Revision A1 - Cirrus SR20 Pilot Operating Handbook

Section 3
Emergency Procedures
High Voltage on Main Bus 2
M BUS 2 Warning
1. Main Bus 1 Voltage (M1).................................................... CHECK
If M Bus 1 Voltage is greater than 32 volts
2. Perform M Bus 1 Warning Checklist
3. Main Bus 2 Voltage (M2).................................................... CHECK
If M Bus 2 Voltage is greater than 32 Volts:
4. ALT 2 Master Switch ........................................................... CYCLE
5. Main Bus 2 Voltage (M2).................................................... CHECK
If M Bus 2 Voltage remains greater than 32 volts
6. ALT 2 Master Switch ................................................................OFF
7. Perform ALT 2 Caution (Failure)
Amplification
Main Bus 2 Voltage is excessive. Indicates an alternator voltage
regulator failure; will typically be associated with abnormally high bus
voltage indications on M2 and ESS, may also be associated with M
BUS 1 and ESS BUS Warning Messages.
3-24
M BUS 2
Checklist (do not reset alternator)
Cirrus Design
SR20
P/N 21399-004

Revision A1