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Systems Questions > ELECTRICAL > Flashcards

ELECTRICAL Flashcards

1
Q

1 | What buses are powered by the emergency generator? [ FCOM-DSC-24-10-30-30 ]

A

º AC ESS and AC ESS SHED
º DC ESS and DC ESS SHED

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2
Q

2 | What is the function of the RAT & EMER GEN pushbutton? [ FCOM-DSC-24-20 ]

A

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

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3
Q

3 | How long does it take the RAT to extend and provide power? [ FCOM-DSC-24-10-30-30 ]

A

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

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4
Q

4 | What does the red FAULT light on the RAT & EMER GEN pushbutton indicate? [ FCOM-DSC-24-20 ]

A

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

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5
Q

5 | What powers the emergency generator? [ FCOM-DSC-24-10-20 ]

A

º Blue hydraulic power from the RAT

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6
Q

6 | Is there another way to deploy the RAT? [ FCOM-DSC-24-10-30-30, FCOM-DSC-29-20 ]

A

º Yes, RAT MAN ON from the HYD panel

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7
Q

7 | What is different about deploying the RAT via the HYD Panel? [ FCOM-DSC-24-10-30-40 ]

A

º Blue HYD pressure only – No Emergency Generator

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8
Q

8 | What happens when you push the GEN 1 LINE pushbutton? [ FCOM-DSC-24-20 ]

A

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

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9
Q

9 | When is the GEN1 Line pushbutton used? [ FCOM-DSC-24-20 ]

A

º During smoke procedures

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10
Q

10 |When performing the PRELIMINARY FLIGHT DECK PREPARATION, what is the minimum Battery Voltage?
[ FCOM-PRO-NOR-SOP-04 ]

A

º 25.5 Volts

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11
Q

11 |What do you do if it is below 25.5V? [ FCOM-PRO-NOR-SOP-04 ]

A

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

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12
Q

12 |When performing the FLIGHT DECK PREPARATION, what are we looking for on the ELEC panel BAT check?
[ FCOM-PRO-NOR-SOP-06 ]

A

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

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13
Q

13 |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 ]

A

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

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14
Q

14 |How is the BATTERY BUS normally powered? [ FCOM-DSC-24-10-30-20 ]

A

º DC BUS 1 through a DC bus tie contactor

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15
Q

15 |What does the amber FAULT light in the GALLEY pushbutton indicate? [ FCOM-DSC-24-20 ]

A

º At least 1 generator load is above 100% rated output

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16
Q

16 |How does the GALLEY pushbutton work in AUTO? [ FCOM-DSC-24-20 ]

A

º 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)

17
Q

17 |What does a FAULT on the ENG GEN pushbutton indicate? [ FCOM-DSC-24-20 ]

A

º 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

18
Q

18 |What does the APU GEN FAULT light indicate? [ FCOM-DSC-24-20 ]

A

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

19
Q

19 |When is the APU GEN FAULT light inhibited? [ FCOM-DSC-24-20 ]

A

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

20
Q

20 |What is the function of the BUS TIE in the AUTO position? [ FCOM-DSC-24-20 ]

A

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

21
Q

21 |What does an IDG FAULT light indicate? [ FCOM-DSC-24-20 ]

A

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

22
Q

22 |What precautions must you take when disconnecting an IDG? [ FCOM-DSC-24-20 ]

A

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

23
Q

23 |How can an IDG be reset? [ FCOM-DSC-24-20 ]

A

º On the ground by maintenance

24
Q

24 |What is the function of the AC ESS FEED pushbutton in the normal position? [ FCOM-DSC-24-20 ]

A

º Allows AC BUS 1 to power the AC ESS BUS

25
Q

25 |How is AC ESS FEED transferred from AC BUS 1 to AC BUS 2? [ FCOM-DSC-24-20 ]

A

º 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

26
Q

26 |What does the AC ESS FEED pushbutton white ALTN light indicate? [ FCOM-DSC-24-20 ]

A

º AC BUS 2 is powering the AC ESS BUS

27
Q

27 |What is the purpose of the static inverter? [ FCOM-DSC-24-10-20 ]

A

º 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

28
Q

28 |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 ]

A

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

29
Q

29 |What is the priority sequence for electrical power (GEARB)? [ FCOM-DSC-24-20-10-30-10, FCOM DSC-24-10-30-30 ]

A

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

30
Q

30 |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 ]

A

º EXT PWR

31
Q

31 |What is the significance of the green and red collared circuit breakers on the flight deck? [ FCOM-DSC 24-10-20 ]

A

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

Systems Questions (19 decks)

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