Cirrus Design Section 3
SR20 Emergency Procedures
P/N 21399-004 3-25P/N 21399-004 3-25
High or Low Voltage on Essential Bus
ESS BUS Warning
1. Essential Bus Voltage (ESS).............................................. CHECK
If Essential Bus Voltage is greater than 32 volts:
2. Main Bus 1 and Main Bus 2 Voltages (M1 and M2)........... CHECK
3. Perform appropriate M BUS 1 Warning or M BUS 2 Warning
checklists.
If Essential Bus Voltage is less than 24.5 volts:
4. Perform ALT 1 Caution (Failure) and ALT 2 Caution (Failure)
Checklists
If unable to restore at least one alternator:
5. Non-Essential Loads........................................................REDUCE
a. If flight conditions permit, consider shedding:
Air Conditioning, Landing Light, Pitot Heat, Cabin Fan, Nav
Lights, Strobe Lights, Audio Panel, COM 2.
6. Land as soon as practical (Battery reserve only)
Amplification
• Caution •
Dependent on battery state, flaps and landing light may be
unavailable on landing.
Essential Bus voltage is high or low. High voltage indicates alternator
voltage regulator failure; will typically be associated with high M1 and/
or M2 voltages and M BUS 1 and/or M BUS 2 warning messages.
Low voltage indicates dual failures of Alternators 1 and 2, will typically
be associated with low M1 and M2 voltages, M BUS 1 and M BUS 2
Caution messages, and Alt 1 and Alt 2 Caution messages.
ESS BUS
Revision A1
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