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A321 > Electric > Flashcards

Electric Flashcards

1
Q

How many AC power source does aircraft has ?

A
  • 2 Engine driven generator
  • 1 APU
  • Ground power unit
  • 1 Emergency generator
  • Battery through STATIC INVERTER
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2
Q

What is the priority sequence for electrical power ?

A

(GEAR.B)
-Gen driven by engine
-External power
-APU
-RAT (emer gen)
-Battery

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3
Q

What is the output of Engine driven generator ?

A

-90KVA
-115/200V
-400HZ
-3 phase

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4
Q

Which system control the output of engine driven generator ?

A

Two Generators Control Units (GCU)

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5
Q

What are the function of GCUs ?

Generators Control Units

A

-Control the frequency and voltage of generator output.
-Protect the network by controlling the associated generator line contactor.

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6
Q

What is the output of APU gen ?

Auxilirary power unit

A

the same as engine driven gen

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7
Q

What is the function of GPCU ?

Ground Power Control Unit

A

Protect the network by controlling the external power contactor

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8
Q

What is the function of GAPCU ?

Ground and Auxiliary Power Control Unit

A

-Regulate via APU ECB (Electronic Control Box), the frequency and voltage of APU gen
-Protect the network by controlling the external power contactor and APU gen line contactor

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9
Q

What is the output of Emergency Generator ?

A

-5KVA
-115/200V
-400Hz
-3 phase

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10
Q

Which system control and monitor emergency generator ?

A

GCUs

Generators Control Units

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11
Q

What is the function of Static Iverter ?

A

Transforms DC power from BAT 1 into AC, which then supply AC ESSENTIAL BUS

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12
Q

What is the output of Static Iverter ?

A

-1KVA
-115V
-400Hz
-1 phase

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13
Q

When does Static Iverter activate automatically ?

A

Only bat supply the a/c and:
-A/C speed > 50 kt, regardless of BAT 1 and 2 pb position
-A/C speed < 50kt, both BAT 1 and 2 pb on

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14
Q

What are the function of TRs ?

Trasform Rectifier

A

Convert AC into 200A of DC

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15
Q

How many TRs does system contain ?

Trasform Rectifier

A
  • TR 1 and TR 2
  • ESS TR
  • TR entertainment
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16
Q

Which system does TR 1 and TR 2 power ?

Trasform Rectifier

A

DC 1 and DC 2 BUS bar

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17
Q

Which system does ESS TR power ?

A

DC ESS BUS (Source from EMER GEN)

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18
Q

Which system does TR entertainment power ?

Trasform Rectifier

A

DC Entertainment BUS

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19
Q

What is the function of DC Entertainment BUS ?

A

Power In-Flight Entertainment System (IFE)

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20
Q

What is the capacity of batteries ?

A

Each Bat has a capacity of 23 Ah (Amper Hour)

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21
Q

Which bus are BAT permanently connected to ?

A

HOT BUS

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21
Q

What are the function of BCLs ?

Battery Charge Limiter

A

Mornitors battery charging and controls its battery contactor

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21
Q

How many type of circuit breaker does a/c has ?

A

Two types
-Monitored (green)
-Non-monitored (black)

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22
Q

Which CBs should never be reset ?

A

Wing Tip Brake C/Bs, the one with red cab

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23
Q

What happen if a C/B remain pulled ?

A

Any additional tripped C/B on the same panel is not detected by ECAM.

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24
Q

What GALLEY SHED message mean ?

A

The main galley, the in-seat power supply and IFE are shed

In-Flight Entertainment System

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25
Q

When will GALLEY SHED message appear ?

A

When there is only one gen power the a/c (except on ground with APU or external power ON)

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26
Q

When will BAT connect to DC BAT BUS automatically ?

A

-APU starting
-Bat voltage < 26.5 (bat charging)
-Loss of AC BUS 1 and 2 when speed < 100kt

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27
Q

Can BAT be discharged completely when a/c on ground ?

A

No, an automatic cut off logic will prevent that

28
Q

When will RAT deploy automatically ?

A

Lost AC 1 and AC 2 and speed > 100kt

29
Q

How can RAT supply electric power ?

A

RAT powers the blue hydraulic system, which then drives the emergency generator by mean of hydraulic motor

30
Q

What happen when there is only BAT power the system and speed < 50kt ?

A

AC ESS BUS is SHED, all the display units are lost

31
Q

How long does it take for emergency gen coupling ?

A

8s (5s for RAT deploy, 3s for powering)

32
Q

FAULT lt on BAT pb ?

A

BCL is failed. Accompany with ECAM alert, when charge current is outside limits

Battery Charge Limiter

33
Q

What happen when FAULT lt of BAT pb illuminate, with ECAM alert ?

A

BAT contactor open automaticaly

34
Q

What happen when maintaining IDG pb > 3s ?

Integrated drive generator

A

May damage the IDG disconnection mechanism

Intergrated drive generator

35
Q

What are cautions when disconnect IDG ?

