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G4 Oral Study > Electrical > Flashcards

Electrical Flashcards

1
Q

What buses are powered by the emergency generator?

A

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

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2
Q

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

A

AUTO- RAT will automatically extend if AC BUS 1 and 2 are not powered AND airspeed is less than 100 its

MAN- Extend the RAT at anytime

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3
Q

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

A

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

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4
Q

What does the red FAULT light on the RAT and EMER GEN pb indicate?

A

Loss of power to AC bus 1 &2 and the emergency generator is not supplying power

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5
Q

What powers the emergency generator?

A

The Blue Hydraulic power from the RAT

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6
Q

Is there another way to deploy the RAT?

A

yes, RAT MAN ON

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7
Q

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

A

You only get Blue HYD pressure, no emergency generator

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8
Q

What happens when you push GEN 1 LINE pb?

A

GEN 1 line contractor 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

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9
Q

When is the GEN 1 line pb pushed?

A

During smoke procedures

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10
Q

When performing the Preliminary Flight Deck Prep, what is the minimum battery voltage?

A

25.5

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11
Q

What do you do if the batteries are below 25.5?

A

Select BATT pb to ON with EXT PWR on the aircraft. This starts the 20 minute charging cycle

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12
Q

When performing the Preliminary Flight Deck Prep, what are we looking for on the ELEC panel BAT check?

A

ECAM ELEC PAGE- select
BAT 1 and 2- OFF then ON
Check BATT Current is less than 60 amps after 10 seconds and continues to decrease

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13
Q

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

A

No. Battery cutoff logic

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14
Q

How is the battery bus normally powered?

A

DC BUS 1 through a DC bus tie contactor

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15
Q

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

A

At least 1 generator load is above 100% rated output

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16
Q

How does the GALLEY pb work in AUTO?

A

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

17
Q

What does a FAULT on the ENG GEN pb indicate?

A

The Generator line contactor is open because the GCU detected a fault, which could be:
-Overload
-Over/under voltage
-Differential fault (short) and/or
-The generator line contactor is open

18
Q

What does the APU GEN FAULT light indicate?

A

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

19
Q

When is the APU GEN FAULT light inhibited?

A

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

20
Q

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

A

-Allows the BUS TIE Contactors to open and close automatically to provide power to both AC bus 1 and 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

21
Q

What does an IDG FAULT light indicate?

A

-Oil Pressure low (inhibited when N2 is less than 14%)
-Oil outlet temperature overheat
-Light is inhibited when IDG is disconnected

22
Q

What precautions must you take when disconnecting the IDG?

A

Do not disconnect when the engine is not operating or windmilling

Do not hold down longer than 3 seconds

23
Q

Can an IDG be reset?

A

Only on the ground by Maintence

24
Q

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

A

Allows AC bus 1 to power the AC ESS BUS

25
Q

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

A

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

26
Q

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

A

AC BUS 2 is powering the AC ESS BUS

27
Q

What is the purpose of the static inverter?

A

To provide AC Power to the AC ESS Bus from the battery when the EMG GEN is not online when in the Emergency Electrical Config

28
Q

What are the 3 times the batteries are connected to the battery bus?

A
  1. APU Start
  2. Battery Charging
  3. AC BUS 1 and 2 not powered and airspeed is less than 100kts
29
Q

What is the priority sequence for electrical power?

A

(GEARB)
G-Generators (engine)
E- EXT PWR
A- APU GEN
R- RAT emergency GEN
B- Batteries

30
Q

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

A

EXT PWR

31
Q

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

A

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

G4 Oral Study (21 decks)

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