15.1.6 Perform Electrical System Operations and Procedures

Question 1

What is the source order for powering the left and right main AC busses?

Answer 1

• Respective IDG
• APU generator
• Opposite IDG

Question 2

What does the ground service bus power?

Answer 2

• The main battery charger
• The APU battery charger
• Misc. cabin and system loads

Question 3

What normally powers the ground service bus?

Answer 3

The right main AC bus. Alternate sources are APU and EXT

Question 4

What powers the ground handling bus?

Answer 4

Either APU or EXT power available (not necessarily on)

Question 5

What is the normal power source for the standby AC bus?

Answer 5

The left AC Bus

Question 6

What is the normal power source for the standby DC bus?

Answer 6

The left DC Bus

Question 7

What does the Hydraulic Driven Generator (HDG) power?

Answer 7

7 busses:

• Standby DC bus
• Standby AC bus
• Left AC transfer bus
• Right AC transfer bus
• Captain’s flight instrument transfer bus
• Hot battery bus
• Battery bus

Question 8

Which switches must be in AUTO for the DC bus tie to operate?

Answer 8

Both bus tie switches must be in auto

Question 9

The left BUS TIE ISLN light on the overhead panel indicates either:

Answer 9

The left AC bus tie breaker (BTB) is open due to a fault or the switch is OFF

Question 10

Prior to establishing electrical power, with the battery switch on and the standby power switch in auto, what powers the standby DC and AC busses?

Answer 10

The main battery