TM 1-1510-224-10 CAUTION Do   not   operate   the   weather   radar system in a confined space where the nearest metal wall is 50 feet from the antenna    reflector.        Scanning    such surfaces within 50 feet of the antenna reflector may damage receiver crystals. NOTE The  weather  radar  system  should  be tested     before     each     flight     during which the system is to be used. H 10.   Weather radar Test and set as required: a. RADAR mode selector switch SBY. b. LSS mode selector switch SBY. c. WX pushbutton selector switch (display controller) Depress. Observe   that   EHSI   displays   partial compass heading arc. WARNING The  radar  transmitter  is  radiating  X band  microwave  energy  when  in  the test (TST) mode. d. RADAR mode selector switch TST. Observe   that   WX   mode   annunciator   on EHSI remain STBY. e. Range     switches     (radar     control     panel) Depress    both    switches    simultaneously. Observe   that   WX   mode   annunciator   on EHSI  changes from   STBY to   TEST,  and that  magenta,  red,  yellow,  and  green  are displayed.  A green noise band will appear at the upper arc range marking. f. RADAR  mode selector switch   SBY,  then as required. g. Range     switches     (radar     control     panel) Select 50 NM or greater. h. LSS mode selector switch  CLR TST. i. EHSI   Verify   that   a   white   lightning   rate symbol  appears  at  approximately  25  NM at    45    degrees    right    of    center    and    a magenta lightning alert symbol is displayed  at  maximum  selected  range  at 45 degrees right of center. j. LSS   mode    selector    switch    SBY    or    as required. NOTE While  the  aircraft's  weight  is  on  the wheels,  the  weather  radar  system  is forced  into  the  standby  mode.    This is  a  safety  feature  that  prevents  the radar from transmitting on the ground,   to   eliminate   the   microwave radiation hazard. * 8-23.  BEFORE TAKEOFF. (1) AUTOFEATHER switch ARM. (2) PNEU  &  ENVIRO  BLEED  AIR  valves  (2) As required. CAUTION Do  not  use  pitot  heat  more  than  15 minutes  while  the  aircraft  is  on  the ground.      Overheating   may   damage the heating elements. (3) ICE  &  RAIN  switches  As  required.    As  a minimum,    PITOT,    STALL    WARN,    and FUEL VENT switches shall be ON. (4) Fuel  panel  Check  fuel  quantity  and  switch positions. 5. Flight   and   engine   instruments   Check   for normal indications and EFIS display controller is set to desired setting. (6) CABIN CONTROLLER Set. 7. Annunciator panels Check (note indications). 8. Flaps As required. 9. Trim Set. (10) ASE/ACS Set. (11) Avionics Set. 12. Flight controls Check. H 13.   Departure    briefing    (paragraph    8-52) Complete. * 8-24.  LINE UP. (1) ENG ANTI-ICE switches As required. (2) Engine AUTO IGNITION switches ARM. 3. PROP levers HIGH RPM. 8-21