ELEC panel

Question 1

What is the minimum 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 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
• turn BAT 1 & 2 OFF then ON
• check BAT charge current is <60amps and decreasing within 10 secs
• if it fails the test, wait until the end of the charging cycle, and repeat the test.

Question 5

Describe the electrical power system.

Answer 5

• the electrical power system consist of a 3-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 pushbutton prior to engine start?

Answer 7

FAULT indication

Question 8

Define and describe the IDG

Answer 8

• intergrated 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 IDG pushbutton, being careful not to hold the pushbutton for longer than 3 seconds.

Question 10

How would an IDG be reconnected?

Answer 10

This cannot be down 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 the 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

What buses are powered by the EMER GEN?

Answer 18

• AC ESS BUS
• AC ESS SHED
• DC ESS BUS by the ESS TR
• DC ESS SHED

Question 19

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

Answer 19

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

Question 20

What does a BAT FAULT light indicate?

Answer 20

• battery charging current outside limits.

- BAT contractor opens.

Question 21

When are the batteries connected to the battery bus?

Answer 21

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