TM 1-1510-225-10 3D-57 (a)   The Destination Waypoint.  An arrow is displayed to the left of the identifier if the waypoint is the active waypoint. (b)   The  fuel  units  as  received  from  the AETM. (c)   The Fuel Presently On Board (FOB).   To change the present fuel on board: 1.   Turn to the OTH 5 page. 2.   Press the left  CRSR button to turn on the cursor function. 3.   Enter   the   current   fuel   on   board using    the    left    inner    and    outer knobs. 4.   Turn the cursor function off. (d)   The     fuel     required     to     reach     the destination waypoint at the current rate of fuel flow and the present groundspeed (REQD). (e)   The landing fuel on board (L FOB) is the  original  fuel  on  board  minus  the  total  fuel  required to reach the destination. (f)    The desired fuel reserve (RES) is the amount of reserve fuel the pilot has entered.  The fuel must  be  entered  in  the  same  units  displayed  on  the first  line.    To  enter  the  reserve,  press  the  left   CRSR button,  rotate  the  left  outer  knob  to  move  the  cursor over the RES field.  Use the left inner and outer knobs to enter the desired fuel quantity.  Press the  left CRSR button to turn off the left cursor function. (g)   The  calculated  extra  fuel  (EXTRA)  is the   landing   fuel   on   board   (L   FOB)   minus   the   fuel reserve (RES). (2)   OTH  6  Page.    The  OTH  6  page  displays the following.  Refer to Figure 3D-76. OTH 6 FUEL DATA ENDUR 2:10 RANGE  580 NM/LB 0.44 RES:   500 Figure 3D-76.  OTH 6 Page (a)   The   endurance   (ENDUR)   in   hours and  minutes.    The  endurance  is  calculated  based  on the  amount  of  fuel  remaining  after  subtracting  out  the reserve (RES) entered on the OTH 5 page or the OTH 6 page from the present fuel on board. (b)   The   range   (RANGE),   which   is   the distance in nautical miles that could be flown based on the    endurance    calculated    above    and    the    present groundspeed. (c)   The    fuel    efficiency,    which    is    the groundspeed divided by the present fuel flow. (d)   The     desired     fuel     reserve     (RES).   Same as displayed on the OTH 5 page.  Changing the reserve on one of the two pages also changes it on the other page. (3)   OTH  7  Page.    The  OTH  7  page  displays rate of fuel flow as depicted in Figure 3D-77. OTH 7 FUEL FLOW      LBS/HR ENG 1   301 ENG 2   295 TOTAL   596 Figure 3D-77.  OTH 7 Page (4)   OTH  8  Page.    The  OTH  8  page  displays the amount of fuel used as depicted in Figure 3D-78. OTH 8 FUEL USED         LBS ENG 1   308 ENG 2   301 TOTAL   609 Figure 3D-78.  OTH 8 Page