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flow from the alternator to the main bus both graphically and digitally. The graphic display has color
range marks for quick visual reference of load levels. If the current flow is less than 2 amps, the
graphic display will flash and the red alternator warning light (ALT or ALTERNATOR) will come on
in the annunciator panel.
When the alternator is operating, the voltmeter shows the alternator voltage. When the alternator
is off-line, the voltmeter shows the battery voltage. The voltage is displayed both graphically and
digitally. The graphic display has colored range marks for quick visual reference of voltage levels.
If the voltage level is outside of the normal operating range the graphic display will flash. If the
voltage falls below 24 volts, the amber low voltage caution light (VOLT or LOW VOLTS) will come
on in the annunciator panel. The caution light will go out when the voltage exceeds 25 volts.
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Electrical Power DA 40 Series
AMM
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DA 40 Series
AMM
Electrical Power
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Trouble-Shooting
1. General
The table below lists the defects you could have with the DC generation 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
Alternator warning light (ALT
or ALTERNATOR) shows in
the annunciator panel and the
voltage/load meters in the
engine integrated display flash
with the engine running.
Alternator control circuitbeaker
not set.
Alternator circuit-breaker not
set.
Alternator flexible drive belt
loose/broken.
Voltage regulator defective.
Alternator defective.
Set the alternator control
circuit-breaker.
Set the alternator circuitbreaker.
Adjust/replace the flexible drive
belt. Refer to the maintenance
practices in this Section.
Test/replace the voltage
regulator. Refer to Chapter 92
for the wiring diagrams
Test/replace the alternator.
Refer to Chapter 92 for the
wiring diagrams
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Electrical Power DA 40 Series
AMM
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DA 40 Series
AMM
Electrical Power
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Maintenance Practices
1. General
This Section gives you the data to remove/install and adjust the components of the DC electrical
generation system on the airplane. 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.
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Electrical Power DA 40 Series
AMM
Page 202
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Rev. 5
Adjusting Bracket
Adjusting Bracket
Washer
Washer
Washer
Washer
Adjusting Bolt
Alternator Mounting
Alternator Mounting
Washers
Washers
Attaching Bracket
Attaching Bracket
Castellated Nut
Castellated Nut
Cotter Pin
Washer
Link Bracket
Main Mounting
Bolt
Main Mounting
Bolt
Washer
Adjusting Bracket
Attachment Bolt
Figure 4: Alternator Installation
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DA 40 Series
AMM
Electrical Power
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3. Adjust the Alternator Flexible Drive Belt
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.
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