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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 12 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 71-11.
(2) Disconnect the battery:
S Disconnect the negative cable from the
battery.
S Disconnect the positive cable from the
battery.
(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 24-61-00 Doc # 6.02.01
Rev. 5
(4) Disconnect the electrical cables from the relay.
(5) Remove the bolts which attach the relay to the
instrument panel floor.
(6) Move the relay clear of the airplane.
% B. Install the Avionics Master Relay or Essential Avionics 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 24-34. Connect the
positive cable first.
(6) Install the top engine cowling. Refer to Section 71-11.
(7) Do a test of the relay:
S Set the ELECTRIC MASTER key switch to
ON.
S Set the AVIONICS MASTER switch to ON.
S Set the COM 2 radio ON, if installed.
(Avionics master relay only).
S Set the COM 1 radio to ON. (Essential
avionics relay only).
S Set the AVIONIC MASTER switch to OFF.
S Set the ELECTRIC MASTER key switch to
OFF.
The radio must operate.
The radio must operate.
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-61-00 Page 203
20 Sep 2007
4. Remove/Install a Circuit-Breaker
A. Remove a Circuit-Breaker
Detail Steps/Work Items Key Items/References
(1) Remove the top engine cowling. Refer to Section 71-11.
(2) Disconnect the main battery:
S Disconnect the negative cable from the
battery.
S Disconnect the positive cable from the
battery.
Refer to Section 24-34.
(3) Disconnect the ECU backup battery:
S Disconnect the negative cable from the
battery.
S Disconnect the positive cable from the
battery.
Refer to Section 24-34.
(4) Remove the instrument panel cover. Refer to Section 25-10.
(5) Remove the nuts and washers which attach the
circuit-breakers to the instrument panel.
Do this for all circuit-breakers attached
to the same bus bar.
(5) Remove the screw which connects the circuitbreaker
to the copper bus bar.
(7) Disconnect the wires from the circuit-breaker.
(8) Shift back the copper bus bar together with the
remaining circuit-breakers.
(9) Remove the circuit-breaker from the instrument
panel.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 204
20 Sep 2007 24-61-00 Doc # 6.02.01
Rev. 5
B. Install a Circuit-Breaker
Detail Steps/Work Items Key Items/References
(1) Put the circuit-breaker in position in the
instrument panel.
(2) Move the copper bus bar forward together with
the remaining circuit-breakers.
(3) Connect the wires to the circuit breaker. Refer to Chapter 92 for the Wiring
Diagrams.
(4) Install the screw which attaches the circuitbreaker
to the copper bus bar.
(5) Install the nuts and washers which attach the
circuit-breakers to the instrument panel.
(6) Install the instrument panel cover. Refer to Section 25-10.
(7) Connect the main battery. Refer to Section 24-34. Connect the
positive cable first.
　
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