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AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-60-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
Make sure that the alternator is supplying power and that there is 28 VDC on the Main Bus. Refer to
Section 24-30. For faults on a piece of equipment, or a system, refer to the applicable Chapter. For
example, for no oil pressure indication, see Chapter 77 Engine Indicating. The table below lists the
defects you could have with the DC load distribution 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
There is 28 VDC on the main
bus but not on the avionic bus.
Avionic master switch set to
OFF.
AVIONIC BUS circuit-breaker
not set.
Avionics master relay
defective.
A failure of the cables which
connect the main bus to the
avionics bus.
Set the avionic master switch
to ON.
Set the AVIONIC BUS circuit
breaker.
Repair/replace the avionics
master relay.
Do a continuity test of the
cables. Refer to Chapter 92 for
the wiring diagrams.
Repair/replace defective
cables.
There is 28 VDC on the
essential bus but not on the
essential avionic bus.
Avionic master switch set to
OFF.
ESSENTIAL AVIONIC circuitbreaker
not set.
Essential avionics relay
defective.
A failure of the cables which
connect the essential bus to
the essential avionic bus.
Set the avionic master switch
to ON.
Set the ESSENTIAL AVIONIC
circuit-breaker.
Repair/replace the essential
avionics relay.
Do a continuity test of the
cables. Refer to Chapter 92 for
the wiring diagrams.
Repair/replace defective
cables.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 102
20 Sep 2007 24-60-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-60-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
This Section tells you how to remove/install components of the DC load distribution system. Refer to
the component manufacturers manuals for more data and shop data.
2. Electrical Safety
The DA 40 has a low voltage DC electrical system. When correctly maintained it is safe to work on.
The battery can supply heavy current through low resistance circuits (for example, if you ground the
positive output with a wrench by accident).
Always follow the usual safety practices for working on electrical equipment. Allow only qualified
persons to maintain the electrical system.
CAUTION: DISCONNECT THE BATTERY BEFORE DOING MAINTENANCE ON
THE ELECTRICAL SYSTEM. MAKE SURE THAT YOU DISCONNECT
THE NEGATIVE LEAD FIRST.
CAUTION: AFTER DOING ELECTRICAL MAINTENANCE ALWAYS DO A
CONFIDENCE TEST OF THE SYSTEM WITH A 24 VOLT POWER
SUPPLY THAT HAS OVER-CURRENT PROTECTION. DO THIS
BEFORE CONNECTING THE BATTERY
CAUTION: USE ONLY DA 40 SPARE PARTS APPROVED BY THE
MANUFACTURER.
3. Remove/Install the Avionics Master Relay or Essential Avionics Relay
A. Remove the Avionics Master Relay or Essential Avionics Relay
Detail Steps/Work Items Key Items/References
(1) Remove the top engine cowling. Refer to Section 71-10.
(2) Disconnect the battery:
S Disconnect the negative cable from the
battery.
S Disconnect the positive cable from the
battery.
Refer to Section 24-31.
(3) Remove the instrument panel cover. Refer to Section 25-10.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Detail Steps/Work Items Key Items/References
Page 202
20 Sep 2007 24-60-00 Doc # 6.02.01
Rev. 5
(4) Disconnect the electrical cables from the relay.
(5) Remove the bolts which attaches the relay to the
instrument panel floor.
(6) Move the relay clear of the airplane.
B. Install the Avionic Master Relay
Detail Steps/Work Items Key Items/References
(1) Put the relay in position on the instrument floor.
(2) Install the bolts which attach the relay to the
instrument panel floor.
(3) Connect the cables to the relay. Refer to Chapter 92 for the Wiring
Diagrams.
(4) Install the instrument panel cover. Refer to Section 25-10.
(5) Connect the battery. Refer to Section 24-31. Connect the
positive cable first.
(6) Install the top engine cowling. Refer to Section 71-10.
(7) Do a test of the relay:
S Set the ALT/BAT switch to ON.
S Set the radio ON.
S Set the AVIONICS MASTER switch to ON.
　
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