of the aircraft). When  in VP mode, pressing the  TRK switch will change the selected azimuth two degrees left or right, depending upon which button is pressed.   Continuously holding the  TRK button will result in the system slicing in 2-degree increments. (9)   Vertical Profile Push-Button Mode Selector Switch.   Once  the  desired  azimuth  has  been selected   with   the   TRK   switch,   pressing   the   vertical profile   push-button  mode  selector  switch,  placarded VP, selects the vertical profile mode of operation, and causes   the   vertical   profile   screen   to   appear.      The weather mode of operation (Wx, WxA, or GND MAP) displayed in the lower left comer of the display will be the  same  as  existed  just  prior  to  selecting  VP.    To select a different weather mode once in vertical profile,