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Trouble  Possible Cause  Repair 
There is 28 VDC on the main  Avionic master switch set to  Set the avionic master switch 
bus but not on the avionic bus.  OFF. AVIONIC BUS circuit-breaker not set. Avionics master relay defective. A failure of the cables which connect the main bus to the avionics bus.  to ON. Set the AVIONIC BUS circuit breaker. Repair/replace the avionics master relay. Do a continuity test of the cables. Refer to Chapter 92 for the wiring diagrams. Repair/replace defective cables. 
There is 28 VDC on the  Avionic master switch set to  Set the avionic master switch 
essential bus but not on the  OFF.  to ON. 
essential avionic bus.  ESSENTIAL AVIONIC circuit-breaker not set. Essential avionics relay defective. A failure of the cables which connect the essential bus to the essential avionic bus.  Set the ESSENTIAL AVIONIC circuit-breaker. Repair/replace the essential avionics relay. Do a continuity test of the cables. Refer to Chapter 92 for the wiring diagrams. Repair/replace defective cables. 

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Electrical Power
AMM

Maintenance Practices
1. General
This Section tells you how to remove/install components of the DC load distribution system. Refer to the component manufacturers manuals for more data and shop data.
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 40 SPARE PARTS APPROVED BY THE MANUFACTURER.
3. Remove/Install the Avionics Master Relay or Essential Avionics Relay
A. Remove the Avionics Master Relay or Essential Avionics Relay
Detail Steps/Work Items  Key Items/References 
(1)  Remove the top engine cowling.  Refer to Section 71-10. 
(2)  Disconnect the battery: S Disconnect the negative cable from the battery. S Disconnect the positive cable from the battery.  Refer to Section 24-31. 
(3)  Remove the instrument panel cover.  Refer to Section 25-10. 

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Detail Steps/Work Items  Key Items/References 
(4)  Disconnect the electrical cables from the relay. 
(5)  Remove the bolts which attaches the relay to the instrument panel floor. 
(6)  Move the relay clear of the airplane. 

B. Install the Avionic Master Relay
Detail Steps/Work Items  Key Items/References 
(1)  Put the relay in position on the instrument floor. 
(2)  Install the bolts which attach the relay to the instrument panel floor. 
(3)  Connect the cables to the relay.  Refer to Chapter 92 for the Wiring Diagrams. 
(4)  Install the instrument panel cover.  Refer to Section 25-10. 
(5)  Connect the battery.  Refer to Section 24-31. Connect the positive cable first. 
(6)  Install the top engine cowling.  Refer to Section 71-10. 
(7)  Do a test of the relay: S Set the ALT/BAT switch to ON. S Set the radio ON. S Set the AVIONICS MASTER switch to ON. S Set the AVIONICS MASTER switch to OFF. S Set the ALT/BAT switch to OFF.  All avionics must operate. 
　
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