TM 55-1510-219-10 13. Data selector DSRTK/STS. (Observe   action   code   "02"   and   malfunction   code "49".  This indicates radial error between loaded position and INS position exceeds 62 kilometers.  Operator must evaluate possibility that INS is in error or reference point position is incorrect.  It is possible to force INS to accept updated  position  by  setting  data  selector  to  UTM  POS and    proceeding    to    step    (8)    of    procedure:    "Extra Precision    Geographic    Present    Position    Check    and Update.") 14. If   updating   is   to   be   rejected Press HOLD pushbutton. (Observe HOLD and INSERT/ADVANCE pushbutton lights  extinguish.    INS  returns  to  normal  operation.)  (e) Position update eradication: NOTE This  procedure  is  not  considered common.      Its   use   is   limited   to those  times  where  an  operational error has resulted in an erroneous position fix. 1. Data selector DSRTK/STS. 2. Key "1" Press. (Observe INSERT/ADVANCE pushbutton light illuminates, 000001 appears in right data display.) 3. INSERT/ADVANCE pushbutton Press. (Observe INSERT/ADVANCE pushbutton light extinguishes.  Within 30 seconds, data displays return to normal  with  "0"  (normal  inertial  mode)  in  last  digit  of right display.  AI will be set to approximately three times the number of hours in NAV.) (18) Flight course changes. (a) Manual flight plan change insertion: 1. WYPT CHG pushbutton Press. (Observe    WYPT    CHG    and    INSERT/    ADVANCE pushbuttons illuminate.) 2. Select   new   FROM   and   TO waypoints by pressing corresponding keys in sequence. (Observe  new  waypoint  numbers  appear  in  FROM- TO data displays as keys are pressed.) NOTE Selecting zero as FROM waypoint will    cause    desired    track    to    be defined by computed present position  (inertial  present  position plus fixes) and TO waypoint. 3. INSERT/ADVANCE pushbutton Press. (Observe    WYPT    CHG    and    INSERT/    ADVANCE pushbuttons extinguish.) NOTE Waypoint    zero    always    contains ramp   coordinates   if   no   manual flight    plan    changes    are    made. When a manual flight plan change is     made,     present     position     at instant   of   insertion   is   stored   in waypoint zero. (19) After landing procedures. CAUTION If  INS  will  be  unattended  for  an extended period, it should be shut down. CAUTION Do not leave INS operating unless aircraft    or    ground    power    and cooling air are available to system. NOTE The     INS     may     be     shut     down, downmoded    to    STBY    or    Align mode, or operated in the navigation     mode     after     landing. The determining factor in choosing     course     of     action     is expected length of time before the next takeoff. NOTE Do  not  tow  or  taxi  aircraft  during INS  alignment.    Movement  during alignment requires restarting alignment . 3-66