TM 1-1510-225-10 3A-57 Figure 3A-33.  VNAV 1/3 Page d.     No  SXTK (selected crosstrack) may be programmed. e.     Cross  track  must  be  less  than 12.5 nautical miles. 2   INACTIVE.  INACTIVE displayed in the VNAV mode line indicates that the VNAV function is not activated. NOTE A    crosstrack    (XTK)    of    more    than    125 nautical miles will cause VNAV mode to be inactive. When  VNAV  mode  is  inactive  all  external VNAV     outputs     are     disabled,     including VERT   DEV,   EFIS   altitude   constraints   at waypoints, and VNAV WPT ALERT annunciation. 3   CLIMB.   When CLIMB is displayed on this line, the altitude that must be gained to reach cruise   altitude   or   to   the   next   altitude   restriction   is shown in the right field. 4   CRUISE. When CRUISE is displayed    on    this    line,    the    altitude    that    must    be maintained    while    en    route    to    the    top    of    descent (#TOD) point will be shown in the right field. 5   PATH DESCENT. PATH DESCENT  displayed  on  this  line  indicates  a  descent via a programmed flight path angle.  Vertical deviation (VERT  DEV)  will  be  enabled  on  the  glideslope  needle on EHSI. 6   DESCENT.    DESCENT  displayed on this line indicates non-path  or  air  mass  descent  to altitude restriction. 7   LEVEL.    LEVEL  displayed  on  this line  indicates  that  the  aircraft  should  fly  level  to  the next altitude constraint. (b)   TO    Waypoint    Line    (Second    Line).   This  line  displays  the  vertical  TO  waypoint  with  the constraint    altitude    and    applicable    waypoint    offset, where  FL  =  flight  level,  A  =  at  or  above,  B  =  at  or below,   G   =   glide   path,   and   a   blank   space   =   at constraint altitude. 1   #TOC.      #TOC   displayed   on   this line  will  have  the  top  of  climb  target  cruise  altitude displayed in the right field, the top of climb will become the  vertical  to  waypoint  once  the  aircraft  has  passed the final climb restriction waypoint and is still climbing. 2   #TOD.      #TOD   displayed   on   this line  will  have  the  top  of  descent  target  cruise  altitude displayed in the right field.  The top of descent altitude is   the   point   at   which   the   aircraft   should   begin   to descend   in   order   to   reach   the   descent   reference waypoint at the required altitude. NOTE If    no    descent    reference    waypoint    with crossing altitude is programmed, the system   will   use   the   arrival   airport   and elevation   to   fix   the   TOD   as   long   as   an airport  is  the  last  waypoint  on  the  active flight plan. (c)   EST   CROSSING.       The   estimated crossing  altitude  (EST  CROSSING)  is  the  altitude  at which  the  aircraft  is  estimated  to  be  when  it  crosses the to waypoint based on its current groundspeed and vertical  speed.   This  field  will  display  RANGE  (NM)  in miles    and    tenths    of    a    mile    when    the    vertical    to waypoint is a #TOD or #TOC profile point. (d)   ETE.    The  estimated  time  en  route (ETE) from the aircraft's present position to the vertical to waypoint, #TOC, or #TOD is displayed in this field in hours, minutes, and tenths of a minute. (e)   REQUIRED FPM.   REQUIRED FPM (required    feet    per    minute)    is    the    vertical    speed, required  to  satisfy  the  altitude  constraint  UP  indicates  a  positive  vertical  speed  and  DN  indicates  a  negative vertical speed.  This field will display @#TOD FPM DN when the vertical to waypoint is the top of descent and indicate the descent target vertical speed. (f)    ACTUAL FPM.   This line displays the actual  vertical speed in feet per minute.  UP indicates a  positive  vertical  speed  and  DN  indicates  a  negative vertical speed.