Doc # 6.02.01 Page 201
Rev. 4 09 Jan 2003

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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 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 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 42 volts, it is probable that the wiring is defective. Repair wiring. 
(9)  Install the instrument panel cover.  Refer to Section 25-10. 

Page 202 Doc # 6.02.01 09 Jan 2003 Rev. 4
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Electrical Power
AMM

% Section 24-33
% DC Generation - TAE 125 Diesel Engine
% 1. General
% The DC generation system for the DA 40 with the TAE 125 Diesel engine has these components:
%) Alternator.
%) Alternator current sensor.
%) Alternator fuse.
%) Voltage regulator (integral with the alternator).
%) Alternator excitation battery.
% This Section gives you only the simplified description, trouble-shooting and maintenance practices
% for the generating system. Refer to Section 24-01 for the full system description and operation.

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% Figure 1: Electrical Generation System Simplified Schematic Diagram %

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INSTRUMENT PANEL

ENGINE COMPARTMENT

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AMM

% 2. Description and Operation
% Figure 1 shows the generation system simplified schematic diagram. % A. Alternator
% The alternator is supplied as part of the engine. It is a14 VDC machine with a maximum output % of 90 A. It attaches to the rear left of the engine. A multi-V flat belt turns the alternator. An % automatic system adjusts the belt tension.
% The alternator has an integral voltage regulator. % There is no approved maintenance possible on the alternator. % B. Alternator Excitation Battery
% The alternator excitation battery is a sealed unit. It is located on the instrument panel shelf on the % left. A strap holds the battery in position.
% The battery power to energize the alternator field during start-up. The alternator then becomes % self-sustaining. The field voltage is sufficient to charge the excitation battery. If the field voltage % fails, the excitation battery provides sufficient power to maintain the alternator output for % emergencies. The ENGINE MASTER switch controls the circuit to the alternator field connection.
% C. Alternator Current Sensor
% An alternator current sensor is located inside the relay junction box. % D. Alternator Fuse
　
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