TM 1-1510-225-10 3B-196 3.   At  the  end  of  test  sequence  an  aural message  "TCAS  System  Test  Okay" or  "TCAS  System  Test  Fail"  will  be annunciated.    If  the   FAIL  light  stays on it denotes a failure in the transponder or units monitored by the transponder.   FAIL illuminates for one second  to  verify  operation  of  the  light and   test   mode   in   the   transponder.   Transponder  code  digits  will  display 8888   for   1   second   to   verify   that   all digit segments will illuminate. q.  Normal/In-Flight   Operation.      By   selecting TA/RA   mode,   the   system   automatically   inhibits   RA displays  when  the  aircraft  if  below  900  feet  AGL  on approach  or  1100  feet  AGL  on  climbout.   When  flying in  close  proximity  to  other  aircraft  during  takeoff  and landing this may be desirable. (1)   Takeoff. 1.   Immediately  before  beginning  takeoff, select TA/RA and 1 or  2. 2.   Select  short  range  (6  nm)  to  reduce clutter. (2)   Cruise. 1.   Select desired display range. 2.   Select    normal    or    pop-up   mode   as desired. (3)   Descent and Landing. 1.   Select short range display. 2.   Select   TA   to   eliminate   RA   displays caused    by    other    aircraft    in    close proximity. (4)   Post Flight. The recommended procedure  is  to  place  the  TCAS  in  STBY  mode  as soon as practical after a landing is completed. r.   Alternate     Operating     Procedures.           The following are suggested alternate operating procedures  for  use  in  event  a  TCAS  flag  is  displayed on  the  vertical  speed  indicator, or the   FAIL indicator on  the  transponder/TCAS  control  panel  is  lit.    RA's cannot   be   displayed   so   the   RA   flag   will   also   be displayed. (1)   V/S and RA Flags Displayed. 1.   Select TA ONLY. 2.   Traffic display will provide information, including  TA's  relative  to  intruders in your area. Do  not  maneuver  the  aircraft  solely  with reference    to    information    on    the    traffic display. (2)   RA  Flag  Displayed.    Appearance  of  this flag on the vertical speed indicator indicates failure of the   RA   functions   of   the   TCAS.      Follow   the   same procedure as in r(1) above. (3)   TCAS   Flag   Displayed.      Appearance   of this  flag  indicates  failure  of  some  part  of  the  TCAS system.  This includes the associated display systems as   well   as   the   units   generating   the   major   TCAS functions and signals. 1.   Verify that  ATC  FAIL  indicator  is  not lit.    If  lit,  refer  to  ATC  FAIL  indicator procedures.    If  not,  continue  with  the following procedures. 2.   Select TA ONLY. Do  not  maneuver  the  aircraft  solely  with reference    to    information    on    the    traffic display. 3.   If  TCAS  flag  is  replaced  by  TA  ONLY message, continue TCAS operation in TA mode. 4.   If    TCAS    FAIL    flag    remains,    select XPDR or  STBY as TCAS is no longer available. 3B-35.  LIGHTNING DETECTION SYSTEM  (WX-1000E). a.   Description. The Stormscope system consists of three components that defect,  locate, and map    areas    of    vertical    electrical    discharge    activity contained within thunderstorms.  The antenna mounts externally     to     the     aircraft     and     detects     electrical discharges    associated    with    thunderstorms    over    a 125,000  square  mile  area  around  the  aircraft.    The processor analyzes this information to aid in identification of valid electrical discharges from lightning   and   to   determine   range   and   azimuth   for display  in  the  cockpit.    The  analysis  is  completed  in milliseconds.      The   location   of   a   vertical   electrical discharge  associated  with  thunderstorm  is  plotted  on WARNING WARNING