TM   55-1520-240-T 18-4.3 HF  LIAISON  FACILITY  OPERATIONAL  CHECK  (CONTINUED) TASK RESULT CHECK   TSEC/KY-100   PROCESSOR 19.  Turn  KY-100  Control  (5)  MODE  switch  (9) to OFFLINE and PRESET switch (17) to MAN.  Connect  a  fill  device  to  KY-100 Control  (5)  fill  connector  (18).  Push  up arrow  (22)  until  KEY  OPS  is  displayed  on display  (10).  Push  INIT  button  (19)  to display  LOAD  KEY.  Push  INIT  button  (19), LOAD  N  with  a  flashing  N  will  be  shown on  KY-100  Control  (5)  display  (IO),  where the  N  indicates  currently  selected  key location,  which  can  be  changed  by pressing  the  up  or  right  arrow  as  needed. Press  INlT  button  (19).  The  entire  LOAD N  message  will  now  be  flashing.  Turn  on fill  device  and  select  key  to  be  loaded. Press  the  INIT  button  (19)  on  KY-100 control  (5).  When  keyfill  is  complete,  turn off  and  disconnect  the  fill  device  from  KY- 100  control  (5).  Rotate  KY-100  Control (5)  Mode  switch  out  of  OFFLINE  to  exit key  load. NOTE Perform  the  following  step  after  all  checks  are complete  and  just  before  shutdown. 20.  Pull  the  KY-100  Control  (5)  Mode  Switch  (9) and  rotate  it  to  Z  ALL  position. SECURE  VOICE  CHECK  - RT-17429/URC     AND     TSEC/KY-100 NOTE Ensure both KY-100 and HF Radio have appropriate  keys  loaded  for  mode  used. Upon  completion  of  a  successful  load,  a  pass tone  will  be  heard  and  the  display  (10)  will momentarily  indicate  KEY  N,  where  N  is  the  key location  loaded.  If  this  does  not  occur,  go  to  task 18-4.18.  The  display  (10)  will  then  display, LOAD  N  with  N  flashing.  This  step  can  be repeated  to  load  additional  keys. All  keys  stored  in  locations  1  thru  6  and  U  will  be erased.  The  KY  Control  (5)  will  display  ZEROED and  a  tone  will  be  audible  in  headset.  When MODE  switch  is  rotated  out  of  Z  ALL  position, PUSH INIT will be displayed meaning a COLD START  is  needed  (a  keyfill  is  necessary).  If ZEROED is not seen on KY-100 Control (5) display  (10),  tone  is  not  heard  in  headset,  or PUSH  INIT  is  not  displayed  when  rotated  out  of  Z ALL  position,  go  to  task  18-4.19. 21.  Utilizing  a  known  functional  ground  station with  compatible  HF  and  KY-100  keys  loaded and  an  appropriate  test  frequency,  turn aircraft  KY-100  Control  (5)  Mode  switch  (9) to  CT.  Go  into  CT  menu  and  set  to  CT.  Set ground  station  KY-100  Control  Mode  switch to  PT.  Transmit  from  ground  station  to aircraft  HF  system. The  PT  annunciator  should  be  lit  on  the  KY-100 Control  (5)  Display  (10)  and  plaintext  should  be heard  in  the  headset.  If  neither  occur,  go  to  task 18-4.20. 18-4.3 TASK RESULT 22.   Utilizing   a   known   functional   ground   station with  compatible  HF  and  KY-100  keys  loaded and  an  appropriate  test  frequency,  turn  the aircraft  KY-100  Control  (5)  Mode  switch  (9) to  CT.  Go  into  the  CT  menu  and  set  to  CT. Set   the   ground   station   KY-100   Control   Mode switch   to   CT.   Transmit   from   the   ground station  to  aircraft  HF  system. 23.   Utilizing   a   known   functional   ground   station with   compatible   HF   and   KY-100   keys   loaded and  an  appropriate  test  frequency,  turn  the aircraft  KY-100  Control  (5)  Mode  switch  (9) to  CT.  Go  into  the  CT  menu  and  set  to  CT. Set   the   ground   station   KY-100   Control   Mode switch  to  CT.  Transmit  from  the  aircraft  HF system  to  the  ground  station. 24.   Utilizing   a   known   functional   ground   station with   compatible   HF   and   KY-100   keys   loaded and  an  appropriate  test  frequency,  turn  the aircraft  KY-100  Control  (5)  Mode  switch  (9) to  CT.  Go  into  the  CT  menu  and  set  to  CT ONLY.  Set  the  ground  station  KY-100  Control Mode  switch  to  PT.  Transmit  from  the  ground station  to  aircraft  HF  system. 25.   Utilizing   a   known   functional   ground   station with   compatible   HF   and   KY-100   keys   loaded and  an  appropriate  test  frequency,  turn  the aircraft  KY-100  Control  (5)  Mode  switch  (9) to  PT.  with  the  CT  menu  set  to  CT.  Set  the ground  station  KY-100  Control  Mode  switch to  CT.  Transmit  from  the  ground  station  to aircraft  HF  system. SYSTEM  SHUTDOWN 26.  Rotate  HF  Control  (4)  Function  Switch  (7)  and KY-100  Control  (5)  Mode  Switch  (9)  to  OFF. Pull  HF  (COMM)  and  HF  KY-100  (COMM) circuit  breakers  on  No.  2  pdp. 27.  Stop  APU.  Refer  to  task  15-1.5. FOLLOW-ON MAINTENANCE: TM   55-1520-240-23: Electrical  Power  Off Battery   Disconnected The  RX  and  V  annunciators  should  be  lit  on  the KY-100  Control  (5)  Display  (10)  and  plaintext should  be  heard  in  the  headset.  If  neither  occur, go  to  task  18-4.21. The  TX  and  V  annunciators  should  be  lit  on  the KY-100   Control   (5)   Display   (10)   in   the   aircraft and   plaintext   communication   should   be   heard   at ground  station.  If  neither  occur,  go  to  task  18- 4.21. No  communication  should  be  audible  in  the aircraft  headset. If  communication  does  come thru,  go  to  task  18-4.21. No  communication  should  be  audible  in  the aircraft  headset. If  communication  does  come thru,  go  to  task  18-4.21. APU ON capsule shall go out. GO   TO   THE   NEXT   PAGE Change   21 18-105