Electrical 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 pushbuttons to ON with EXT PWR on aircraft. This starts the charging cycle (approximately 20min required)

Question 3

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

Answer 3

ECAM ELEC page – select
BAT 1 & 2 – OFF then ON
Check BATT current is < 60 amps after 10 seconds and continues to decrease

Question 4

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

Answer 4

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

Question 5

How is the BATTERY BUS normally powered?

Answer 5

DC BUS 1 through a DC tie contactor

Question 6

What does the amber FAULT light in the GALLEY pushbutton indicate?

Answer 6

At least 1 generator load is above 100% rated output

Question 7

How does the GALLEY pushbutton work in AUTO?

Answer 7

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

Question 8

What does a FAULT on the ENG GEN pushbutton indicate?

Answer 8

The generator line contactor is open because of a fault detected by the Generator Control Unit (GCU) which could include:
Overload Over/under voltage
Differential fault (short), and/or;
The generator line contactor is open

Question 9

What does the APU GEN FAULT light indicate?

Answer 9

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

Question 10

When is the APU GEN FAULT light inhibited?

Answer 10

APU speed too low.
Line contactor OPEN after EXT PWR or ENG GEN takes over.

Question 11

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

Answer 11

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

Question 12

What does an IDG FAULT light indicate?

Answer 12

Oil pressure low (inhibited when N2 < 14%)
Oil outlet temperature overheat
Light is inhibited when IDG is disconnected

Question 13

How can an IDG be reset?

Answer 13

On the ground by maintenance

Question 14

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

Answer 14

Allows AC BUS 1 to power the AC ESS BUS

Question 15

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

Answer 15

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

Question 16

What does the AC ESS FEED pushbutton white ALTN light indicate?

Answer 16

AC BUS 2 is powering the AC ESS BUS

Question 17

What is the purpose of the static inverter?

Answer 17

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 18

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

Answer 18

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

Question 19

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

Answer 19

Generators  -  Engine.
EXT  PWR (manually  selected).
APU Generator.
RAT  Emergency  Generator.
Batteries

Question 20

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

Answer 20

EXT PWR

Question 21

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

Answer 21

Green – Monitored by ECAM
Red – Wing tip brake C/B
Black – Not monitored by ECAM

Question 22

What precautions must you take when disconnecting an IDG?

Answer 22

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