TM 1-1510-218-10 3-40   KPIE  UTC DEP   15:02 TIME  15:12 ETA   17:51 FLT     :10 ETE    2:39 D/T 4 Figure 3-52.  Distance/Time 4 Page (a)  Destination waypoint. (b)  Selected Time Zone.    The  time  zone may  be  changed  by  pressing  the  right   CRSR button and  using  the  right  inner  knob  to  select  the  desired time zone. (c)  Departure    Time.        There    are    two definitions  of  departure  time  depending  on  what  has been selected on the SET 4 page.  If the SET 4 page displays,  RUN  WHEN  GS  >  30  knots,  the  departure time is that time when the groundspeed first reached 30  knots.    If  instead,  the  SET  4  page  displays,  RUN WHEN POWER IS ON, the departure time is the time when power was applied to the KLN 90B. (d)  The present time. (e)  The  estimated  time  of  arrival  at  the destination waypoint. (f)   Flight Time.  If RUN WHEN GS > 30 knots is selected on the SET 4 page, flight time is the amount   of   time   that   the   aircraft's   groundspeed   has been above 30 knots.  Normally, this will be the time since  takeoff.    However,  time  spent  at  groundspeeds less than 30 knots, such as intermediate stops without shutting down power, is not counted as flight time.  If RUN WHEN POWER IS ON is selected on the SET 4 page, flight time is the time since power on. (g)  Estimated     time     en     route     to     the destination. al.    Modes   Of   Operation.      The   course   to   the active  waypoint  is  defined  by  selecting  between  two course modes, LEG and OBS.  The LEG mode means the  course  to  the  active  waypoint  is  selected  by  the KLN 90B.  It is the default mode when power is applied to the KLN 90B.  The OBS course mode is the mode that  allows  the  pilot  to  define the course to the active waypoint. The  KLN  90B  also  has  three  modes  that  are associated     with     approach     operation:     En     Route, Approach Arm, and Approach Active. The    status    of    the    course    modes    and    the approach  modes  are  annunciated  in  the  lower  center segment of the screen.  The exceptions to this are on the  turn  on  page  where  the  mode  is  not  annunciated and  on  the  Super  NAV  5  page  where  the  mode  is annunciated   on   the   left   side   of   the   screen.      The abbreviations used for mode annunciation are detailed in Table 3-14. Table 3-14.  Course Modes DISPLAY EXPLANATION APR – LEG Approach Active – Leg ARM – LEG Approach Arm – LEG ARM : 259 Approach Arm – OBS ENR – LEG En route  – Leg ENR: 274 En route  – OBS The approach active  – OBS mode is not a valid mode  and  cannot  be  selected.    For  the  OBS  modes, the    number    included    in    the    annunciation    is    the magnetic course selected by the pilot. (1)   Selecting  The  Mode.    The  mode  cannot be selected with the MOD pages because the external course mode selector/annunciator is used. (a)  Locate    the    external    course    mode selector/annunciator. (b)  Press  the  switch  and  it  will  change the modes and annunciate the mode selected. (2)   Leg  Mode.  The characteristics of the leg mode are as follows. (a)  The default Course Deviation Indicator  (CDI)  sensitivity  is  ±  5  nm,  full  scale.    This applies  to  the  CDI  on  the  NAV  1  page  as  well  as  the external  HSI.    If  the  HSI  has  five  dots  left  and  right  of the  center  position,  each  dot  represents  one  nautical mile of deviation. NOTE In some installations where the KLN 90B is interfaced     to     certain     models     of     EFIS equipment, the scale factor will be plus or minus 7.5 nm, full scale. (b)  Navigation is provided along the great circle   path   between   two   waypoints.      Great   circle navigation is the shortest distance between two points located on  the earth's surface.  In case of  DIRECT TO  operation, the FROM waypoint is not displayed but it is the point where   DIRECT  TO  operation  was  initiated.