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alternator operates the ALTERNATOR caution message.
) ECU A An amber caution light shows when the ECU A fails. The engine control system
changes to the ECU B automatically.
) ECU B An amber caution light shows when the ECU B fails.
) FUEL TRANS
A white status light shows when the fuel transfer pump is ON.
) PITOT An amber caution light shows that the Pitot heating system is OFF. The caution
light receives an electrical current from the heater side of the Pitot heat relay. The
Pitot heating caution message shows when the Pitot heating is not switched ON,
or when there is a failure of the Pitot heating system.
Prolonged operation of the Pitot heating on the ground can also cause the Pitot
heating caution message to show. This happens when the thermal switch
operates. (The switch prevents overheating of the Pitot heating system on the
ground). This is a normal function of the system. After a cooling period, the heating
system will come on again automatically.
) LOW FUEL An amber caution light shows low fuel level is less than 3 US gal (+2/-1 US gal) in
the left fuel tank. The fuel level switch in the left fuel tank operates the low fuel
caution message.
AIRCRAFT
Indicating Systems DA 40 Series
AMM
Page 4
20 Sep 2007 31-51-00 Doc # 6.02.01
Rev. 5
) TRIM FAIL This light is only used when the autopilot system is installed.
Red warning light indicating a failure of the automatic trim system of the autopilot.
The autopilot control unit activates the trim fail warning message when there is a
failure of the automatic trim system of the autopilot.
) GLOW A status message shows when the glow relay is energized. This is usually only
before or during start.
3. Functional Check
The functional check is automatically started after switching the ELECTRIC MASTER key switch ON.
All lights are flashed, and the aural alert is muted. By pressing the 'acknowledge' button, the lights are
extinguished, and a short aural alert is sounded. This test verifies functionality of the microprocessor,
the lights, and the aural signal.
You may do additional system tests by holding the 'acknowledge' button for 2 seconds. All lights will
begin flashing, and the aural alert will sound continuously.
4. Wiring Diagrams
Refer to Chapter 92 for the wiring diagram for the central warning system.
AIRCRAFT
DA 40 Series
AMM
Indicating Systems
Doc # 6.02.01
Rev. 5 31-51-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have with the Central Warning System. 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
Warning/Caution/Status
indication incorrect.
Sensor defective. Replace the sensor.
Annunciator panel defective. Replace the annunciator panel.
High resistance or open
connection in the electrical
wiring from the sensor.
Do resistance and continuity
tests between the indicator and
the sensor. Repair the
defective connection or wire.
AIRCRAFT
Indicating Systems DA 40 Series
AMM
Page 102
20 Sep 2007 31-51-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Indicating Systems
Doc # 6.02.01
Rev. 5 31-51-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
This Section tells you how to replace the main components of the central warning system. Refer to the
equipment manufacturer's manuals for more data on the annunciator panel. Refer to the related
Chapter for data on the warning sensors.
Refer to Chapter 92 for the Wiring Diagrams.
2. Remove/Install the Annunciator Panel
A. Remove the Annunciator Panel
Detail Steps/Work Items Key Items/References
(1) Remove the instrument panel cover. Refer to Section 25-10.
(2) Disconnect the electrical connector from the
annunciator panel.
(3) Remove the 4 cross-head screws which attach
the annunciator panel to the instrument panel.
Hold the annunciator panel.
(4) Move the annunciator panel out of the instrument
panel and lift it clear of the airplane.
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Indicating Systems DA 40 Series
AMM
Page 202
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Rev. 5
B. Install the Annunciator Panel
Detail Steps/Work Items Key Items/References
(1) Move the annunciator panel into its position in the
instrument panel.
(2) Install the 4 cross-head screws which attach the
annunciator panel to the instrument panel.
(3) Connect the electrical connector to the rear of the
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