Advisory Vnav Operation; Vnav For Direct To Operation - Honeywell KLN 900s Pilot's Manual

5.2 ADVISORY VNAV OPERATION

The KLN 900's vertical navigation feature (VNAV) allows
you to program a descent or ascent path, and then provides
you with an advisory altitude to fly that will provide guidance
along the vertical path. For example, you can program the
VNAV to provide descent guidance so that you arrive at
your active waypoint or a waypoint in the active flight plan at
an altitude that you specify. The KLN 900 will alert you of
when to start the descent, and display the advisory altitudes
to fly throughout the descent.

5.2.1 VNAV For Direct To Operation

The Navigation 4 (NAV 4) page is used to program the KLN
900 for vertical navigation. The following example will be
used to illustrate how to use the VNAV feature. You are
using the KLN 900 to fly direct to your destination airport,
Dubuque Municipal airport (KDBQ) located in Dubuque,
Iowa. You are presently about 65 nm West of Dubuque, fly-
ing at 7500 feet MSL (figure 5-21). You desire to use the
VNAV to provide vertical guidance to Dubuque's traffic pat-
tern altitude of 1900 feet MSL.
1. Select the NAV 4 page on either side of the screen (fig-
ure 5-22). You can select the NAV 4 page either by
using the knobs or by pressing A to bring up the NAV
4 page on the right side and the ALT page on the left.
The aircraft's actual altitude is displayed in the IND field.
If the displayed altitude is incorrect it is probably because
you have not recently updated the KLN 900's altimeter
baro setting on the ALT page (see section 3.15).
NOTE: There may be some difference (less than 100 feet)
between the indicated altitude (IND) and the aircraft's actual
altitude if the altitude input to the KLN 900 is from an altitude
encoder because these encoders only provide altitude in
100 foot increments. When DC Altimeters are used, display
increments of 200 feet are possible.
The identifier for the active waypoint (KDBQ) is automati-
cally displayed on the NAV 4 page. Prior to programming a
VNAV operation, the top of the page displays that the VNAV
is inactive (VNV INACTV).
2. Press the appropriate C button to turn on the cursor
function if it is not already on (figure 5-23).
3. Enter the desired altitude of 1900 feet in the SEL field.
The outer knob is used to move the cursor and the inner
knob is used to select the digits. The altitude may be
entered in 100 foot or 10 meter increments
(figure 5-24).
NOTE: If the KLN 900 does not have an altitude input, the
IND and SEL fields will be labeled FR (from) and TO
respectively. The aircraft's present altitude must be entered
into the FR field and the desired altitude into the TO field.
DIS 64.8nm
GS
NAV 1 enr-leg
$=KDBQ |VNV INACTV
+++++Â+++++|
DIS 64.8nm|IND 07500ft
GS
ETE
BRG
NAV 1 enr-leg
5-7
$=KDBQ
ETE
145kt BRG 094^
NAV 1
Figure 5-21
145kt|SEL:00000ft
:27|KDBQ :-00nm
094^|ANGLE:-0.8^
NAV 4
Figure 5-22
|VNV INACTV
|
|IND 07500ft
|SEL:00000ft
|KDBQ :-00nm
|ANGLE:-0.8^
CRSR
Figure 5-23
|VNV INACTV
|
|IND 07500ft
|SEL:01900ft
|KDBQ :-00nm
|ANGLE:-0.8^
CRSR
Figure 5-24
:27
Rev 2