Integrated drive generator

A
  • Do not hold IDG pb more than 3s
  • Only disconnect when eng running or windmilling

Intergrated drive generator

36
Q

Can IDG be reconnected in flight ?

Integrated drive generator

A

No, only on ground

37
Q

FAULT lt on IDG pb ?

Integrated drive generator

A
  • IDG oil outlet overheat
  • IDG oil press is low (inhibit at low eng speed N2 < 14%)
38
Q

When will IDG disconect automatically ?

Integrated drive generator

A

When temp reach 200℃

39
Q

FAULT lt of GEN pb ?

A
  • GCU trips it
  • Opening of line contactor (except when pb is OFF)
40
Q

FAULT lt of APU GEN pb ?

A

Opening of line contactor

41
Q

When is FAULT lt of APU GEN pb inhibited ?

A

-APU speed is too low
-APU on but EXT PWR or ENG GEN takes over

42
Q

What Elec configuration is a/c in when failed AC 1 and GEN 2

A

EMER CONFIG

43
Q

FAULT lt of AC ESS FEED pb ?

A

AC ESS BUS is not powered

44
Q

FAULT lt of GALLEY pb ?

A

When load of any generator is > 100% of rated output

45
Q

When COMMERCIAL pb is OFF, what system is not powered ?

A
  • Cabin and cargo lights
  • Water and toilet system
  • Drain mast ice protection
  • Galley
  • Passenger entertainment system
  • Semi-automatic cargo loading
46
Q

FAULT lt of EMER GEN pb ?

A

AC 1 and 2 are not powered

47
Q

What happen when push EMER GEN TEST pb ?

A

-If AC NORMAL BUSES are supplied
● Then EMER GEN is driven if blue elec pump in running. AC ESS BUS and DC ESS BUS is connected to EMER GEN
● ECAM display ELEC page automaticaly (only on ground)
-If only BATs supply a/c
● The static inverter powers the AC ESS BUS

48
Q

What happen when push GEN 1 LINE pb ?

A

GEN 1 disconnect and only powers one fuel pump on each wing tank
Gen 2 powers both AC BUS 1 and 2

49
Q

Which cockpit lights is avail during an emer elec situation ?

A

-Right side dome light
-Main panel flood light (left two columns only)
-Standby compass light

50
Q

Is this possible to connect the eng driven gen in parallel ?

A

NO

51
Q

After an IDG is disconnected inflight, why do you get a GALLEY SHED indication ?

A

To remind that main galley is shed because there is only one gen running

52
Q

Where is the ground power connector ?

A

Near the nosewheel on the right side of fuselage

53
Q

How do you perform a BAT check ?

A
  • Turn off both BAT
  • Check BAT abv 25.5V (if not charge)
  • Turn both BAT to AUTO
  • Check amp decrease below 60 within 5s
54
Q

What is the power source of FADEC ?

Full authority digital engine control

A

FADEC have their own alternator when N2 abv a set value. If alternator fail, FADEC are powered by main elec system

Full authority digital engine control

55
Q

When will you charge BAT ?

A

When BAT voltage < 25.5V

56
Q

How do you charge BAT ?

A
  • Turn BAT to AUTO
  • Use EXT PWR
  • Charge in 20 min
  • After 20 min turn BAT OFF
  • Check abv 25.5
  • Turn BAT to AUTO
57
Q

What is the minimum BAT voltage for operation ?

A

25.5V

58
Q

How is DC BAT BUS normally powered ?

A

Via DC BUS 1 through DC tie contactor

59
Q

When is the BAT checked performed ?

A

During FLIGHT DECK PREPARATION

60
Q

How long will each ADIRU stay on BAT power ?

A
  • ADIRU 2&3 remain for 5min until GEN can be restored
  • ADIRU 1 ( or ADIRU 3 if ATT HDG CAPT 3 is selected) remains until GEN restored or BAT fail
61
Q

How is IDG cooled ?

Integrated drive generator

A

By fuel from HP fuel pump drawn in from the fuel manifold

62
Q

What is the function of IDG ?

Integrated drive generator

A

Convert variable engine speed to constant speed for optimum generator operation

63
Q

What is the function of BUS TIE in AUTO position ?

A

Allow BUS TIE CONTACTORS to open and close automatically to maitain power to both AC BUS 1&2

64
Q

What is the function of GALLEY pb in AUTO position ?

A

Sheds main galley, in seat power and IFE when there is only one GEN running (except on ground with APU or EXT PWR ON )

65
Q

ALTN lt on AC ESS FEED ?

A

AC ESS BUS is powered from AC BUS 2

66
Q

What lights illuminate when DC ESS SHED BUS fails ?

A
  • Floor proximity emergency escape path marking system
  • Overhead emergency lighting
  • EXT signs
67
Q

What buses are powered by EMER GEN ?

A

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

68
Q

When is it normal to see ENG GEN FAULT lt illuminate ?

A

Prior to engine start

69
Q

When should the red FAULT lt on the RAT & EMER GEN pb be expected ?

A

During 8s of RAT deployment

70
Q

When would you use GEN 1 LINE pb ?

A

SMOKE procedure

A321 (25 decks)

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