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2. Electrical Safety
The DA 40 has a low voltage DC electrical system. When correctly maintained it is safe to work on. The battery can supply heavy current through low resistance circuits (for example, if you ground the positive output with a wrench by accident).
Always follow the usual safety practices for working on electrical equipment. Allow only qualified persons to maintain the electrical system.
CAUTION:  DISCONNECT THE BATTERY BEFORE DOING MAINTENANCE ON THE ELECTRICAL SYSTEM. MAKE SURE THAT YOU DISCONNECT THE NEGATIVE LEAD FIRST. 
CAUTION:  AFTER DOING ELECTRICAL MAINTENANCE ALWAYS DO A CONFIDENCE TEST OF THE SYSTEM WITH A 24 VOLT POWER SUPPLY THAT HAS OVER-CURRENT PROTECTION. DO THIS BEFORE CONNECTING THE BATTERY 
CAUTION:  USE ONLY DA MANUFACTURER.  40  SPARE  PARTS  APPROVED  BY  THE 

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AIRCRAFT AMM
Adjusting Bracket
Washer
Adjusting Bracket Attachment Bolt Main Mounting Bolt
Adjusting Bracket  Washer 
Washer 
Washer  Link Bracket 
Adjusting Bolt  Castellated Nut  Alternator Mounting 
Washers 
Washer Castellated Nut  Attaching Bracket 
Alternator Mounting  Cotter Pin 
Washer 
Main Mounting Bolt  WashersAttaching Bracket 

Figure 4: Alternator Installation
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Electrical Power
AMM

3. Adjust the Alternator Flexible Drive Belt
DA 40 Series

Detail Steps/Work Items  Key Items/References 
(1)  Remove the engine cowlings.  Refer to Section 71-10. 
(2)  Disconnect the battery. Make sure that you disconnect the negative terminal first.  Refer to Section 24-31. 
(3)  Loosen the main mounting bolts: S Remove the cotter pins from the nuts. S loosen the mounting bolts.  Refer to Figure 4. 
(4)  Loosen the adjusting bolt: S Cut the lock-wire. S Loosen the bolt. 
(5)  Loosen the adjusting bracket attachment bolt: S Cut the lock-wire. S Loosen the bolt. 
(6)  Move the alternator towards the engine and lift the flexible belt clear of the alternator pulley. 
(7)  Examine the flexible belt. Look specially for: S Wear or damage to the belt. S Stretching of the belt. 
(8)  Install the flexible belt: S Move the alternator up and towards the engine. S Put the flexible drive belt into position over the alternator pulley and the drive pulley. S Move the alternator down and away from the engine until the flexible belt tension is correct. S Then tighten the adjusting bolt and the adjusting bracket attachment bolt. S Lock the bolt heads to the adjusting bracket with lock-wire  Make sure that the flexible belt is correctly seated in the Vee groove. Belt movement = 5 mm (0.2 in.) with 3 kp (6.5 lbf.) load applied. 

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AMM

Detail Steps/Work Items  Key Items/References 
(9)  Tighten the 2 alternator mounting bolts and install the cotter pins. 
(10)  Connect the battery. Make sure that you connect the positive lead first.  Refer to Section 24-31. 
(11)  Install the engine cowlings.  Refer to Section 71-10. 
(12)  Do a function test of the alternator.  Refer to Paragraph 6. 

4. Remove/Install the Alternator
A. Remove the Alternator
Detail Steps/Work Items  Key Items/References 
(1)  Remove the engine cowlings.  Refer to Section 71-10. 
(2)  Disconnect the battery. Make sure that you disconnect the negative terminal first.  Refer to Section 24-31. 
　
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