ELEC Panel Flashcards

1
Q

What is the minimum battery voltage?

A

 25.6V

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2
Q

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

A

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

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3
Q

How long should the batteries be charged?

A

 20 minutes, then recheck the voltage

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4
Q

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

A
  • 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
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5
Q

Describe the electrical power system.

A

- 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.

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6
Q

If all AC power is lost, what happens?

A

 DC power from the batteries is converted into AC.

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7
Q

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

A

 FAULT indication.

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8
Q

Define and describe an IDG.

A

- Integrated Drive Generator
- Takes variable engine output and gives a constant output.

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9
Q

How would a pilot disconnect an IDG?

A

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

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10
Q

How would an IDG be reconnected?

A

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

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11
Q

Describe the function of the BUS TIE in AUTO.

A
  • 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
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12
Q

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

A

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

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13
Q

How is the AC ESS bus normally powered?

A

 From AC bus 1

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14
Q

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

A

 AC bus 2 automatically feed the AC ESS bus.

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15
Q

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

A

 AC ESS FEED ALTN light illuminated

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16
Q

What does a GALLEY fault light indicate?

A

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

17
Q

Explain the AUTO function of the GALLEY pushbutton.

A

 Sheds main galley if only 1 GEN is available

18
Q

How is the BATTERY BUS normally powered?

A

 DC BUS 1 through the DC tie contactor

19
Q

What buses are powered by the EMER GEN?

A

- AC essential bus
- DC essential bus by the essential TR

20
Q

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

A

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.

21
Q

What does a BAT FAULT light indicate?

A

- Battery charging current outside limits.
- BAT contactor opens.

22
Q

When are the batteries connected to the battery bus?

A

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