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Airbus 320 > Electrical > Flashcards

Electrical Flashcards

1
Q

What is the normal AC power in the aircraft?

A

115/200V three phase 400Hz

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2
Q

What is the normal DC power in the aircraft?

A

28V DC

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3
Q

What is the normal generator output?

A

90 KVA

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4
Q

What is the emergency generator output?

A

5 KVA

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5
Q

How many generators are required to power the whole electrical system?

A

One

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6
Q

How many Transformer Rectifiers are there?

A

Three.

TR1 and TR2, and in addition the Essential TR

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7
Q

What is the priority order of electrical sources?

A
  1. Engine Generators
  2. External power
  3. APU Generator
  4. Emergency Generator and Batteries
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8
Q

What is the difference between green and black CBs?

A

Green CBs are monitored. 1 minute out will trigger ECAM.

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9
Q

What is the purpose of the static inverter?

A

Transforms DC power from battery 1 into 1 KVA of single-phase 115V 400Hz AC power to power the Essential AC bus.

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10
Q

When is the static inverter activated?

A

If only the batteries are supplying power to the system.
Above 50kts, regardless of battery switch position
Below 50kts, both battery switches must be on.

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11
Q

How is an open line contactor displayed on ECAM?

A

No green line

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12
Q

How are the generator line contactors controlled?

A

By the Generator Control Units, GCUs.

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13
Q

How can a generator fault circuit be reset?

A

By selecting the respective generator pushbutton switch OFF.

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14
Q

What is indicated by a FAULT light on the generator pushbutton switch?

A
  • GCU detects fault

- GLC open, except with the switch in OFF position.

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15
Q

What is the significance of an IDG FAULT light with associated ECAM message?

A
  • IDG outlet oil overheat (>180)

- IDG low oil pressure

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16
Q

When is the FAULT light inhibited on the APU GEN pushbutton switch?

A
  • APU speed low

- EXT PWR or ENG GEN has priority

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17
Q

When is APU GEN displayed in amber on the ECAM elec page?

A

With APU master switch ON and APU GEN pushbutton switch OFF.

18
Q

How is AC ESS BUS normally powered?

A

By GEN 1 through AC BUS 1

19
Q

What happens with the bus tie contactors with the BUS TIE switch in the OFF position?

A

Both will open

20
Q

When does the ACC ESS SHED BUS automatically SHED?

A

If only battery power is available.

21
Q

What is the indication that the ACC ESS SHED BUS has automatically SHED?

A

SHED displayed in amber on ECAM below AC ESS BUS.

22
Q

What is powered by the Galley and Cab PB switch?

A
  • Main galley
  • Secondary galley
  • In seat power
  • IFE
23
Q

When is the Galley and Cab powered?

A
  • Generator 1 and 2 operating
  • APU generator supplying
  • EXT power supplying
24
Q

What happens to the galleys in flight with only one engine generator supplying?

A
  • Everything shed except secondary galleys.
25
Q

What are the commercial loads?

A
  • Cabin and cargo lights
  • Water and waste systems
  • Drain mast ice protection
  • Galley
  • IFE
  • Semi-automatic cargo loading
26
Q

What is the max output from the TRs?

A

200 amps

27
Q

With the BAT switches in AUTO, when will the batteries connect to the DC BAT BUS?

A
  • During APU starting
  • Voltage <26,5V
  • Also connected with loss of all power below 100kts.
28
Q

What is the significance of a BAT pushbutton switch FAULT light?

A
  • Charging current out of limits

- Line contactor open

29
Q

How is the DC BAT BUS normally powered?

A

By the DC BUS 1

30
Q

How is the DC ESS BUS normally powered?

A

By the DC BAT BUS

31
Q

When will the TR line contactor automatically open?

A
  • Overheat

- Minimum current

32
Q

When will the DC ESS SHED BUS automatically shed?

A

When DC ESS is supplied by BAT 2

33
Q

What happens automatically in case of a failure of TR1 or TR2?

A

ESS TR will power the DC ESS bus instead of DC BAT bus.

34
Q

What is the purpose of the Battery Charge Limiter?

A
  • Monitors battery charging

- Controls respective battery contactor connecting battery to DC BAT bus

35
Q

Which buses would be lost with the failure of both TR1 and TR2?

A
  • DC bus 1, DC bus 2

- DC BAT bus

36
Q

What happens to the emergency power configuration on the ground?

A

Below 100kts
- Batteries are connected to the DC BAT bus
Below 50kts
- AC ESS bus is shed leading to loss of all displays.

37
Q

When would the AC ESS FEED pushbutton FAULT light illuminate with associated ECAM?

A

When the AC ESS bus is unpowered

38
Q

What is the effect of pushing the GEN1 LINE pushbutton?

A
  • Opens GEN1 line contactor.

- GEN1 keeps running but only powers 1 fuel pump in each wing tank.

39
Q

Is there a difference in operation when manually extending the RAT on the HYD panel or the EMER ELEC panel?

A

Manually extending the RAT via HYD panel will not start the emergency generator.

40
Q

How long is RAT extension and generator coupling?

A

8 seconds

41
Q

What is the minimum battery voltage during check?

A

25,5 volts

42
Q

During flight with battery only, how long will the battery power last?

A

Approximately 30 minutes

Airbus 320 (15 decks)

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