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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 24-33-00 Doc # 6.02.01
Rev. 5
3. Remove/Install the Alternator Excitation Battery
A. Remove the Alternator Excitation Battery
Detail Steps/Work Items Key Items/References
(1) Remove the engine cowlings. Refer to Section 71-11.
(2) Disconnect the airplane main 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.
(4) Disconnect the alternator excitation battery:
S Disconnect the negative cable from the
battery.
S Disconnect the positive cable from the
battery.
(5) Release the battery hold-down clamp.
(6) Remove the battery.
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-33-00 Page 203
20 Sep 2007
B. Install the Alternator Excitation Battery
Detail Steps/Work Items Key Items/References
(1) Put the battery in position on the instrument panel
shelf.
(2) Install the battery hold-down clamp.
(3) Connect the alternator excitation battery:
S Connect the positive cable to the battery.
S Connect the negative cable to the battery.
(4) Install the instrument panel cover. Refer to Section 25-10.
(5) Connect the airplane main battery:
S Connect the positive cable to the battery.
S Connect the negative cable to the battery.
(6) Install the engine cowlings. Refer to Section 71-11.
(7) Do an engine ground test. The alternator warning light must go
OFF.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 204
20 Sep 2007 24-33-00 Doc # 6.02.01
Rev. 5
4. Replace the Alternator Fuse
Detail Steps/Work Items Key Items/References
(1) Remove the engine cowlings. Refer to Section 71-11.
(2) Disconnect the airplane main battery:
S Disconnect the negative cable from the
battery.
S Disconnect the positive cable from the
battery.
(3) Remove the cover from the relay box.
(4) Release the 100 A alternator fuse. Dispose of the old fuse.
(5) Install a new 100 A fuse.
(6) Install the cover to the relay box.
(7) Do an engine ground test. The alternator warning light must go
OFF.
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-34-00 Page 1
20 Sep 2007
Section 24-34
Battery System - TAE 125 Diesel Engine
1. General
This Section tells you about the battery systems for airplanes with the TAE 125 Diesel engine
installed. See Sections 24-01 and 24-33 for the description and operation of the battery in the
electrical generation system.
The airplane has three batteries:
) A main battery located on the top front face of the engine firewall. This battery provides the usual
airplane electrical services.
) An ECU backup battery located below the rear passengers´ seat on the RH side. The ECU backup
battery connects directly to the ECU alternate power relay. This battery provides power to the ECU
if the all other power supplies fail.
) An alternator excitation battery located on the instrument panel shelf. It is a 12 V; 1.3 Ah battery.
It connects directly to the alternator field connection when the ENGINE MASTER switch is set to
ON. Refer to Section 24-33 for maintenance procedures for this battery.
2. Main Battery Description and Operation
The main battery is a 12 V, 35 Ah sealed battery. A tray on the top face of the firewall, near the center
holds the base of the battery. A strap holds the battery and cover in place. The positive and negative
cables attach to terminals at the top, front of the battery. The usual rubber caps protect the
connections.
When the alternator voltage is greater than the battery voltage, the alternator charges the battery.
When the alternator is operating, the digital voltmeter shows the alternator voltage. When the
alternator is off-line, the digital voltmeter shows the battery voltage.
The battery supplies current to the ECU bus through the battery relay. The battery relay is in the relay
junction box which is located on the firewall, adjacent to the battery. There is no circuit-protection.
The battery also supplies the hot battery bus. A 100 Ampère fuse protects the hot battery system.
　
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