Electrical

Question 1

Q1 | EMERGENCY ELECTRICAL PANEL

What buses are powered by the emergency generator?

Answer 1

• AC ESS and AC ESS SHED
• DC ESS and DC ESS SHED

[ FCOM-DSC-24-10-30-30 ]

Question 2

Q2 | EMERGENCY ELECTRICAL PANEL

What is the function of the RAT & EMER GEN pushbutton?

Answer 2

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

[ FCOM-DSC-24-20 ]

Question 3

Q3 | EMERGENCY ELECTRICAL PANEL

How long does it take the RAT to extend and provide power?

Answer 3

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

[ FCOM-DSC-24-10-30-30 ]

Question 4

Q4 | EMERGENCY ELECTRICAL PANEL

What does the red FAULT light on the RAT & EMER GEN pushbutton indicate?

Answer 4

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

[ FCOM-DSC-24-20 ]

Question 5

Q5 | EMERGENCY ELECTRICAL PANEL

What powers the emergency generator?

Answer 5

Blue hydraulic power from the RAT

[ FCOM-DSC-24-10-20 ]

Question 6

Q6 | EMERGENCY ELECTRICAL PANEL

Is there another way to deploy the RAT?

Answer 6

Yes, RAT MAN ON from the HYD panel

[ FCOM-DSC-24-10-30-30, FCOM-DSC-29-20 ]

Question 7

Q7 | EMERGENCY ELECTRICAL PANEL

What is different about deploying the RAT via the HYD Panel?

Answer 7

Blue HYD pressure only – No Emergency Generator

[ FCOM-DSC-24-10-30-40 ]

Question 8

Q8 | EMERGENCY ELECTRICAL PANEL

What happens when you push the GEN 1 LINE pushbutton?

Answer 8

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

[ FCOM-DSC-24-20 ]

Question 9

Q9 | EMERGENCY ELECTRICAL PANEL

When is the GEN1 Line pushbutton used?

Answer 9

During smoke procedures

[ FCOM-DSC-24-20 ]

Question 10

Q10 | ELECTRIC PANEL

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

Answer 10

25.5 Volts

[ FCOM-PRO-NOR-SOP-04 ]

Question 11

Q11 | ELECTRIC PANEL

What do you do if it is below 25.5V?

Answer 11

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

[ FCOM-PRO-NOR-SOP-04 ]

Question 12

Q12 | ELECTRIC PANEL

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

Answer 12

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

[ FCOM-PRO-NOR-SOP-06 ]

Question 13

Q13 | ELECTRIC PANEL

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

Answer 13

No

Battery cut-off logic prevents complete discharge when the aircraft is on the ground and unpowered – 22VDC

[ FCOM-DSC-24-20 ]

Question 14

Q14 | ELECTRIC PANEL

How is the BATTERY BUS normally powered?

Answer 14

DC BUS 1 through a DC bus tie contactor

[ FCOM-DSC-24-10-30-20 ]

Question 15

Q15 | ELECTRIC PANEL

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

Answer 15

At least 1 generator load is above 100% rated output

[ FCOM-DSC-24-20 ]

Question 16

Q16 | ELECTRIC PANEL

How does the GALLEY pushbutton work in AUTO?

[ FCOM-DSC-24-20 ]

Answer 16

Sheds main galley 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 (All galleys are available when APU GEN or EXT PWR is supplying power)

[ FCOM-DSC-24-20 ]

Question 17

Q17 | ELECTRIC PANEL

What does a FAULT on the ENG GEN pushbutton indicate?

[ FCOM-DSC-24-20 ]

Answer 17

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

[ FCOM-DSC-24-20 ]

Question 18

Q18 | ELECTRIC PANEL

What does the APU GEN FAULT light indicate?

[ FCOM-DSC-24-20 ]

Answer 18

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

[ FCOM-DSC-24-20 ]

Question 19

Q19 | ELECTRIC PANEL

When is the APU GEN FAULT light inhibited?

[ FCOM-DSC-24-20 ]

Answer 19

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

[ FCOM-DSC-24-20 ]

Question 20

Q20 | ELECTRIC PANEL

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

Answer 20

• 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

[ FCOM-DSC-24-20 ]

Question 21

Q21 | ELECTRIC PANEL

What does an IDG FAULT light indicate?

[ FCOM-DSC-24-20 ]

Answer 21

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

[ FCOM-DSC-24-20 ]

Question 22

Q22 | ELECTRIC PANEL

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

[ FCOM-DSC-24-20 ]

Question 23

Q23 | ELECTRIC PANEL

How can an IDG be reset?

Answer 23

On the ground by maintenance

[ FCOM-DSC-24-20 ]

Question 24

Q24 | ELECTRIC PANEL

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

Answer 24

Allows AC BUS 1 to power the AC ESS BUS

[ FCOM-DSC-24-20 ]

Question 25

Q25 | ELECTRIC PANEL

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

Answer 25

• 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

[ FCOM-DSC-24-20 ]

Question 26

Q26 | ELECTRIC PANEL

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

Answer 26

AC BUS 2 is powering the AC ESS BUS

[ FCOM-DSC-24-20 ]

Question 27

Q27 | ELECTRIC PANEL

What is the purpose of the static inverter?

Answer 27

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

[ FCOM-DSC-24-10-20 ]

Question 28

Q28 | ELECTRIC PANEL

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

Answer 28

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

[ FCOM-DSC-24-10-30-20, FCOM-DSC-24-10-30-30, FCOM-DSC-49-10-40 ]

Question 29

Q29 | ELECTRIC PANEL

What is the priority sequence for electrical power (OOIO! Sewers & Caves)?

Answer 29

O - Onside - Engine Generator
O - Outside - EXT PWR (manually selected)
I - Inside - APU Generator
O - Offside - Engine Generator
Sewers (Rats) - RAT Emergency Generator
Caves (Bats) - Batteries

[ FCOM-DSC-24-20-10-30-10, FCOM DSC-24-10-30-30 ]

Question 30

Q30 | ELECTRIC PANEL

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

Answer 30

EXT PWR

[ FCOM-DSC-24-20 ]

Question 31

Q31 | ELECTRIC PANEL

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

Answer 31

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

[ FCOM-DSC 24-10-20 ]