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to the relay box.
(9) Move the relay clear of the airplane.
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Electrical Power DA 40 Series
AMM
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20 Sep 2007 24-34-00 Doc # 6.02.01
Rev. 5
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 washer and nut to the bus bar
connection.
(5) Install the cover to the relay box.
(6) Connect the cables to the main battery:
S Connect the positive cable to the battery.
S Connect the negative cable to the battery.
Apply Dow Corning compound (DC4)
to the battery terminal and the cable
lug.
(7) Connect the cables to the ECU backup battery:
S Connect the positive cable to the battery.
S Connect the negative cable to the battery.
Apply Dow Corning compound (DC4)
to the battery terminal and the cable
lug.
(8) Install the rear passengers' seat. Refer to Section 25-10.
(9) Install the engine cowlings. Refer to Section 71-11.
(10) Do a test for correct operation of the battery
relay.
Refer to Paragraph 6.
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-34-00 Page 207
20 Sep 2007
6. Battery Relay Functional Test
Do this test in an area where the engine can be run.
Detail Steps/Work Items Key Items/References
(1) Set the ELECTRIC MASTER key switch to ON.
(2) Set the ENGINE MASTER switch to ON. The voltmeter must indicate the 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.
(4) Set the ENGINE MASTER switch to OFF.
(5) Set the ELECTRIC MASTER key switch to OFF.
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Electrical Power DA 40 Series
AMM
Page 208
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Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-35-00 Page 1
20 Sep 2007
% Section 24-35
% Emergency Battery System - TAE Engine
% 1. General
% This Section tells you about the emergency battery system for airplanes with the TAE 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 volts, size 'AA' (also known as
% 'Mignon'). Refer to the Equipment List in Section 6.5 of the Airplane Flight Manual for the approved
% battery type.
% The GFRP tray which holds the 28 batteries is mounted under the instrument panel, on the co-pilot's
% side.
% When all other sources of electrical power fail during flight, the EMERGENCY switch on the left side
% of the instrument panel is set to ON to use the emergency battery. It supplies the attitude gyro
% (horizon) and the flood light with power for at least 1 hour and 30 minutes.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 2
20 Sep 2007 24-35-00 Doc # 6.02.01
Rev. 5
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% Figure 1: Emergency Battery Tray
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-35-00 Page 101
20 Sep 2007
% Trouble-Shooting
%
% 1. General
% The table below lists the defects you could have with the emergency 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
% Batteries leaking. Batteries expired. Replace batteries. Clean all
% items that are contaminated.
% Voltage on the back side of the
% emergency switch less than 21
% volts.
Batteries expired.
% Batteries have been used.
% One or more batteries installed
% incorrectly.
% Emergency battery system
% wiring defective.
Replace batteries.
Replace batteries.
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