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) To-From indicator. This shows the direction to the VOR station along the selected radial.
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 4
20 Sep 2007 34-28-00 Doc # 6.02.01
Rev. 5
SLAVE
- +
CCW
FREE
CW
Slave and Free
Gyro Switch
Slaveing Meter
Clockwise/Counterclockwise
Adjustment
GS N GS
6
3
33
30
E
12
15
W
24
21
S
NAV HDG
Compass
Warning Flag
Lubber
Line
NAV Warning
Flag
Heading
Select
Bug
Dual
Glideslope
Pointers
Symbolic
Aircraft
VOR and LOC
Select Bar
Course
Select Knob
Heading
Select
Knob
Glideslope
Deviation
Scale
To/From
Indicator
Course
Select
Pointer
VOR/LOC
Deviation Scale
Compass
Card
Figure 1: Bendix/King KA 51B Slaving Control Unit
Figure 2: Bendix/King KI 525A Horizontal Situation Indicator
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-28-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have with the compass system. Refer to Section 34-52 for
trouble-shooting the localizer (LOC) and glideslope (GS) functions of the HSI.
If you have the trouble detailed in the Trouble column read across to the Possible Cause column. Then
do the repair given in the Repair column.
Trouble Possible Cause Repair
Gyro compass does not
operate.
Circuit breaker not set.
Indicator defective.
Cables/connectors defective.
Set the circuit breaker.
Replace the indicator.
Do a test for continuity on each
cable. Do a test for short circuit
to ground and between cables.
Replace defective cables.
HSI heading flag appears
during normal operation (or
stays in view after start-up).
The gyro on the KG 102A is
running at less than 50 % of
the usual speed.
The power supply in the KG
102A is defective.
Do a test for the correct voltage
at the KG 102A. If the input
voltage is correct, replace the
KG 102A.
Replace the KG 102A.
Continuous large deflection of
the slaving meter. System
operates correctly in free
mode.
Slaving system failed. Replace the magnetic azimuth
transmitter KMT 112. If this
does not clear the fault, do a
test for continuity on each
cable between the KMT 112
and the KG 102A. Do a test for
short circuit to ground and
between cables. Replace
defective cables.
AIRCRAFT
Navigation
DA 40 Series
AMM
Trouble Possible Cause Repair
Page 102
20 Sep 2007 34-28-00 Doc # 6.02.01
Rev. 5
Large differences between the
magnetic compass and the
gyro compass.
Slaving system failed. Replace the magnetic azimuth
transmitter KMT 112. If this
does not clear the fault, do a
test for continuity on each
cable between the KMT 112
and the KG 102A. Do a test for
short circuit to ground and
between cables. Replace
defective cables.
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-28-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
This Section tells you how to remove/install the components of the compass system. It also tells you
how to adjust the compass system.
2. Remove/Install the Slaved Directional Gyro
A. Remove the Slaved Directional Gyro
Detail Steps/Work Items Key Items/References
(1) Remove the passenger's seat. Refer to Section 25-10.
(2) Release the connector from the gyro.
(3) Remove the screws that attach the gyro to the
mounting plate.
Release the bonding cable from the
gyro.
(4) Remove the gyro from the airplane.
B. Install the Slaved Directional Gyro
Detail Steps/Work Items Key Items/References
(1) Put the gyro in position on the mounting plate.
(2) Install the screws that attach the gyro to the
mounting plate.
Attach the bonding cable to one of the
screws.
(3) Attach the connector to the gyro.
(4) Install the passenger's seat. Refer to Section 25-10.
(5) Do a functional test of the gyro compass system
in free and slaved mode.
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 202
20 Sep 2007 34-28-00 Doc # 6.02.01
Rev. 5
3. Remove/Install the Slaving Control Unit
A. Remove the Slaving Control Unit
Detail Steps/Work Items Key Items/References
(1) Remove the instrument panel cover. Refer to Section 25-10.
　
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