BendixKing KLN 89B - Pilots Guide - Manual (Page 104)

In addition, there may be a NAV/GPS switch/annunciator to switch a
CDI or HSI indicator’s navigation source between the KLN 89(B) and
a VOR/ILS system, and a GPS APR switch/annunciator which allows
display and control of the KLN 89B approach modes (see section
5.1).
3.16 AVIONICS BUS VOLTAGE ALERTING
The SET 10 page serves as a monitor of your avionics power bus. It
gives you a digital readout of the voltage supplied to your avionics,
down to tenths of volts. You will find this feature valuable as an extra
layer of security in cases of electrical or charging system problems.
A voltage alert feature is also available on this page, to warn you of
an electrical system problem, regardless of whether you are viewing
the SET 10 page or not. It is set up so that the avionics bus voltage
must drop below the alert limit for a certain length of time. This time
delay is so that brief power interruptions don't trigger the voltage
alert.
The alert voltage and the alert delay are set at the time of installation
and stored in the KLN 89(B) configuration module. As the pilot, your
two options are to have the voltage alert disabled, or to have it
enabled with the predefined voltage and time delay values.
To enable the voltage alert feature:
1. Select the SET 10 page
(figure 3-198) and turn on the
cursor (
B
).
2. Turn the right inner knob to
enable the alert feature. The
alert voltage and alert delay will
be displayed on lines 2 and 3
(figure 3-199).
3. Turn off the cursor (
B
).
If the avionics bus voltage drops
below the alert voltage for the speci-
fied delay time, the message
*Low Bus Voltage
Check Charging System
will be displayed. This message may be indicative of a problem with
the aircraft's charging system. Consult your aircraft's Pilot Operating
KLN 89/KLN 89B Pilot’s Guide Basic GPS Operation
3-67
Basic GPS Operation
Chapter 3
APT VOR NDB INT USR ACT NAV FPL CAL SET OTH
åå.ånm| BUS MONITOR
ееееее|Bus Volt 27.4V
Leg|Alert Volt OFF
SET 10|
Figure 3-198
APT VOR NDB INT USR ACT NAV FPL CAL SET OTH
åå.ånm| BUS MONITOR
ееееее|Bus Volt 27.4V
Leg|Alert Volt 20.0V
*CRSR*|Alert Delay 15S
Figure 3-199