Electrical

Question 1

What are the sources of aircraft

generated AC power

Answer 1

Four 40 kVA engine driven generators
( 60 kVA for 5 min. and 80 kVA for 5 sec. )

one 40 kVA APU generator

one 9 kVA Ram air turbine

Question 2

How many buses does the AC

electrical system have

Answer 2

Eight total

Primary 1,2,3,4

secondary 1A,2A,3A, AC ESS

Question 3

In the event of single
generator operation, which AC
buses are automatically shed

Answer 3

AC buses 2 and 3

note:
this results in AC buses 2A and 3A
also being shed

Question 4

What can you do with external

DC power

Answer 4

Start the APU

Question 5

What are the 6 primary DC

power sources

Answer 5

TRU 1, TRU2,
ESS TRU 1, ESS TRU 2

Avionics battery

APU battery

Question 6

What are the 4 main DC buses

Answer 6

DC bus 1 and 2

DC ESS bus

BATT bus

note:
remaining DC buses
DC EMER BUS

Avionics bat. direct bus

APU bat. direct bus

Question 7

How long will main batteries last

as sole source of power

Answer 7

Minimum of 15 minutes

Question 8

How do you know when the battery

is not being charged

Answer 8

Amber “CHARGER” next to battery
on Elec. synoptic page

Cyan CAS
“APU or AV BATT CHGR FAIL”

Question 9

Which DC buses are automatically

shed during single TRU operation

Answer 9

DC buses 1 and 2

note:
The essential tie contactor will
Allow power to the
BATT bus and DC ESS bus

Question 10

During single generator operation

which bus or buses are last to shed

Answer 10

AC buses 4 and 1