Chapter 6 – Electrics

Question 1

1. What does IDG stand for?

Answer 1

a. Integrated Drive Generator (AOM 6-5)

Question 2

2. How many AC power sources are available to the AC?

Answer 2

a. 8 (2 External, 2 APU gens, 4 IDG’s)(AOM 6-10)

Question 3

3. What turns on an IDG DRIVE light?

Answer 3

a. High Oil Temp
b. Low Oil Pressure
c. GCB open due to uncorrectable freq fault (AOM 6-6)

Question 4

4. What is the purpose of the utility buses?

Answer 4

a. Each utility bus is controlled by an electrical load control unit (ELCU) that protects the
electrical system from utility bus faults and provides load management through automatic OR manual load shedding. (AOM 6-13)

Question 5

5. What buses are powered with #1&2 external power available but not on?

Answer 5

a. Ground Handling b. Main Deck Cargo Handling (AOM 6-13,14)

Question 6

6. What bus normally powers the service bus? Is there an alternate means to power the bus?

Answer 6

a. AC Bus 1 is Normal Source b. Ground Handling is alternate source via switch at Door 1L (AOM 6-12)

Question 7

7. The APU and Main Standby buses are normally powered from which bus(es)?

Answer 7

a. AC Bus 3 (APU standby bus is from AC Bus 3 through the captains transfer bus) (AOM 6-
14,15)

Question 8

8. With the loss of # 3 AC bus, the APU standby bus is powered from which source?

Answer 8

a. AC Bus 1 (Again, through the captains transfer bus)(AOM 6-15)

Question 9

9. How can I isolate the #4 DCIR?

Answer 9

a. De-select #4 Bus Tie switch (AOM 6-20)

Question 10

10. What will power the cargo bus with #2 external available and #2 APU gen available?

Answer 10

a. #2 Ext Power (AOM 6-14) ns