) Voltage regulator. Refer to Chapter 92 for the wiring diagrams. When the ALT/BAT switch is set to ON, an earth is supplied to the battery relay circuit which
closes the battery relay and supplies battery voltage to the main bus or, if installed, to the essential bus. The ALT/BAT switch also connects the main bus to pin 1 of the voltage regulator. The alternator comes on line.
The voltage regulator controls and protects the alternator. It also gives signals for the low voltage warning system, alternator out warning system and voltage sensing.
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2 3 4 5 6 7 8 9101112131415161718192021222324252627
RPM / 100
Figure 3: Alternator Performance Graph
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D. Alternator Indication
These components make the alternator indicating system:
) Alternator load indicator (Integral with the integrated engine instrument).
) Alternator voltage indicator (Integral with the integrated engine instrument).
) Alternator out warning.
) Low voltage warning.
The alternator load indicator is integral with the integrated engine instrument. It shows the current 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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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  Alternator control circuit- Set the alternator control 
or ALTERNATOR) shows in  beaker not set.  circuit-breaker. 
the annunciator panel and the  Alternator circuit-breaker not  Set the alternator circuit-
voltage/load meters in the  set.  breaker. 
engine integrated display flash 
with the engine running.  Alternator flexible drive belt loose/broken. Voltage regulator defective. Alternator defective.  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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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.
　
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