ELEC Panel

Question 1

What is the minimum battery voltage?

Answer 1

 25.6V

Question 2

What would a pilot do if BAT voltage is 25.5 or below on originating preflight?

Answer 2

Charge the batteries with external power by selecting BAT pushbuttons to AUTO

Question 3

How long should the batteries be charged?

Answer 3

 20 minutes, then recheck the voltage

Question 4

Explain how to conduct the BAT check. What if it fails the test?

Answer 4

• Select ELEC on ECAM
•  Tur nBA T1&2 OFF then ON
•  Check BAT charge current is < 60 amps and decreasing within 10 seconds
•  If it fails the test, call maintenance

Question 5

Describe the electrical power system.

Answer 5

- The electrical power system consists of a three-phase 115/200-volt 400- hertz constant frequency AC system and a 28-volt DC
- Normally, the system produces alternating current, some of which is then transformed into direct current for certain applications.
- Each of the aircraft’s three generators can supply the whole network.
- If all normal AC generation is lost, an emergency generator can supply AC
power.
- If all AC generation is lost, the system can transform DC power from the
batteries into AC power.

Question 6

If all AC power is lost, what happens?

Answer 6

 DC power from the batteries is converted into AC.

Question 7

What would be an expected indication in the GEN pushbuttons prior to engine start?

Answer 7

 FAULT indication.

Question 8

Define and describe an IDG.

Answer 8

•  Integrated Drive Generator

-  Takes variable engine output and gives a constant output.

Question 9

How would a pilot disconnect an IDG?

Answer 9

Lift the red guard and push the IDG pushbutton, being careful not to hold the pushbutton for longer than three seconds.

Question 10

How would an IDG be reconnected?

Answer 10

 This cannot be done by the flight crew – it is a maintenance function.

Question 11

Describe the function of the BUS TIE in AUTO.

Answer 11

• Allows a single source of power to run entire electrical system
•  Allows connection of the APU GEN or EXT power to system
•  Inhibits multiple sources connected simultaneously

Question 12

If GEN 1 fails to supply AC Bus 1, what happens?

Answer 12

Gen 2 (or APU GEN if available) powers the system through the bus tie.

Question 13

How is the AC ESS bus normally powered?

Answer 13

 From AC bus 1

Question 14

If AC BUS 1 fails, how is the AC ESS bus powered?

Answer 14

 AC bus 2 automatically feed the AC ESS bus.

Question 15

What indication will be present on the ELEC panel that AC BUS 2 is feeding the AC ESS bus?

Answer 15

 AC ESS FEED ALTN light illuminated

Question 16

What does a GALLEY fault light indicate?

Answer 16

 At least one generator load is above 100% rated output.

Question 17

Explain the AUTO function of the GALLEY pushbutton.

Answer 17

 Sheds main galley if only 1 GEN is available

Question 18

How is the BATTERY BUS normally powered?

Answer 18

 DC BUS 1 through the DC tie contactor

Question 19

What buses are powered by the EMER GEN?

Answer 19

•  AC essential bus

-  DC essential bus by the essential TR

Question 20

What is the difference of the APU GEN FAULT and the ENG GEN FAULT?

Answer 20

Both are indicators of a line contactor open. The difference is that the ENG GEN fault may also indicate a fault detected by the ENG GCU.

Question 21

What does a BAT FAULT light indicate?

Answer 21

•  Battery charging current outside limits.

-  BAT contactor opens.

Question 22

When are the batteries connected to the battery bus?

Answer 22

•  APU start
•  Battery charging
•  AC BUS 1 & 2 not powered and airspeed below 100 knots