TM 1-1510-225-10 3D-41 h.  Changing  the  CDI  Scale  Factor.    The  CDI scale factor can be changed by using either the MOD 1 or MOD 2 pages.  In normal operation, it is possible to  select  a  CDI  scale  factor  that  is   ±  5 nm,  1 nm, or 0.3 nm full-scale defection. NOTE The   KLN   90B   will   automatically   select   a scale  factor  while  in  one  of  the  approach modes.    When  the  KLN  90B  selects  a  CDI scale  factor,  it  is  not  possible  to  select  a scale factor that is less sensitive. 1.   Select either the MOD 1 or MOD 2 page. 2.   Press the left CRSR button.  If necessary, use the left outer knob to move the cursor over the value of the CDI scale. 3.   Rotate   the   left   inner   knob   to   select   the desired scale factor. 4.   Turn the left cursor function off. 3D-21.  APPROACH OPERATIONS. a.     Non-Precision Approach Operations.    The message/waypoint  annunciator,  is  the  primary  navaid selector to select which navigation source is displayed on    the    pilot's    EHSI,    the    course    mode    selector/ annunciator, to select the LEG or OBS modes, and the approach    mode    selector/annunciator,    to    arm    and annunciate the approach modes, must be operational. CAUTION The KLN 90B obtains approach information from the database. It is extremely important that the database is current.  The KLN 90B is approved for IFR non-precision approaches   only   when   the   database   is current.    If  an  approach  is  selected  when the  database  is  out  of  date,  a  status  line message, OUTDATED DATABASE will display in the bottom center of the screen. (1)   The    Super    NAV    5    page    has    been specifically  designed  to  provide  most  of  the  functions needed   for   non-precision   approaches.      This   page provides an interface that presents pertinent navigation information, a way to access the flight plan, and   a   graphic   presentation   of   the   present   position relative to the flight plan waypoints. NOTE There  are  some  approach  procedures  that are not suited for the operational characteristics   of   the   KLN   90B.      These procedures are not included in the database.        Ensure    that    the    KLN    90B contains   anticipated   procedures    for    the flight. (2)   In  addition  to  the  LEG  and  OBS  course modes,  there  are  also  two  approach  modes.    These are approach arm and approach active.  The status of the  approach  mode  is  indicated  both  on  the  external switch/annunciator    and    on    the    status    line    of   the KLN-90B.  The external annunciator will indicate ARM for  the  approach  arm  mode  and  approach  active  will be    annunciated    by    ACTV.        The    main    difference between these modes from the normal en route mode is that the integrity monitoring is set to a tighter level.   Another  difference  between  these  modes  and  the  en route modes is the CDI scale factor will usually change to   ±   1.0   nm   for   ARM   and   will   always   change   to ± 0.3 nm when in the APR ACTV mode. (3)   The  ARM  mode  can  be  selected  in  two ways.      The   normal   way   is   that   this   mode   will   be selected   automatically   by   the   KLN   90B   when   the aircraft is within 30 nm of the destination airport and an approach  for  that  airport  has  been  loaded  in  the  flight plan.    It  is  possible  to  arm  the  approach  mode  at  a distance   greater   than   30   nm   from   the   airport   by pressing the   GPS  APR  switch,  but  the  KLN  90B  will not   change   the   CDI   scale   factor   until   the   aircraft reaches  the  30-nm  point.    If  the   GPS  APR  external switch  is  pressed  while  the  approach  mode  is  armed, the  KLN  90B  will  disarm  the  approach  and  change back to en route mode.  The CDI scale factor will also change   back   to   ±   5.0   nm.      The   approach   can   be rearmed   by   simply   pressing   the   GPS   APR   switch again. (4)   The    APR    ACTV    mode    can    only    be engaged automatically by the KLN 90B.  To cancel the APR   ACTV   mode,   press   the   external    GPS    APR switch.      This   will   change   the   mode   to   APR   ARM.   Once past the FAF, it is not possible to return to the approach  active  mode  without  conducting  a  missed approach and flying back to the FAF. b.  General     Procedures     for     Non-Precision Approaches.     Non-precision  approaches  will  all  have the same general flow.  Refer to Figure 3D-56.