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3-56
Rev 1
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 until the entire selected
altitude is displayed (figure 3-180).
Only the selected altitude field (SEL) and the indicated alti-
tude (IND) of the NAV 4 page are used for altitude alerting.
The rest of the NAV 4 page is used for vertical navigation
which is described in chapter 5.
6. Press A to return to the pages previously being dis-
played.
7. The aural alarm activates as follows:
• 1000 feet prior to reaching the selected altitude -
three short tones
• Upon reaching the selected altitude - two short
tones
• Deviating above or below the selected altitude by
more than the warn altitude - four short tones.
NOTE: Due to the resolution of the altitude input, it may be
necessary to descend slightly below or climb slightly above
the selected altitude before the two tones are activated
indicating that the selected altitude has been reached. This
selected altitude alert must be activated to arm the system
for providing the altitude deviation alert.
The KLN 90B can provide the aural alarm tones in either of
two ways: it may be connected to an audio input of an
audio amplifier contained in an audio panel so that the
aural alarm is heard through the aircraft’s speaker and
headphones. Or the KLN 90B may be interfaced with an
external tone generator installed in the aircraft.
In order to use altitude alerting, the KLN 90B must have an
altitude input. If the altitude input is from an altitude
encoder or from an air data computer not having a baro
altitude output, then it will be necessary for you to manually
input the proper altimeter setting in order to get accurate
alerting. Remember, the altitude coming from an encoder
is pressure altitude and must be corrected with the proper
altimeter setting to convert to actual altitude. This altimeter
setting is easily accomplished by entering the altimeter
baro setting on the Altitude page. Press A to display the
Altitude page. Use the left knobs to make the altimeter
baro setting. Press A again to return to the pages previ-
ously being displayed. It’s so easy you have no excuses
for not keeping the baro setting updated!
CAUTION: The altitude alerting feature will only be
accurate if the altimeter baro correction is kept
updated. If altitude alerting is used, it is a good idea to
update the altimeter baro set on the ALT page each
time you make a change to the aircraft’s altimeter set-
ting.
ALTITUDE |VNV INACTV
|
BARO:30.09"|IND 09000ft
ALERT: ON =|SEL:04000ft
WARN:±300ft|KMKC :-00nm
|ANGLE:-0.0^
CRSR enr-leg CRSR
Figure 3-180