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unlikely that a flashing ALT 2 light could occur, even with a very low
BAT 2.
The Power Distribution Schematic shows the electrical system power
distribution. Individual loads on each circuit breaker panel bus are
shown in the same order as they are on the panel. Note that items on
the circuit breaker panel Essential buses are powered from ALT 1, ALT
2, BAT 1, and BAT 2. The circuit breaker panel Main buses and Non-
Essential buses are powered from ALT 1 and BAT 1 only.
• Note •
If it is necessary to reduce electrical loads due to an alternator
malfunction, switch off electrical components and/or systems
that are not essential for the current flight conditions rather
than pulling circuit breakers. Load shedding in this manner will
prevent accidental circuit breaker disconnection and loss of
power to flight-critical systems. See Figure Electrical Power
Distribution, for details on electrical busses and what
components/systems they power.
March 2010
3A-10 Information Manual
Section 3A Cirrus Design
Abnormal Procedures SR20
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 1005 thru 1581: 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
Information Manual 3A-11
Cirrus Design Section 3A
SR20 Abnormal Procedures
2. Alternator 2 Circuit Breaker ........................... CHECK and RESET
3. ALT 2 Master Switch ..................................................................ON
If alternator does not reset:
4. Switch off unnecessary equipment on Main Bus 1, Main Bus 2,
and Non-Essential Buses to reduce loads.
5. ALT 2 Master Switch ................................................................OFF
6. Land as soon as practical.
Engine Indicating System Failure
Serials 1582 and Subsequent: In the event of an Data Acquisition Unit
(DAU) failure, the engine indications displayed on the MFD and PFD
will be disabled. Numeric readouts will display as three white dashes,
the CHT and EGT bar graphs will be removed, and indicator needles
displayed on the simulated gages will be removed.
In the event of DAU failure, pull and reset the ANNUN / ENGINE INST
circuit breaker. If the engine indicating system fails to resest, land as
soon as practical.
1. ANNUN / ENGINE INST Circuit Breaker ...............................Cycle
2. Land as soon as practical.
LOW VOLTS Warning Light Illuminated
Illumination of the LOW VOLTS light indicates that the voltage
measured at the Essential Bus is 24.5 volts or less. Typically, this
indicates that the airplane is operating on battery power only and both
alternators have failed or are off. If both alternators have failed:
1. Land as soon as practical.
March 2010
3A-12 Information Manual
Section 3A Cirrus Design
Abnormal Procedures SR20
Communications Failure
Communications failure can occur for a variety of reasons. If, after
　
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