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Ensure correct polarity of each
battery.
Repair the emergency battery
system wiring.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 102
20 Sep 2007 24-35-00 Doc # 6.02.01
Rev. 5
% Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-35-00 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
% A. Remove the Batteries in the Emergency Battery Pack
% 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 RE%
CHARGE 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 24-35-00 Doc # 6.02.01
Rev. 5
% B. Install the Batteries
% 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 21 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
% panel on the co-pilot's side.
Engage the appropriate bolt in the
groove on the left side of the tray.
(5) Install the screw on the right side of the battery
% tray.
%
% (6) Connect the electrical plug on the right side of the
% battery tray.
Ensure correct polarity.
% (7) Remove the instrument panel cover. Refer to Section 25-10.
% (8) Measure the voltage on the back side of the
% EMERGENCY switch.
If the voltage is below 21 volts, it is
probable that the wiring is defective.
% Repair wiring.
% (9) Install the instrument panel cover. Refer to Section 25-10.
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-40-00 Page 1
20 Sep 2007
Section 24-40
External Power - Lycoming Engine
1. General
The DA 40 has an external power socket located on the right side of the fuselage, near the battery.
It is a standard 28 Volt DC power socket. When you connect external power to the external power
socket, the external power control relay is energized and the external power comes on-line.
2. Description and Operation
Figure 1 shows a simple schematic diagram of the external power system. The external power system
has these components:
A. 28 Volt Socket
The 28 VDC power socket is located on the right side of the fuselage, near the airplane battery.
The socket has 3 pins:
) A large negative pin.
) A large positive pin.
) A small positive pin.
A diode connected between the small positive pin and the external power relay solenoid protects
the system from reverse polarity.
B. External Power Relay
The external power relay is located in the relay box mounted on the firewall. Heavy duty cable
connects the large positive pin to the input terminal of the relay. Another heavy duty cable
connects the large negative pin to a ground point.
The small positive pin connects to the solenoid of the external power relay via the diode.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 2
20 Sep 2007 24-40-00 Doc # 6.02.01
Rev. 5
RL3
EPU Relay
D4
D5
RL4
　
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