Electrical

Question 1

How many batteries are installed?

Answer 1

1 battery

Question 2

What components provide AC power?

Answer 2

2 engine driven generators
1 APU
1 GPU (external)

Question 3

What components produce DC power?

Answer 3

1 Battery
2 Transformer Rectifiers

Question 4

How is Electrical Power supplied from the APU

Answer 4

AC power is distributed to both AC Transfer Bus 1 and 2 through Bus Tie Breaker 1 and BTB 2

Question 5

What does APU GEN OFF BUS blue light mean

Answer 5

That the APU is running but NOT supplying power to a bus

Question 6

What does the DRIVE light on the overhead panel indicate?

Answer 6

Low oil pressure or under frequency condition in the associated IDG

Question 7

What happens if the AC Transfer Bus’ power source fails?

Answer 7

The BTBs will close allowing any online generator to pick up the load.

Question 8

What does the SOURCE OFF light indicate

Answer 8

No source has been manually selected
OR
The last manually selected source has been disconnected

Question 9

What is indicated by the TR UNIT light illuminating IN FLIGHT

Answer 9

TR1 has failed

Or

Both TR2 and TR3 have failed