Honeywell KLN 900s Pilot's Manual page 115

4. Use the outer knob to move the cursor to the offset
field adjacent to the active waypoint identifier.
Entering an offset allows you to reach the desired
altitude a specified distance before reaching the way-
point. In this example you desire to reach traffic pat-
tern altitude two nautical miles prior to the airport,
which allows sufficient time to slow down and pre-
pare for the landing. Enter an offset of 2 nm (figure
5-25).
Notice that the bottom of the NAV 4 page now displays
an angle. If you wish to start your descent now using
the displayed descent angle, use the outer knob to posi-
tion the cursor over the ANGLE field (figure 5-26).
VNAV operation is initiated by bringing the cursor over
the ANGLE field. Or, by leaving the cursor off of the
ANGLE field, you may watch the VNAV angle increase
as you fly toward your 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. Just
start a rate of descent so that the aircraft's altimeter
matches the advisory altitude.
A better way yet to initiate VNAV is to program a desired
angle to use for the descent. If you are not sure what a
suitable descent angle is, use the CAL 4 page to calcu-
late one for you. The CAL 4 page is described in sec-
tion 5.3.4. After a little experience using the VNAV fea-
ture, you will soon learn what angles to use for your nor-
mal speeds and rates of descent. To program a
descent angle:
5. Use the outer knob to move the cursor to the
ANGLE field, and then enter the desired descent
angle (figure 5-27). If the time to begin your descent
is greater than ten minutes, VNV ARMED will now
be displayed on the top line of the NAV 4 page. If
the time is less than ten minutes, the top line dis-
plays a countdown to the time to begin the descent.
6. Return to any desired page for now. If you got to the
NAV 4 page by pressing A, press A once again
to return to the pages previously in view. If you got
to the NAV 4 page using the inner and outer knobs,
press C to turn off the cursor function and then
use the inner and outer knobs to select the desired
page. Approximately 90 seconds before the time to
begin descent, the message prompt will flash. When
you view the Message page, it will display "VNAV
ALERT". This is notification for you to view the NAV
4 page because it is getting close to the time to
begin your descent.
7. When the countdown reaches 0:00, the time will be
replaced with an advisory altitude (figure 5-28).
Begin your rate of descent so that the altitude dis-
played on your altimeter matches the advisory alti-
tude.
VNV ANGLE |VNV IN 8:53
GS:
FPM:
ANGLE
CAL 4 enr-leg
5-8
|VNV INACTV
|
|IND 07500ft
|SEL:01900ft
|KDBQ :-02nm
|ANGLE:-0.8^
CRSR
Figure 5-25
|VNV 7500ft
|
|IND 07500ft
|SEL:01900ft
|KDBQ :-02nm
|ANGLE:-0.8^
CRSR
Figure 5-26
|
160kt|IND 07500ft
0500|SEL:01900ft
1.8^|KDBQ :-02nm
|ANGLE:-1.8^
CRSR
Figure 5-27
|VNV 7500ft
|
|IND 07500ft
|SEL:01900ft
|KDBQ :-02nm
|ANGLE:-1.8^
NAV 4
Figure 5-28
Rev 2