AC/DC BUS

Question 1

What are the 4 AC busses?

Answer 1

AC bus 1
AC bus 2
AC ESS (essential) bus
AC SERV (service) bus

Question 2

AC Bus 1 priority system

Answer 2

Generator 1
APU generator
Generator 2
External power

Question 3

AC Bus 2 priority system

Answer 3

Generator 2
APU generator
Generator 1
External power

Question 4

What charges the main battery

Answer 4

AC BUS 1

Question 5

What charges the APU battery

Answer 5

AC service bus

Question 6

If TRU 1 and TRU2 both fail what ties close

Answer 6

CROSS TIE and ESS TIE to assist in splitting the load

Question 7

DC EMER BUS

Answer 7

Powers fire protection powered by APU DIR BUS or BATT BUS

Question 8

EMER BUS is depicted only when

Answer 8

Bus has failed or one of the sources not powered