TM 1-1510-224-10 A  waypoint  change  to  00  will  cause  the  computer  to enter   the   pattern   steering   mode.      The   coordinates   for waypoints  1,  2,  3,  and  4  will  be  saved  and  replaced  with computed  waypoints  for  the  pattern.    Waypoints  0  and  4 will be the initial point (IP) for the pattern.  The differences between    the    pattern    steering    mode    and    the    normal steering mode are: Automatic  leg  switching  will  occur  when  directly  over the destination waypoint. Leg switching can only be accommodated automatically.    If  MAN  leg  changing  was  specified  on  the INS  SETUP  page,  the  aircraft  will  continue  on  the  same path   with   a   flashing   WAYPOINT   ALERT   lamp   until   leg changing is changed to AUTO on the MFD. The  approach  to  the  base  or  return  legs  will  be  at  90 degrees versus the normal approach of 45 degrees. The program is designed to overfly all waypoints with a  minimum  of  overshoot,  provided  sufficient  distance  to the  return  leg  has  been  entered.    When  coupled  to  the autopilot,    up    to    three    maximum    bank    turns    may    be commanded while performing the 180 degree return. The    pattern    steering    mode    is    exited    when    the operator inserts a valid non 00 leg switch command.  The original  set  of  four  waypoint  coordinates  will  be  returned to their former location. d. Normal Operating Procedures. (1) Preflight procedure. 1. GPU Connected. 2. BATTERY switch ON. 3. Overhead and mission panel switches Set as follows: a. Aircraft    #1    and    #2    INVERTER switches ON. b. AUTO PLT POWER switch ON. c. AVIONICS MASTER POWER switch EXT PWR. d. #1 and #2 EFIS POWER switches ON. e. #1 and   #2   three   phase   inverter switches RESET/ON. f. BUS CROSS TIE switch AUTO. g. ATT   pushbutton   selector   switch (display    controller)    Depress    as required. h. Autopilot  EFIS 1/2 switch EFIS 1. 4. INS - Align as follows: a. Mode switch B (MFD) Depress to select FPLN page. b. NAV SETUP (R5) Depress. c. INS SETUP (R5) Depress. d. INS mode selector   STBY.    (Text at L1 will be blank until INS mode selector is placed in STBY. Then,   last   align   and   last   known text will appear.) NOTE An advisory message ALIGN POSITION NOT ENTERED will appear. INS  malfunction  codes  are  shown  in  table  3-9.    INS action   codes   and   recommended   actions   are   shown   in table 3-10. e. Present  position  Enter  by  one  of the following methods: (   1)    To    accept    LAST    ALIGN coordinates,  SKPD  1,  then depress L1. (   2)   To   accept   LAST   KNOWN coordinates,  SKPD  2,  then depress L1. (   3)    SKPD in alignment coordinates,   then   depress L1. NOTE When  L1  is  depressed  INS  LOADING will appear at the top of the MFD and L1 text changes to ALIGN = X.DD.MM.SS.Y.DD.MM.SS  and  ALIGN STATE  9.    It  takes  6  to  8  minutes  for the program to load. Valid alignment data for LAT/LONG is X.DD.MM.SS.T Y.DDD.MM.SS.T, where: X = Latitude hemisphere (N or S) DD = Degrees of latitude (0 90) MM = Minutes of latitude or longitude SS = Seconds (0 59) T = Tenths of seconds (0 9) Y = Longitude hemisphere (E or W) 3-70