Electrical

Question 0

What happens if a power generating source fails?

Answer 0

Bus ties automatically connect to provide no system degradation

Question 1

How many networks make up the electrical system? Why?

Answer 1

1. Two independent networks

2. Redundancy and fault isolation

Question 2

What components power up the AC system?

Answer 2

2 - integrated drive generators (IDG)
1 - APU
1 - AC GPU
1 - Inverter
1 - RAT

Question 3

What components power up the DC system?

Answer 3

1 - DC GPU
2 - NiCAD Batteries, 24V, 27AH
3 - TRUs, 2 for the IDG, 1 for essential (RAT –> AC ESS BUS –> TRU ESS –> DC ESS BUS 3…)

Question 4

How does the IDG maintain a stable power output?

Answer 4

The IDGs are connected via a constant speed drive (CSD) to the accessory gear box (AGB)

Question 5

What monitors and controls the IDGs?

Answer 5

Each generator has a Generator Control Unit (GDU)

Question 6

Can one IDG supply the entire electrical system?

Answer 6

Yes.

Question 7

What will cause the amber IDG light on the overhead panel to illuminate.

Answer 7

High oil temperature or low oil pressure.