Electrical System

Question 1

What does IDG stand for? AOM II 6-10

Answer 1

Integrated Drive Generator

Question 2

How many AC power sources are available to the aircraft?
AOM II 6-10

Answer 2

8; 4 IDGs, 2 APU gens, 2 external sources

Question 3

What turns on an IDG DRIVE light? AOM II 6-6

Answer 3

High Oil Temp
Low Oil Press
Uncorrectable Frequency Fault

Question 4

What is the purpose of the Utility Buses? AOM II 6-13

Answer 4

Load Shedding controlled by the Electrical Control Unit (ELCU)

Question 5

Which buses are powered with #1 and #2 External Power AVAILABLE but not ON? AOM II 6-14

Answer 5

Ground Handling Bus and
Main Deck Cargo Handling Bus

Question 6

Which bus normally powers the SERVICE BUS? Is there an alternate way to power the bus? AOM II 6-12

Answer 6

AC Bus 1 is normal source.
Can be powered by Ground Handling Bus by pushing the L1 Door GROUND SERVICE switch.

Question 7

The APU STBY and Main STBY buses are normally powered from which bus?
AOM II 6-15, 6-22

Answer 7

MAIN STBY BUS: AC BUS 3
APU STBY BUS: AC BUS 3 via CAPT TRANSFER BUS

Question 8

With the loss of the #3 AC Bus, the APU STBY Bus is powered from which source? AOM II 6-15, 6-22

Answer 8

AC BUS 1 (via CAPT TRANSFER BUS)
APU STBY INVERTER via APU HOT BAT BUS (if both AC Bus 3 and 1 fail).

Question 9

How can I isolate the #4 DCIR? AOM II 6-20

Answer 9

De-select the #4 Bus Tie Switch.

Question 10

What will power the Main Deck Cargo Handing Bus with #2 EXT AVAIL and #2 APU AVAIL?
AOM II 6-14

Answer 10

2 EXT Power