TM 55-1510-220-10 4. Flight   Director/Autopilot   A   15'   right steering command is issued. 5. Mission Control Panel TACAN UPDATE  and  DATA  LINK  UPDATE annunciators illuminated. (g)     CDU TEST  switch Hold depressed and rotate AUTO-MAN  switch  to  AUTO.    Observe  all indications are as in step (6) except at 15', left steering   command   is   issued.      On   HSI,   all angles  are  "0°"  and  cross-track  deviation  bar is one dot left. (h)     CDU    TEST    switch    Release.        If    desired, decouple INS.  Observe that operation returns to normal. (4) Insert present position: NOTE Prior to pressing INSERT/ADVANCE pushbutton,    any    incorrectly    loaded data can be corrected by pressing the CLEAR    pushbutton    and    reloading correct data. NOTE While  parked  aircraft  is  undergoing alignment,    encoding    altimeter    will supply    the    field    elevation    (aircraft pressure altitude) into INS. NOTE Once present position has been inserted  and  computer  has  advanced to alignment state "7", present position  cannot  be  reinserted  without downmoding  to  STBY  and  restarting alignment. NOTE If  longitude  and  latitude  coordinates are   being   used,   skip   step   4   (a)   and proceed with step 4 (b). (a) Insert UTM coordinates of aircraft present position: 1. Data selector UTM POS.  Observe that prior to initial load, INSERT/ADVANCE pushbutton annunciator illuminates. 2. To  load zone  and easting values Press keys   in   sequence,   starting   with   "E". Example:  Zone  16,425  km  East  =  E16 425.  Observe that zone and easting in kilometers  appear  in  right  data  display as keys are pressed. 3. INSERT/ADVANCE               pushbutton Press.  Observe pushbutton annunciator remains illuminated. 4. To  load  northing  data  Press keys in sequence,  starting  with  "N"  or  "S"  to indicate   north   or   south   hemisphere. Example:  North  =  N  4749.    Observe northing  kilometers  appear  in  left  data display as keys are pressed. 5. INSERT/ADVANCE               pushbutton Press.      Observe   that   the   pushbutton light remains illuminated. 6. INSERT/ADVANCE               pushbutton Press.    Observe  extra  precision  display for     present     position     northing     and easting, to the nearest meter, appears in left and right data displays, respectively. 7. To   load   extra   precision   easting   data Press  keys  in  sequence,  starting  with "E".    Example:  297  m  East  =  E  297. Observe  that  easting  meters  appear  in right data display as keys are pressed. 8. INSERT/ADVANCE               pushbutton Press.  Observe pushbutton annunciator remains illuminated. 9. To   load  extra  precision northing data Press.    Keys  in  sequence,  starting  with "N"  or  "S".    Example:  901  m  North  = N.        Observe    that    northing    meters appear in left data displays as keys are pressed. Change 2    3-53