altitude button to bring up the NAV 4
page on the right and the Altitude
page on the right.
automatically displayed on the NAV 4 page. Prior to
programming a VNAV operation, the top of the page
displays VNV INACTV.
2. Press the appropriate CRSR button
to turn on the cursor function if it is not
3. Enter the desired altitude in the SEL
4. Using the outer knob, move the
cursor to the offset field adjacent to
Entering an offset allows reaching the
desired altitude a specified distance
before reaching the waypoint.
Notice that the bottom of the NAV 4 page now
displays an angle. To start the descent now using the
displayed descent angle, use the outer knob to
position the cursor over the ANGLE field. VNAV
operation is initiated by bringing the cursor over the
ANGLE field. By leaving the cursor off of the ANGLE
field, the angle will increase as flight is continued
toward the waypoint. When the desired angle is
reached, position the cursor over the ANGLE field and
VNAV will commence. When VNAV begins, the top of
the page displays an advisory altitude.
5. A desired angle may be programmed.
The CAL 4 page may be used to
program a descent angle:
a. Using the outer knob, move the
cursor to the ANGLE field and
enter the desired descent angle. If
the time to begin the descent is
greater than 10 minutes, VNV
ARMED will be displayed on the
top line of the NAV 4 page. If the
time is less than 10 minutes, the
top line displays a countdown to
the time to begin descent.
b. Return to any desired page for
now. If the NAV 4 page was
selected by pressing the altitude
button, press the altitude button
once again to return to the pages
previously in view. If the NAV 4
page was selected by using the
outer and inner knobs, insure the
cursor function is off and use the
outer and inner knobs to select the
90-seconds before the time to
begin the descent, the message
prompt will flash. The message
page will display VNAV ALERT.
This is notification to view the NAV
4 page because it is getting close
to the time to begin the descent.
0:00, the time will be replaced with
an altitude advisory. Begin the
displayed on the altimeter matches
the altitude advisory.
VNAV on a flight plan is virtually identical. The
NAV 4 page will initially contain the identifier for the
active waypoint. VNAV may be programmed
referencing this waypoint or any waypoint in the active
flight plan that is still in front of the aircrafts position.
When another valid waypoint in the flight plan is
entered on the NAV 4 page, the aircrafts lateral flight
path is not altered.
e. NAV 5 Page. The NAV 5 page provides a
navigation graphics presentation. Refer to Figure
E N R - L E G
Figure 3D-14. NAV 5 Page
(1) In all KLN 90B installations, there are
three common map orientations that may be selected
on the NAV 5 page: a true north up display, a desired
track up display, or an actual track up display. In
addition, if the KLN 90B is interfaced with the engine
trend monitoring system, a heading up presentation
may also be selected.