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and illuminates the warning light when the voltage is less than
approximately 24.5 volts.
• Note •
The LOW VOLTS warning light may come on during extended
low RPM operation with heavy electrical loads. Under these
conditions, the light will go out at higher RPM.
ALT Fail Caution Lights
Two ALT Fail caution lights are installed in the annunciator panel. The
ALT 1 and ALT 2 caution lights in the annunciator panel provide
annunciation of alternator failure or overcurrent conditions at the
respective alternator. The lights are operated by circuits in the MCU
and current sensors on the ALT 1 and ALT 2 output lines. Steady
illumination of either light indicates an alternator failure. Serials 0002
through 1601, 1603 through 1643 and 1645 through 1662: A flashing
ALT light indicates an overcurrent condition.
Revision A7
7-72 P/N 13772-001
Section 7 Cirrus Design
Airplane Description SR22
Circuit Breakers and Fuses
Individual electrical circuits connected to the Main, Essential, and
Non-Essential Buses in the airplane are protected by re-settable circuit
breakers mounted in the circuit breaker panel on the left side of the
center console.
Essential Buses
The circuit breaker panel Essential Bus is powered by ALT 2 from the
MCU Essential Distribution Bus through the 25-amp ESSENTIAL
POWER circuit breaker and from BAT 2 through the 30-amp BATTERY
2 circuit breaker. The Essential Bus is also powered by ALT 1 and BAT-
1 through an isolation diode connecting the Main and Essential
Distribution Buses in the MCU. The autopilot and Essential avionics
equipment are powered directly from the Essential Distribution Bus in
the MCU through a 25-amp circuit breaker on the Distribution Bus.
Power from the 15-amp AVIONICS circuit breaker is also controlled
through the AVIONICS master switch on the bolster switch panel.
Main Buses
The circuit breaker panel Main Bus 1 and Main Bus 2 are powered by
ALT 1 and BAT 1 from the MCU Main Distribution Bus through 25-amp
circuit breakers on the Distribution Bus. ALT 2 and BAT 2 are
prevented from powering the Main Buses by the isolation diode
interconnecting the MCU distribution buses. Loads on circuit breaker
panel Main Buses are shed by pulling the individual circuit breakers.
The 15-amp AVIONICS circuit breaker on Main Bus 1 powers all loads
on the Non-Essential Avionics Bus. Power from the 15-amp AVIONICS
circuit breaker is also controlled through the AVIONICS master switch
on the bolster switch panel.
Non-Essential Buses
The circuit breaker panel contains two Non-Essential Buses, the Non-
Essential Equipment Bus and the Avionics Non-Essential Bus. The
Avionics Non-Essential Bus is powered through the 15-amp
AVIONICS circuit breaker on Main Bus 1 and is discussed above. The
Non-Essential Equipment Bus is powered by ALT 1 and BAT 1 from
the MCU Main Distribution Bus through a 25-amp circuit breaker. ALT
2 and BAT 2 are prevented from powering the Non-Essential
Equipment Bus by the isolation diode interconnecting the MCU
Revision A9
P/N 13772-001 7-73
Cirrus Design Section 7
SR22 Airplane Description
distribution buses. Loads on the Non-Essential Equipment Bus are
shed by pulling the individual circuit breakers.
Ground Service Receptacle
A ground service receptacle is located just aft of the cowl on the left
side of the airplane. This receptacle is installed to permit the use of an
external power source for cold weather starting and maintenance
procedures requiring reliable power for an extended period. The
external power source must be regulated to 28 VDC. The external
power control contactor is wired through the BAT 1 MASTER switch so
that the BAT 1 switch must be 'on' to apply external power.
Refer to Section 8, Ground Handling, Servicing, and Maintenance, for
use of external power and special precautions to be followed.
Convenience Outlet
A 12-volt convenience outlet is installed in the center console. The
receptacle accepts a standard cigarette-lighter plug. The outlet may be
used to power portable entertainment equipment such as CD players,
cassette players, and portable radios. Amperage draw through the
outlet must not exceed 3.5 amps. Power for the convenience outlet is
supplied through the 5-amp 12VDC OUTLET circuit breaker on the
Non-Essential Bus.
Revision A7
7-74 P/N 13772-001
Section 7 Cirrus Design
Airplane Description SR22
Exterior Lighting
The airplane is equipped with standard wing tip navigation lights with
integral anti-collision strobe lights. The separately controlled landing
light is located in the lower cowl.
　
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