Electrical

Question 1

How many AC Sources can you name?

Answer 1

1. Engine Gens
2. APU Gen
3. Emergency generator via RAT (Ram Air Turbine)
4. Ext Power
5. Static Inverter

Question 2

What are the order of priority for AC power sources?

Answer 2

1. Eng, 2. EXT 3. APU 4. Emerg Gen 5. Batteries(inverter)

Question 3

What DC Power sources can you name

Answer 3

1. Transformer Rectifiers (2 primary ones)
2. Backup TR (via the RAT)
3. Batteries

Question 4

What does a green line on the ELEC ECAM page between a power source and a bus signify

Answer 4

That the line contactor (i.e Generator Line Contactor), is closed (power is flowing)

Question 5

What are the generator limitations (volts and hz)

Answer 5

1. Turns amber if: Volts outside 110-120, hz outside 390-410

Question 6

What powers the AC ESS Bus?
Normally
With loss of 1 and 2 eng gens
with loss of all gens

Answer 6

AC Bus 1 (eng gen 1)
AC bus 2 (loss of gen1)
Emergency Generator (loss of both gens)
Static inverter/battery (loss of all gens, or while the RAT powers up)

Question 7

When will the ESS Bus shed its Shed Bus?

Answer 7

When it is powered by the batteries

Question 8

When will the galley bus automatically shed?

Answer 8

If only one generator is online during flight

Question 9

When will the batteries start charging? (Below what voltage)

Answer 9

Below 26.5

Question 10

When is the static inverter operating?

Answer 10

• During Emergency Electrical, until the RAT spools up (around 8 seconds)
• If the RAT stalls, or if airspeed drops below 100kts

Question 11

Which bus powers the DC batt bus?

Answer 11

DC bus 1

Question 12

When does the batt bus turn amber?

Answer 12

Voltage below 25V

Question 13

When is emergency power automatically brought online (RAT deployment)

Answer 13

With AC Bus 1&2 unpowered

Question 14

What does the RAT power directly?

Answer 14

The blue hydraulic system

Question 15

What powers the Emergency Generator?

Answer 15

Blue hydraulic pressure

Question 16

Below what voltage should you charge the batteries

Answer 16

25.5V

Question 17

What is the maximum amount of time you should press the IDG pushbutton, to disconnect the IDG?

Answer 17

Max 3 seconds

Question 18

What do the different circuit breaker colors signify?
1. Green
2. Black
3. Red cap

Answer 18

1. Monitored (will show on ECAM after 1 minute)
2. Unmonitored
3. Reset by maint action only

Question 19

What does the static inverter do

Answer 19

Convert DC power from battery 1 into 1kVA of single phase 115V 400hz

Question 20

What powers the DC ESS BUS during flight with loss of all gens

Answer 20

Batt hot bus 2

Question 21

What powers the static inverter in flight with no gens

Answer 21

Hot batt bus 1