Electrical

Question 1

Where does the DC service switch get power from?

Answer 1

DC service switch APU battery direct bus

Question 2

Why do we not leave the airplane in the service configuration using the DC service switch?

Answer 2

It drains the battery

Question 3

With the battery master switch on (no AC power established) which screens come online?

What is the limitation?

Answer 3

ED1 and ED2.

5 minutes for lack of cooling by AC fans

Question 4

What does the AVAIL illumination on the AC switch light indicate?

Answer 4

AC with correct voltage, frequency and phase

Question 5

What does the FAULT illumination on the IDG switch light indicate?

Answer 5

HOTLOP hot oil temperature low oil pressure

Question 6

What does the DISC illumination on the IDG switch light indicate?

Answer 6

IDG disconnected automatically do do over-temp, over torque.

Or manually

Question 7

How can an IDG be disconnected?

Answer 7

IDG DISC button or shear. Reconnect by maintenance on ground

Question 8

Explain the auto disconnect oven IDG

Answer 8

High temperature

Question 9

What does the illumination of the AC ESS XFER switch light indicate?

Answer 9

AC ESS not powered by normal source (AC1)

Question 10

How many generators are installed on the airplane?

Answer 10

4

Question 11

What does the illumination of the FAIL on the AUTO XFER switch light indicate?

Answer 11

Bus fault or GEN over current

Question 12

What are the main generators rated at?

Answer 12

40 KVA

Question 13

What’s the ADG rated at?

Answer 13

15 kVA

Question 14

What would cause the ADG to auto deploy in flight?

Answer 14

Loss of all AC power, below 50 V

Question 15

If the ADG is deployed in flight, what does it power?

Answer 15

HYD3B, 
AC ESS bus, 
flaps/slats at half speed, 
STAB trim channel 2, 
ADG bus