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The GFRP tray which holds the 28 alkaline batteries is mounted under the instrument panel, on the
% co-pilot's side. If the lithium manganese batteries are used, the package is mounted behind 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 24-32-00 Doc # 6.02.01
Rev. 5
% Figure 1: Emergency Battery Tray (Alkaline batteries installed)
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-32-00 Page 3
20 Sep 2007
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% Figure 2: Emergency Power Package Installation (Lithium Manganese Batteries installed)
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 4
20 Sep 2007 24-32-00 Doc # 6.02.01
Rev. 5
% Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-32-00 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 42
volts.
Batteries expired.
Batteries have been used.
One or more batteries installed
incorrectly.
Emergency battery system
wiring defective.
Replace batteries.
Replace batteries.
Ensure correct polarity of each
battery.
Repair the emergency battery
system wiring.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 102
20 Sep 2007 24-32-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-32-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
This Section tells you how to replace batteries in the emergency battery pack. It also tells you how to
test the emergency battery system.
Refer to Chapter 92 for the wiring diagrams.
% 2. Remove/Install the Batteries in the Emergency Battery Pack (Alkaline Batteries installed)
% A. Remove the Batteries in the Emergency Battery Pack (Alkaline Batteries installed)
Detail Steps/Work Items Key Items/References
(1) Disconnect the electrical plug on the right side of
the battery tray.
(2) Remove the screw on the right side of the battery
tray.
Hold the battery tray.
(3) Remove the battery tray clear of the airplane.
(4) Open the battery tray.
(5) Remove the batteries.
CAUTION: THE BATTERIES CANNOT BE RE-CHARGED. DO NOT TRY TO RECHARGE
THE BATTERIES. IF YOU TRY TO RE-CHARGE THE
BATTERIES, THEY CAN EXPLODE OR LEAK.
CAUTION: DISPOSE OF THE BATTERIES PROPERLY (ASK YOUR BATTERY
DEALER FOR ADVISE). BATTERIES CONTAIN POISONS WHICH
HARM THE ENVIRONMENT. DO NOT THROW THE USED BATTERIES
INTO THE GARBAGE. DO NOT EXPOSE BATTERIES TO FIRE. DO
NOT DISMANTLE BATTERIES.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 202
20 Sep 2007 24-32-00 Doc # 6.02.01
Rev. 5
% B. Install the Batteries in the Emergency Battery Pack (Alkaline Batteries installed)
CAUTION: USE ONLY NEW BATTERIES. REFER TO THE EQUIPMENT LIST IN
THE AIRPLANE FLIGHT MANUAL, SECTION 6.5, FOR THE CORRECT
BATTERY TYPE.
CAUTION: DO NOT SHORT-CIRCUIT THE BATTERIES. ENSURE CORRECT
POLARITY OF ALL BATTERIES.
Detail Steps/Work Items Key Items/References
(1) Place new batteries in the battery tray. Ensure correct polarity. Apply Dow
Corning compound (DC4) to both poles
of each battery.
(2) Close the battery tray.
(3) Measure the voltage of the battery pack. On the connector for the electrical plug.
If the voltage is less than 42 volts, then
the batteries are used, or at least one
battery was installed incorrectly. Use
new batteries and ensure correct
polarity of each battery.
(4) Put the battery tray in place under the instrument
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