2025 05 ACTS: Electrical

Question 1

Emergency Electrical Panel:
What is the function of the RAT & EMER GEN pushbutton?
FCOM-DSC-24-20

Answer 1

º AUTO – RAT will automatically extend if AC BUS 1 & 2 are not powered and airspeed > 100 knots
º MAN – extend the RAT at any time

Question 2

Emergency Electrical Panel:
How long does it take the RAT to extend and provide power?
FCOM-DSC-24-10-30-30

Answer 2

8 seconds (3 seconds for RAT extension, 5 seconds to pressurize the Blue hydraulic system and power the
EMER GEN)

Question 3

Emergency Electrical Panel:
What does the red FAULT light on the RAT & EMER GEN pushbutton indicate?
FCOM-DSC-24-20

Answer 3

Loss of power to AC Bus 1 + AC Bus 2 and the emergency generator is not supplying power

Question 4

Emergency Electrical Panel:
What powers the emergency generator?
FCOM-DSC-24-10-20

Answer 4

Blue hydraulic power from the RAT

Question 5

Emergency Electrical Panel:
Is there another way to deploy the RAT?
FCOM-DSC-24-10-30-30, FCOM-DSC-29-20

Answer 5

Yes, RAT MAN ON from the HYD panel

Question 6

Emergency Electrical Panel:
What is different about deploying the RAT via the HYD Panel?
FCOM-DSC-24-10-30-40

Answer 6

Blue HYD pressure only – No Emergency Generator

Question 7

Emergency Electrical Panel:
What happens when you push the GEN 1 LINE pushbutton?
FCOM-DSC-24-20

Answer 7

º GEN 1 Line Contactor opens and the white OFF light illuminates
º AC BUS 1 is powered by GEN 2 through the BUS TIE CONTACTOR
º GEN 1 continues to powers 1 fuel pump in each wing tank

Question 8

Emergency Electrical Panel:
When is the GEN1 Line pushbutton used?
FCOM-DSC-24-20

Answer 8

During smoke procedures

Question 9

Electric Panel:
When performing the PRELIMINARY FLIGHT DECK PREPARATION, what is the minimum Battery Voltage?
FCOM-PRO-NOR-SOP-04

Answer 9

25.5 Volts

Question 10

Electric Panel:
What do you do if it is below 25.5V?
FCOM-PRO-NOR-SOP-04

z

Answer 10

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

Question 11

Electric Panel:
When performing the FLIGHT DECK PREPARATION, what are we looking for on the ELEC panel BAT check?
FCOM-PRO-NOR-SOP-06

Answer 11

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

Question 12

Electric Panel:
Will the batteries completely drain if you leave the BAT switches in AUTO after AC power is removed on the
ground?
FCOM-DSC-24-20

Answer 12

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

Question 13

Electric Panel:
How is the BATTERY BUS normally powered?
FCOM-DSC-24-10-30-20

Answer 13

DC BUS 1 through a DC bus tie contactor

Question 14

Electric Panel:
What does the amber FAULT light in the GALLEY pushbutton indicate?
FCOM-DSC-24-20

Answer 14

At least 1 generator load is above 100% rated output

Question 15

Electric Panel:
How does the GALLEY pushbutton work in AUTO?
FCOM-DSC-24-20

Answer 15

Sheds main galley and in-seat power supply if:
º Only 1 generator (APU or Engine) is available in FLIGHT, or
º Only 1 ENGINE generator is available on the GROUND (All galleys are available when APU GEN or EXT
PWR is supplying power)

Question 16

Electric Panel:
What does a FAULT on the ENG GEN pushbutton indicate?
FCOM-DSC-24-20

Answer 16

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

Question 17

Electric Panel:
What does the APU GEN FAULT light indicate?
FCOM-DSC-24-20

Answer 17

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

Question 18

Electric Panel:
When is the APU GEN FAULT light inhibited?
FCOM-DSC-24-20

Answer 18

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

Question 19

Electric Panel:
What is the function of the BUS TIE in the AUTO position?
FCOM-DSC-24-20

Answer 19

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

Question 20

Electric Panel:
What does an IDG FAULT light indicate? (HOT LOP)
FCOM-DSC-24-20

Answer 20

º Low Oil Pressure (inhibited when N2 < 14%)
º High Oil Temperature
º Light is inhibited when IDG is disconnected

Question 21

Electric Panel:
What precautions must you take when disconnecting an IDG?
FCOM-DSC-24-20

Answer 21

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

Question 22

Electric Panel:
How can an IDG be reset?
FCOM-DSC-24-20

Answer 22

On the ground by maintenance

Question 23

Electric Panel:
What is the function of the AC ESS FEED pushbutton in the normal position?
FCOM-DSC-24-20

Answer 23

Allows AC BUS 1 to power the AC ESS BUS

Question 24

Electric Panel:
How is AC ESS FEED transferred from AC BUS 1 to AC BUS 2?
[ FCOM-DSC-24-20 ]

Answer 24

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

Question 25

Electric Panel: What does the AC ESS FEED pushbutton white ALTN light indicate? FCOM-DSC-24-20

Answer 25

AC BUS 2 is powering the AC ESS BUS

Question 26

Electric Panel: What is the purpose of the static inverter? FCOM-DSC-24-10-20

Answer 26

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. (allows battery to supply power to AC ESS bus)

Question 27

Electric Panel: What are the 3 times the batteries are connected to the BATTERY BUS? FCOM-DSC-24-10-30-20, FCOM-DSC-24-10-30-30, FCOM-DSC-49-10-40

Answer 27

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

Question 28

Electric Panel: What is the priority sequence for electrical power (GEARB)? COM-DSC-24-20-10-30-10, FCOM DSC-24-10-30-30

Answer 28

``` º G - Generators - Engine º E - EXT PWR (manually selected) º A - APU Generator º R - RAT Emergency Generator º B - Batteries ```

Question 29

Electric Panel: With the APU green AVAIL light ON and the EXT PWR blue ON light illuminated, which system is powering the aircraft? FCOM-DSC-24-20

Answer 29

EXT PWR

Question 30

Electric Panel: What is the significance of the green, black, and red collared circuit breakers on the flight deck? FCOM-DSC 24-10-20

Answer 30

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

Question 31

Emergency Electrical Panel: What buses are powered by the emergency generator?

Answer 31

-AC ESS and AC ESS SHED -DC ESS and DC ESS SHED

Question 32

What is the significance of red caps or yellow rings on circuit breakers on the flight deck?

Answer 32

Red caps: WTB circuitbreakers have red caps to prevent them from being reset. Yellow rings: CBs that the crew will be guided to pull in order to prolong battery life during a FLIGHT ON BATTERIES ONLY QRH procedure.