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20 Sep 2007
4. Fill the Battery with Distilled Water
Remove the battery from the airplane before you fill it with distilled water.
WARNING: WEAR PROTECTIVE GOGGLES, RUBBER GLOVES AND RUBBER
APRON WHEN WORKING ON THE BATTERY. THE BATTERY
CONTAINS DILUTE SULPHURIC ACID THAT CAN INJURE PERSONS
AND DAMAGE EQUIPMENT.
A. Procedure
Detail Steps/Work Items Key Items/References
(1) Clean the outer surface of the battery with warm
water. Wipe the battery dry
(2) Remove the caps from the cells.
(3) Add water to the level marked on the battery. Use only clean distilled water.
(4) Replace the caps.
5. Disconnect/Connect the Battery for Maintenance
A. Disconnect the Battery for Maintenance
Detail Steps/Work Items Key Items/References
(1) Remove the engine cowlings. Refer to Section 71-10.
(2) Disconnect the negative cable from the battery.
(3) Disconnect the positive cable from the battery.
B. Connect the Battery after Maintenance
Detail Steps/Work Items Key Items/References
CAUTION: MAKE SURE THAT YOU CONNECT THE CABLES TO THE
CORRECT TERMINALS. INCORRECT CONNECTION CAN DAMAGE
THE ELECTRICAL AND AVIONIC SYSTEMS.
(1) Connect the positive cable to the battery. Apply Dow Corning compound (DC4) to
the battery terminal and the cable lug.
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(2) Connect the negative cable to the battery. Apply Dow Corning compound (DC4) to
the battery terminal and the cable lug.
(3) Install the engine cowlings. Refer to Section 71-10.
6. Remove/Install the Battery Relay
A. Remove the Battery Relay
Detail Steps/Work Items Key Items/References
(1) Remove the engine cowlings. 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.
(3) Remove the cover from the relay box.
(4) Disconnect the electrical cables from the battery
relay.
(5) Remove the 2 bolts which attach the battery
relay to the relay box.
(6) Move the relay clear of the airplane.
B. Install the Battery Relay
Detail Steps/Work Items Key Items/References
(1) Put the relay in position in the relay box.
(2) Install the 2 attaching bolts.
(3) Connect the power and control cables to the
battery relay.
Refer to Chapter 92 for the wiring
diagrams.
(4) Install the cover to the relay box.
(5) Connect the positive cable to the battery. Apply Dow Corning compound (DC4) to
the battery terminal and the cable lug.
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Detail Steps/Work Items Key Items/References
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20 Sep 2007
(6) Connect the negative cable to the battery. Apply Dow Corning compound (DC4) to
the battery terminal and the cable lug.
(7) Install the engine cowlings. Refer to Section 71-10.
(8) Do a test for correct operation of the battery
relay.
Refer to Paragraph 7.
7. Battery Relay Functional Test
Do this test in an area where the engine can be run.
Detail Steps/Work Items Key Items/References
(1) Make sure that the ALT/BAT switch is set to OFF. There must be no indication on the
voltmeter.
(2) Set the ALT/BAT switch to ON. The voltmeter must indicate battery
voltage.
WARNING: MAKE SURE THAT THE AREA OF THE PROPELLER IS CLEAR
BEFORE YOU OPERATE THE STARTER MOTOR. PROPELLERS
CAN CAUSE INJURY OR DEATH.
(3) Operate the starter motor. You do not have to start the engine.
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AMM
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Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Electrical Power
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20 Sep 2007
Section 24-32
Emergency Battery System - Lycoming Engine
1. General
This Section tells you about the emergency battery system for airplanes with the Lycoming engine
installed. The emergency battery system is only installed in the IFR model. Regular maintenance of
the emergency battery system is necessary.
Refer to Chapter 92 for the wiring diagrams.
2. Description
The emergency battery system consists of:
) An emergency battery pack.
) A sealed EMERGENCY switch.
The emergency battery pack consists of 28 alkaline dry batteries, 1.5 volt, size 'AA' (also known as
% 'Mignon') or of 12 lithium manganese batteries, 3 volt, 1300 mAh. Refer to the Equipment List in
Section 6.5 of the Airplane Flight Manual for the approved battery type.
　
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