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Trouble-Shooting
1. General
The table below lists the defects you could have with the battery system. If you have the trouble
detailed in the Trouble column read across to the Possible Cause column. Then do the repair given
in the Repair column.
Trouble Possible Cause Repair
Battery voltage low. Battery electrolyte level low.
Battery capacity low.
Alternator output low.
Fill to correct level.
Do a capacity test. If
necessary, replace the battery.
Trouble-Shoot the alternator,
refer to Section 24-30.
Battery will not connect to the
main bus or essential bus.
Battery circuit-breaker open.
Battery circuit-breaker
defective.
Battery relay defective.
ALT/BAT switch defective.
Battery system wiring
defective.
Close the circuit-breaker.
Replace the circuit-breaker.
Refer to Section 24-60.
Replace the battery relay.
Replace the ALT/BAT switch.
Do a test of the battery system
wiring. Refer to Chapter 92 for
the wiring diagrams.
Load meter shows zero at all
times.
Defective ammeter indicator.
Defective ammeter transducer.
Refer to the VM1000
integrated engine indicator
manual.
Replace the transducer.
Voltmeter shows zero at all
times.
Defective voltmeter.
Defective wiring in the
voltmeter system.
Refer to the VM1000
integrated engine indicator
manual.
Do a test of the wiring. Refer to
Chapter 92 for the wiring
diagrams.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 102
20 Sep 2007 24-31-00 Doc # 6.02.01
Rev. 5
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AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-31-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
Keep the battery clean. Remove grease and other contaminants from the battery case. Remove dirt
from the area of the terminals. Protect the terminals and cable lugs with Dow Corning compound 4
(DC4).
If you do not use the airplane regularly you must remove the battery for charging.
CAUTION: INSTALL ONLY A BATTERY WHICH IS APPROVED BY THE AIRPLANE
MANUFACTURER.
2. Safety Precautions
Wear protective clothing when you work on the battery (rubber apron, rubber gloves and goggles).
If you get acid on you, apply a solution of sodium bicarbonate and water to the area. Then flush with
large quantities of water. Get medical attention as soon as possible.
If you get acid in or near your eyes, flush with large quantities of water and an eye-wash solution. Get
medical attention immediately.
Obey the maintenance instructions of the battery manufacturer.
Always disconnect the battery when you do work on the electrical system. Disconnect the negative
cable first. Connect the negative cable last.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 202
20 Sep 2007 24-31-00 Doc # 6.02.01
Rev. 5
3. Remove/Install the Battery
A. Remove the Battery from the Airplane
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.
(4) Disconnect the vent hose from the battery.
(5) Remove the battery retaining clamp:
S Remove the 2 nuts and washers from clamp.
S Lift the clamp clear of the retaining studs.
(6) Remove the battery from the airplane.
B. Install the Battery in the Airplane
Detail Steps/Work Items Key Items/References
(1) Make sure that the battery is clean and dry.
(2) Move the battery into position in the battery
mount.
(3) Install the battery retaining clamp:
S Put the battery retaining clamp into position
over the retaining studs and on the battery.
S Install the 2 washers and nuts onto the
retaining studs.
Make sure that the clamp is seated
correctly.
Tighten the nuts down evenly.
(4) Tighten the 2 retaining nuts. Torque 1.6 Nm (1.18 ft.lb)
(5) Connect the vent hose to the battery.
CAUTION: MAKE SURE THAT YOU CONNECT THE CABLES TO THE
CORRECT TERMINALS. INCORRECT CONNECTION CAN DAMAGE
THE ELECTRICAL AND AVIONIC SYSTEMS.
(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 71-10.
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-31-00 Page 203
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