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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.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 202
20 Sep 2007 24-41-00 Doc # 6.02.01
Rev. 5
3. Remove/Install the External Power Relay
A. Remove the External Power Relay
Detail Steps/Work Items Key Items/References
(1) Remove the engine cowlings. 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 cover from the relay junction box.
(4) Disconnect the electrical cables from the external
power relay.
(5) Remove the nut and washers which attach the
bus bar to the external power relay.
(6) Remove the 2 bolts which attach the external
power relay to the relay box.
(7) Move the relay clear of the airplane.
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-41-00 Page 203
20 Sep 2007
B. Install the External Power Relay
Detail Steps/Work Items Key Items/References
(1) Put the relay in position in the relay junction box.
(2) Install the 2 attaching bolts.
(3) Install the washers and nut that attach the bus
bar to the relay.
(4) Connect the power and control cables to the
external power relay.
Refer to Chapter 92 for the wiring
diagrams.
(5) Install the cover to the relay box.
(6) Connect the positive cable to the battery. Apply Dow Corning compound (DC4)
to the battery terminal and the cable
lug.
(7) Connect the negative cable to the battery. Apply Dow Corning compound (DC4)
to the battery terminal and the cable
lug.
(8) Install the engine cowlings. Refer to Section 71-11.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 204
20 Sep 2007 24-41-00 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 1
20 Sep 2007
Section 24-60
DC Electrical Load Distribution - Lycoming Engine
1. General
This Section tells you about the system which supplies DC electrical power for other systems for
airplanes with the Lycoming engine installed. The DC electrical load distribution system has these
components:
) Main bus.
) Avionic bus.
) Essential bus (optional).
) Essential avionic bus (only when the electrical system has an essential bus).
) Battery bus.
) Hot bus.
) Battery relay.
) Avionic master relay.
) Essential avionics relay (only when the electrical system has an essential bus).
) Switches.
) Circuit-breakers.
Refer to Section 24-30 for the DC generation system.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 2
20 Sep 2007 24-60-00 Doc # 6.02.01
Rev. 5
VOLTAGE REGULATOR MAIN BUS
ANNUN. AVIONIC BUS
ALT. PROT.
ALT. CONT.
ALT.
ALT
ALTERNATOR CURRENT SENSOR
START
START
BATT
BATT
BATT
EXTERNAL POWER
BATTERY
24 V
11 AMP HRS
STARTER
160 A
ALTERNATOR
28 V / 70 A
OVERVOLTAGE
PROTECTION
AVIONIC
BUS
MASTER CONTROL
AVIONIC
Figure 1: DC Electrical Load Distribution without Essential Bus (simplified)
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-60-00 Page 3
20 Sep 2007
2. Description
A. Main Bus and Essential Bus
(1) Electrical System without Essential Bus
The alternator supplies the main bus through the alternator circuit-breaker. The battery supplies
the main bus through the battery relay and the battery circuit-breaker. The battery supplies a
positive voltage to the coil of the battery relay. The ALT/BAT switch connects the other side of
　
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