3A-10 Information Manual
Section 3A Cirrus Design
Abnormal Procedures SR22
ALT 1 Light Steady
Steady illumination indicates a failure of ALT 1. Attempt to bring
alternator back on line. If alternator cannot be brought back, reduce
loads and use Main Bus or Non-Essential loads only as necessary for
flight conditions.
1. ALT 1 Master Switch ................................................................OFF
2. Alternator 1 Circuit Breaker............................ CHECK and RESET
3. ALT 1 Master Switch ................................................................. ON
If alternator does not reset:
4. Switch off unnecessary equipment on Main Bus 1, Main Bus 2,
and the Non-Essential Buses to reduce loads. Monitor voltage.
5. ALT 1 Master Switch ................................................................OFF
6. Land as soon as practical.
ALT 1 Light Flashing
Serials 0002 thru 1643 and 1645 thru 1666: The most likely cause is a
severely discharged battery along with heavy equipment loads. In this
event, reduce loads on Main and Non-Essential buses and monitor
amperage until charging rate is within normal limits. Then loads can be
added as required.
1. Ammeter Switch..................................................................... BATT
2. If charging rate is greater than 30 amps, reduce load on Main Bus
1, Main Bus 2, and Non-Essential buses.
3. Monitor ammeter until battery charge rate is less than 15 amps.
4. When battery charge rate is within limits, add loads as necessary
for flight conditions.
ALT 2 Light Steady
Except during low RPM operations, steady illumination indicates a
failure of ALT 2. If alternator cannot be brought back, Essential bus
loads will be powered from ALT 1, BAT 1, and BAT 2.
• Note •
ALT 2 light will illuminate steady and ALT 2 will not come on
line until 1700 - 2200 RPM.
1. ALT 2 Master Switch ................................................................OFF
March 2010
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