TM 1-1510-218-10 3-51 NOTE If    another    attempt    at    the    approach    is desired  after  holding,  it  is  necessary  to manually    change    the    active    waypoint. When  the  FAF  and  the  missed  approach holding  point  are  the  same,  the  KLN  90B will change the active waypoint to the FAF when   the   change   from   OBS   to   LEG   is made.    Make  sure  to  make  this  change  as soon  as  possible  to  ensure  the  approach active mode becomes the active mode. at.   Radar Vectors.  1.   Select  the  approach  and  enter  it  into  the flight plan. 2.   When ATC initiates radar vectors, change the  active  waypoint  to  the  FAF  and  select OBS.      The   order   of   these   steps   is   not important.  It is just as effective to change to OBS  mode  and  then  change  the  active waypoint. 3.   Change the selected course on the HSI to the final approach course.  It is possible to maintain   the   aircraft   orientation   on   the Super NAV 5 page.  Refer to Figure 3-68. Figure 3-68.  Radar Vectors 4.   Once  established  on  the  inbound  course, change back to the LEG mode to allow for proper  approach  operation  and  automatic leg  sequencing.    For  best  performance, the change back to LEG mode should be made  before  the  aircraft  is  2  nm  from  the FAF. NOTE It  is  mandatory  that  the  unit  be in the LEG mode with the FAF as the active waypoint before   crossing   the   FAF   to   activate   the approach   active   mode   and   change   to   ± 0.3 nm  scale  factor.    The  CDI  scale  factor changes from ± 1.0 nm to ± 0.3 nm over the 2  miles  to  the  FAF.    Delaying  the  switch from  OBS  to  LEG  mode  compresses  the scale  factor  change.    This  will  make  the transition  more  abrupt.    If  the  switch  from OBS to LEG is delayed too long, it will not be  possible  for  the  KLN  90B  to  change  to the approach active mode. 5.   The   rest   of   the   approach   will   be   flown using the same steps presented previously. au.  On Airport Navaid Approach. 1.   Select  the  approach  and  enter  it  into  the flight plan. 2.   When    the    distance    from    the    present position to the destination airport reaches 30 nm, the KLN 90B will arm the approach mode.  The CDI scale factor will transition to ± 1.0 nm and the KLN 90B will provide more sensitive integrity monitoring.  Press the altitude button to update the altimeter setting. 3.   When the aircraft is 4 nm from the IAF, the KLN 90B will provide a reminder to select the    OBS    mode.        The    OBS    mode    is required   for   the   procedure   turn.      After passing    the    IAF,    select    the    outbound course on the HSI. 4.   The  aircraft  is  now  headed  outbound  for the procedure turn.  As soon as practical, change the active waypoint to the FAF. Pull out the right inner knob with the Super NAV     5     page     displayed.          Scan     the waypoints     until     the     FAF,     FFxx–f,     is displayed in the window and press the    D    button.    Refer  to  Figure  3–69.    Since  the course  to  the  FAF  is  already  defined  (in the   OBS   mode   with   the   HSI   set   to   the outbound course), press the   D   button a second    time    to    activate    this    waypoint instead of going directly to it. 5.   With the OBS mode selected and the FAF as the active waypoint, it is possible to fly the     procedure     turn.          Allow     enough