M Bus 2 Caution; Batt 1 Caution - Cirrus SR22 Pilot Operating Handbook

S 3A: A
ECTION BNORMAL
E S
LECTRICAL YSTEM

M BUS 2 Caution

Low Voltage on Main Bus 2
1. Perform ALT 1 Caution (Failure)
lists.
Main Bus 2 Voltage is low, indicative of dual Alt 1 and 2 failures
and will typically be associated with low M1 and M2 voltages, Alt
1 and Alt 2 current indications, Battery 1 discharge, ALT 1 & 2 and
M BUS 1 Caution

BATT 1 Caution

Unexpected discharge on battery 1.
1. Main Bus 1, 2 and Non-Essential Bus Loads.............................. REDUCE
2. Main Bus 1, 2 and Essential Bus Voltages................................MONITOR
3. Land as soon as practicable.
Battery 1 discharge while Alt 1 is functioning normally, indicative
of an internal power distribution failure within the MCU.
3A-12
P
ROCEDURES
M BUS 2
Procedure Complete
• N
OTE
& M BUS 2 Caution
Warning
BATT 1
Procedure Complete
• N
OTE
and ALT 2 Caution (Failure)
•
messages, and
message.
•
C D
IRRUS ESIGN
SR22
Check-
ESS BUS
P/N 13772-006
Reissue A