Beechcraft C-12C Operator And Technical Reference Manual page 174

TM 1-1510-218-10
2. Press
button to turn on the cursor
function if it is not already on.
3. Enter the desired altitude in the
SEL field.
4. Use the outer knob to move the
cursor to the offset field adjacent to
the
Entering an offset allows reaching
the desired altitude a specified
distance
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.
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.
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
programmed.
may be used to calculate a
descent angle.
descent angle:
a. Using the outer knob, move
b. Return to any desired page
3-20
the appropriate
active waypoint identifier.
before reaching
When the desired angle is
desired angle may
The CAL 4 page
To program a
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
now be displayed on the top
line of the NAV 4 page. If the
time is less than 10 minutes,
the top line displays
countdown to the time to
begin descent.
for now. If the NAV 4 page
was selected by pressing the
altitude button, press
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 desired page.
CRSR
the
VNAV VNAV on a flight plan is virtually identical. The
NAV 4 page will initially contain the identifier for the
active waypoint.
referencing this waypoint or any waypoint in the active
flight plan that is still in front of the aircraft's position.
When another valid waypoint in the flight plan is
entered on the NAV 4 page, the aircraft's lateral flight
path is not altered.
(5) NAV 5 Page. The NAV 5 page provides
be
a navigation graphics presentation. Refer to Figure
3-14.
1:KMDT
2:LRP
3:MXE
4:KPHL
5:
FPL 0
a
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
the
monitoring system, a heading up presentation may
also be selected.
Approximately
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.
c. When the countdown reaches
0:00, the time will be replaced
with an altitude
Begin the descent so that the
altitude displayed
altimeter matches the altitude
advisory.
VNAV may be programmed
4
123 o
ENR - LEG
Figure 3-14. NAV 5 Page
90 seconds
advisory.
on the
3
40
2
NAV 5