TM 1-1510-218-10 3-7 6.  Press  ENT.    The  database  region and expiration date of the database  presently  loaded  will  be displayed.  If the database is out of date,  the  word  EXPIRES  changes to EXPIRED. 7.  Press   ENT    to    acknowledge    the information   on   this   page   and   to continue    the    update    procedure.   The estimated load time in minutes is displayed. 8.  Press   ENT    to    acknowledge    the estimated    load    time    and    begin erasing the existing database.  The unit will display ERASING DATABASE.    After  the  database has   been   erased,   loading   of   the new database will begin automatically.    As  the  new  data  is loaded,  the  percentage  of  transfer will be displayed. 9.  When    disk    1    is    complete,    the screen will display, "Insert Disk 2."   Press any key to continue.   Remove  disk  1  and  insert  disk  2 and press any key on the computer.    The  load  operation  will continue.        If    the    database    has three     disks,     the     computer     will prompt when to insert disk 3. 10.   The   KLN   90B   will   indicate   when the   database   update   is   complete and    display    the    expiration    date.   You  may  turn  the  unit  off  at  this time  or  press    ENT  to  restart  the KLN 90B. CAUTION Update of the database must be conducted on   the   ground.      The   KLN   90B   will   not perform navigation functions during updates.    An  update  of  database  requires 10 minutes.  The  accuracy  of  the  database  information is only assured if it is used before the end of the effective period. The KLN 90B contains an internal lithium battery that is used to retain the user-defined database as well as the flight plans. The KLN 90B was designed to provide worldwide navigation  coverage from North 74^o latitude to   South   60^o  latitude.    Outside  this  area,  magnetic variation must be manually entered. e.    Turn-On and Self-Test. (1)   Turn   on   the   KLN   90B   by   pressing   the power/brightness  knob  to  the   IN  position.    It  takes  a few seconds for the screen to warm up. (2)   The  Turn-On page will be displayed for a few seconds.  During this time, the KLN 90B performs an  extensive  internal  test.    When  the  internal  test  is complete, the Self-Test page will automatically replace the Turn-On page, Figure 3-4. Figure 3-4.  Self-Test Page (3)   Adjust    the    display    brightness    to    the desired level by rotating the power/brightness knob. (4)   Verify  the  data  displayed  on  the  left  side of the Self-Test page is the same as is being displayed on  the  HSI's.    The  distance  field  always  displays  34.5 nm.  The deviation bar on the HSI should be indicating a  half  scale  right  deviation.    The  TO/FROM  indicator should be showing FROM.  The OBS out field always displays 315.  If the HSI is capable of being driven by the KLN 90B, the course pointer on the HSI should be driven  to  315  and  both  the  OBS  IN  and  OBS  OUT fields should be displaying 315.  The RMI field always displays  130.    The  copilot's  RMI  should  indicate  a bearing to the station of 130. (5)   If  the  KLN  90B  has  passed  the  internal Self-Test, the bottom left side of the self–test page will display   ANNUN   ON   to   indicate   that   the   external annunciators  should  all  be  illuminated.    If  a  flashing TEST  FAIL  is  displayed,  recycle  power  to  the  KLN 90B.    If  the  Self-Test  page  still  displays  TEST  FAIL, the  KLN  90B  requires  repair  and  should  not  be  used for navigation. (6)   Correct Time, Date, Position.