C
IRRUS
D
ESIGN
S
ECTION
3: E
MERGENCY
P
ROCEDURES
SR20
E
LECTRICAL
S
YSTEM
E
MERGENCIES
P/N 11934-005
3-27
M BUS 2 Warning
M BUS 2
High Voltage on Main Bus 2
1. Main Bus 1 Voltage (M1)................................................................. CHECK
◆
If M Bus 1 Voltage is greater than 32 volts:
a. Perform
2. Main Bus 2 Voltage (M2)................................................................. CHECK
◆
If M Bus 2 Voltage is greater than 32 volts:
a. ALT 2 Switch ................................................................................ CYCLE
b. Main Bus 2 Voltage (M2) .......................................................... CHECK
❍
If M Bus 2 Voltage remains greater than 32 volts:
(1)ALT 2 Switch ................................................................................OFF
(2)Perform
Checklist (do not reset alter-
nator).
Procedure Complete
• N
OTE
•
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
Reissue A