ELECTRIC PANEL

Question 1

When performing the PRELIMINARY FLIGHT DECK PREPARATION, what is the minimum Battery Voltage?

Answer 1

25.5 Volts

Question 2

What do you do if it is below 25.5V?

Answer 2

Select BATT push buttons to ON with EXT PWR on aircraft

Question 3

Will the batteries completely drain if you leave the BAT switches in AUTO after AC power is removed?

Answer 3

No. Battery cut-off logic prevents complete discharge when the aircraft is on the ground and unpowered – 22VDC

Question 4

How is the BATTERY BUS normally powered?

Answer 4

DC BUS 1 through a DC tie contactor

Question 5

What does the amber FAULT light in the GALLEY push button indicate?

Answer 5

At least 1 generator load is above 100% rated output

Question 6

How does the GALLEY push button work in AUTO?

Answer 6

a. Sheds main galley and in-seat power supply if:
b. Only 1 generator (APU or Engine) is available in FLIGHT, or
c. Only 1 ENGINE generator is available on the GROUND

Question 7

What does a FAULT on the ENG GEN push button indicate?

Answer 7

a. The generator line contactor is open because of a fault detected by the GCU which could include:
b. Overload
c. Over/under voltage
d. Differential fault (short), and/or;
e. The generator line contactor is open

Question 8

What does the APU GEN FAULT light indicate?

Answer 8

The generator line contactor is open because of a fault detected by the GCU

Question 9

When is the APU GEN FAULT light inhibited?

Answer 9

a. APU speed too low

b. Line contactor OPEN after EXT PWR or ENG GEN takes over

Question 10

What is the function of the BUS TIE in the AUTO position?

Answer 10

a. Allows the BUS TIE CONTACTORS to open and close automatically to maintain power to both AC BUS 1 & 2:
b. Allows a single source to power the entire system
c. Allows connection of the APU GEN or EXT PWR to the system
d. Inhibits multiple sources to connect simultaneously

Question 11

What is the function of the IDG?

Answer 11

Converts variable engine speed to constant speed for optimum generator operation

Question 12

What does an IDG FAULT light indicate?

Answer 12

a. Oil pressure low (inhibited when N2

Question 13

What precautions must you take when disconnecting an IDG?

Answer 13

a. Do not disconnect when the engine is not operating or windmilling
b. Do not hold button longer than 3 seconds

Question 14

How can an IDG be reset?

Answer 14

On the ground by maintenance

Question 15

What is the function of the AC ESS FEED push button in the normal position?

Answer 15

Allows AC BUS 1 to power the AC ESS BUS

Question 16

How is AC ESS FEED transferred from AC BUS 1 to AC BUS 2?

Answer 16

Manually by selecting ALTN on the AC ESS FEED push button or automatically if AC BUS 1 is lost and the switch is in the normal position.

Question 17

What does the AC ESS FEED push button white ALTN light indicate?

Answer 17

AC BUS 2 is powering the AC ESS BUS

Question 18

What is the purpose of the static inverter?

Answer 18

To provide AC power to the AC ESS bus from the battery when the EMG GEN is not online when in the Emergency
Electrical Configuration

Question 19

When is the battery check performed?

Answer 19

During the FLIGHT DECK PREPARATION check of the ELEC panel

Question 20

What does a BAT FAULT light indicate?

Answer 20

Battery charging current is outside limits (BAT contactor opens)

Question 21

What are the 3 times the batteries are connected to the BATTERY BUS?

Answer 21

a. APU start
b. Battery charging
c. AC BUS 1 & 2 not powered and airspeed below 100 knots

Question 22

What is the priority sequence for electrical power (GEARB)?

Answer 22

a. Generators - Engine
b. EXT PWR (manually selected)
c. APU Generator
d. RAT Emergency Generator
e. Batteries

Question 23

With the APU green AVAIL light ON and the EXT PWR blue ON light illuminated, which system is powering the
aircraft?

Answer 23

EXT PWR

Question 24

What is the significance of the green and red collared circuit breakers on the flight deck?

Answer 24

a. Green – Monitored by ECAM system

b. Red – Wing tip brake C/B

Question 25

When performing the FLIGHT DECK PREP, what are we looking for on the ELEC panel BAT check?

Answer 25

1. ECAM ELEC page - select
2. BAT 1 and 2 - Select OFF and then ON
3. Check BAT charge is less than 60 amps and decreasing within 60 seconds