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the cotter pins.
(6) Connect the electrical cables to the alternator. Refer to Chapter 92 for the wiring
diagrams.
(7) Connect the battery. Make sure that you connect
the positive lead first.
Refer to Section 24-31.
(8) Install the engine cowlings. Refer to Section 71-10.
(9) Do a function test of the alternator. Refer to Paragraph 6.
5. Remove/Install the Voltage Regulator
A. Remove the Voltage Regulator
Detail Steps/Work Items Key Items/References
(1) Set the ALT/BAT switch to OFF.
(2) Remove the engine cowlings. Refer to Section 71-10.
(3) Disconnect the battery. Make sure that you
disconnect the negative terminal first.
Refer to Section 24-31.
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Detail Steps/Work Items Key Items/References
Doc # 6.02.01
Rev. 5 24-30-00 Page 207
20 Sep 2007
(4) Disconnect the electrical connections to the
regulator.
At the in-line connector.
(5) Remove the 4 nuts and washers which attach the
voltage regulator to the mounting bracket.
Hold the regulator!
(6) Move the regulator clear of the airplane.
B. Install the Voltage Regulator
Detail Steps/Work Items Key Items/References
(1) Put the voltage regulator in position on the
mounting bracket.
(2) Install the 4 washers and nuts which attach the
regulator to the mounting bracket.
(3) Connect the electrical connections at the in-line
connector.
(4) Connect the battery. Make sure that you connect
the positive lead first.
Refer to Section 24-31.
(5) Install the engine cowlings. Refer to Section 71-10.
(6) Do a function test of the alternator. Refer to Paragraph 6.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 208
20 Sep 2007 24-30-00 Doc # 6.02.01
Rev. 5
6. Test the Alternator
Detail Steps/Work Items Key Items/References
(1) Set the ALT/BAT switch to ON. The alternator warning light (ALT or
ALTERNATOR) must come on. The
amperage and voltage graphic displays
in the integrated engine indicator must
flash.
(2) Start the engine. Refer to the DA 40 Airplane Flight
Manual.
(3) Set the engine speed to 1720 RPM. Until the
battery has charged and the load meter has
stabilized.
Monitor the integrated engine indicator.
The voltage must be 28 volts ± 2.5 %
(4) Set all the electrical loads to ON. The voltage must remain at 28 volts ±
2.5 % and the load meter should
indicate an increase in load.
(5) Operate intermittent loads throughout this part of
the test, for example, flaps, Pitot heat.
The voltage must remain at 28 volts ±
2.5 %. The load meter should indicate
the related loads.
(6) Shut-down the engine. Refer to the DA 40 Airplane Flight
Manual. The alternator warning light
(ALT or ALTERNATOR) must come
on.
(7) Set the ALT/BAT switch to OFF.
7. Adjust/Test the Voltage Regulator
The voltage regulator can be adjusted in service. Refer to the equipment manufacturers manuals for
data on adjusting the voltage of the voltage regulator.
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-31-00 Page 1
20 Sep 2007
Section 24-31
Battery System - Lycoming Engine
1. General
This Section tells you about the battery system for airplanes with the Lycoming engine installed. See
Sections 24-00 and 24-30 for the description and operation of the battery in the electrical generation
system.
The battery is located in the engine bay on the front of the fire-wall, on the right. When the alternator
voltage is greater than the battery voltage, the alternator charges the battery.
When the alternator is operating, the voltmeter shows the alternator voltage. When the alternator is
off-line, the voltmeter shows the battery voltage.
The battery supplies current to the main bus or, if installed, to the essential bus through the battery
relay. The battery relay is in the relay box which is located on the firewall, inboard of the battery. A 70
amps circuit-breaker protects the battery system.
Regular maintenance of the battery system is necessary. Do not wait until a starting problem occurs.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 2
20 Sep 2007 24-31-00 Doc # 6.02.01
Rev. 5
Battery Mounting Frame
Battery Cover
Battery
Battery Retaining Clamp
Nut
Washer
Battery Terminal
Battery Terminal
Firewall
Figure 1: Battery Installation
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-31-00 Page 101
20 Sep 2007
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