S
ECTION
3A: A
BNORMAL
P
ROCEDURES
C
IRRUS
D
ESIGN
E
LECTRICAL
S
YSTEM
SR20
3A-12
P/N 11934-005
M BUS 2 Caution
BATT 1 Caution
M BUS 2
Low Voltage on Main Bus 2
1. Perform
and
Check-
lists.
Procedure Complete
• N
OTE
•
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
message.
BATT 1
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.
Procedure Complete
• N
OTE
•
Battery 1 discharge while Alt 1 is functioning normally, indicative
of an internal power distribution failure within the MCU.
Reissue A