S
ECTION
3: E
MERGENCY
P
ROCEDURES
C
IRRUS
D
ESIGN
E
LECTRICAL
S
YSTEM
E
MERGENCIES
SR20
3-26
P/N 11934-005
Electrical System Emergencies
M BUS 1 Warning
M BUS 1
High Voltage on Main Bus 1
1. ALT 1 Switch....................................................................................... CYCLE
2. M Bus 1 Voltage (M1) ......................................................................CHECK
◆
If M Bus 1 Voltage is greater than 32 volts:
a. ALT 1 Switch ......................................................................................OFF
Checklist (do not reset alternator).
Procedure Complete
• N
OTE
•
Main Bus 1 Voltage is excessive, indicates an alternator 1 voltage
regulator failure; will typically be associated with abnormally high
voltage indications on M1, M2 and ESS buses, may also be associ-
ated with
or
message.
Reissue A