TM 1-1510-225-10 3D-17 VNV INACTV IND 09000FT SEL:04000FT KMKC :-00NM ANGLE:-0.0^o ALTITUDE BARO:30.09” ALERT: ON WARN:+300FT E N R   -   L E G CRSR CRSR Figure 3D-13.  Altitude Page and NAV 4 Page (1)   Altitude alerting allows the selection of a target  altitude  and  then  provides  a  visual  alarm  1000 feet   prior   to   reaching   the   selected   altitude,   another upon  reaching  the  altitude  and  another  for  deviation from the selected altitude. 1.     Press     the     altitude     button.          The altitude  page  will  be  displayed  on  the left  with  the  cursor  over  the  first  two digits     of     the barometric     altimeter setting.      The   NAV   4   page   will   be displayed  on  the  right  with  the  cursor over    the    first    digit    of    the    selected altitude field. 2.     Use   the   left   knobs   to   update   the altimeter setting if required.  There are three  cursor  positions.    Use  the  left outer knob to move the cursor and the left  inner  knob  to  change  the  digits.   With  the  proper  altimeter  setting,  the indicated  altitude  on  the  right  should be  the  same  as  the  aircraft’s  actual altimeter. NOTE There  may  be  some  difference  (less  than 100 feet) between the indicated altitude and the  aircraft’s  actual  altitude  if  the  altitude input  to  the  KLN  90B  is  from  an  altitude encoder    because    these    encoders    only provide altitude in 100 foot increments.  3.     Turn   the   left   outer   knob   one   step clockwise  to  position  the  cursor  over the  ALERT  field.    If  OFF  is  displayed, turn  the  left  inner  knob  to  select   ON.   When alerting is enabled, an arrow to the right of ON points to the selected altitude    on    then    right    side    of    the screen. 4.     Select an amount of warning by using the   left   outer   knob   to   position   the cursor over the WARN field and using the    left    inner    knob    to    select    the amount of warning.  It is selectable in 100-foot  increments  from  200  feet  to 900 feet. 5.     Enter the selected altitude one digit at a  time  in  the  SEL  field  of  the  NAV  4 page by using the right outer knob to position  the  cursor  over  the  desired digit    and    the    right    inner    knob    to change the digits. 6.     Press  altitude  to  return  to  the  pages previously displayed. CAUTION The   altitude-alerting   feature   will   only   be accurate if the barometric altimeter setting is kept updated. NOTE Due to the resolution of the altitude input, it   may   be   necessary   to   descend   slightly below  of  climb  slightly  above  the  selected altitude before the reaching altitude alert is activated.  This selected altitude alert must be     activated     to     arm     the     system     for providing the altitude deviation alert. 7.     The    altitude    alert    annunciator    will flash  three  times  1,000  feet  prior  to reaching   the   selected   altitude,   flash twice    upon    reaching    the    selected altitude,   and   flash   four   times   when deviating  above  or  below  the  selected altitude   by   more   than   the   warning selected.      Additionally,  the  altitude- alerting  feature  is  interfaced  with  the GPAAS in aircraft that do not have an altitude pre-selector.  The GPAAS  will announce   "Altitude,   Altitude"   in   the above    three    situations.        In    those aircraft   with   an   altitude   pre-selector, altitude   alerting   is   incorporated   with that system. (2)   The  KLN  90B  has  a  Vertical  Navigation (VNAV)  feature  that  allows  an  ascent  or  descent  path to    be    programmed    and    then    provides    advisory altitudes  to  fly  to  arrive  at  a  waypoint  at  a  specified altitude.    The  NAV  4  page  is  used  to  program  vertical navigation.   1.     Select the NAV 4 page on either side of  the  screen.    The  NAV  4  page  can be  selected  either  by  using  the  outer and  inner  knobs  or  by  pressing  the