Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

AIRBUS A320 > ELECTRICAL SYSTEM > Flashcards

ELECTRICAL SYSTEM Flashcards

1
Q

How many generators (incl APU) are needed to run the electrical system?

A

1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

In flight, during a generator failure, what is automatically shed?

A

Main Galley Power

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the main difference between when GEN 1 fails versus GEN 2?

A

GEN 1 is connected to the ESS BUS and SHED BUS while GEN 2 requires the AC ESS FEED button to be depressed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

When the RAT deploys, what buses does it power?

A

AC ESS BUS
DC ESS BUS
AC SHED BUS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

In an emergency, what does BAT 1 power?

A

AC ESS BUS through a static inverter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

In an emergency, what does BAT 2 power?

A

DC ESS BUS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are the electrical sources priority?

A

Generators
External power
APU
RAT
BATTERIES

GEARB

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are the electrical capacities of the generators and the APU?

A

90 KVA
3-phase
115 V
400 Hz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the electrical capacities of the RAT?

A

5 KVA
3-phase
115-200 V
400 Hz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the purpose of a TR (Transformer Rectifier)

A

Convert AC to DC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

When will you see a green arrow connected to the battery?

A

Only when current is >1 amp

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What are the limitations for pushing the IDG FAULT buttons?

A

Don’t depress for more than 3 seconds
Engine must be running or windmilling
Can only be reset on the ground

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

When will you get the IDG FAULT light?

A

High IDG Oil Temp, over 180 deg C
Low IDG Oil Pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

When will the batteries start charging?

A

< 26.5 V

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

When will the battery contactors close?

A

AC BUS 1&2 not powered by GENS or other sources
Batteries need charging

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

How long are the batteries prevented from charging after an APU start?

A

30 minutes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

During pre-flight inspection, what white lights should be present on the ELEC overhead panel?

A

None, lights should be out

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

When you turn the battery on, what is the max charging current allowed?

A

<60 A and decreasing within 10 seconds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What tells you, just by looking at the overhead panel, that the APU is powering the AC system?

A

AVAIL light on the APU START button AND AVAIL light on the EXT POWER button

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

When you start engine nr 2 first with the APU connected, what happens to the BUS TIE?

A

Opens, APU now powers AC BUS 1 and GEN 2 powers AC BUS 2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

RAT & EMER GEN FAULT light is on, what could this mean when deploying the RAT?

A

Means you are running on batteries as it takes 8 seconds for the RAT to spool up

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What is the MIN speed for the RAT to function properly?

A

140 kts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

During landing, at what speed does the EMER GEN become unavailable?

A

125 kts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What happens below 50 kts during total electrical failure?

A

All displays go blank
VHF 1 goes off line
No NW Steering

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What is the function of the Static Inverter?

A

To transform DC power from BAT 1 into 1 KVA of single phase 115V/400Hz AC power which then is supplied to the AC ESS BUS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

How many types of Circuit Breakers does the A320 have?

A

Green: Monitored. ECAM msg after tripped for 1 min
Black: Non-monitored

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Can you re-connect an IDG in flight?

A

No

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

AC Power (115V) can be provided by which power sources?

A

2 GEN
1 APU
1 EXT PWR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

If the battery voltages are below the minimum, how do you charge them?

A

Make sure BAT pb:s are on and switch the EXT PWR ON

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

When does the RAT automatically deploy?

A

Electrical power to both AC BUS 1&2 is lost and speed is above 100 kts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

What does the blue EXT PWR ON light mean?

A

External power is supplying the aircraft electrical systems

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

After IDG disconnection in flight, why do you get a GALLEY SHED indication on the SD?

A

It’s a reminder that the main galley has been shed automatically following the loss of one generator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

Where is the ground power connector?

A

Near the nosewheel on the right side of the fuselage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

What happens in case of a TR1 fault?

A

The conntactor of each TR opens automatically in case of overheat or minimum current. The other TR automatically replaces the faulty one. The ESS TR supplies the DC ESS BUS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

Having started the APU with EXT PWR connected, how can you get the APU to power the electrical system?

A

By pushing the EXT PWR pb and thus disconnecting the EXT PWR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

What powers the Emergency Generator?

A

The Blue HYD SYS via the RAT

37
Q

You enter a cold and dark cockpit, what action is required before you check the battery voltages

A

You have to check that both batteries are OFF

38
Q

What are the main functions of the Generator Control Unit (GCU)?

A

To control the frequency and the voltage output of the generators and protect the network by controlling the generator line contactors (GLC)

39
Q

Which bus supplies the AC ESS BUS?

A

Normally AC BUS 1 but it can be supplied by AC BUS 2 via the AC ESS FEED pb

40
Q

What is the capacity of the main batteries?

A

23 amp hours

41
Q

What is the power source for the FACDEC?

A

The FADEC has its own alternator. If it fails it automatically switches to aircraft electrical power

42
Q

When performing the preliminary flight deck preperation, what is the minmum battery voltage?

A

25,5 V

43
Q

What do you do if batteries are below 25,5 V?

A

Select BAT Switches ON with EXT PWR connected and ON

44
Q

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

A

No, Battery has cut-off logic at 22 VDC

45
Q

How is DC BAT BUS normally powered?

A

Through DC BUS 1 via a DC TIE conntactor

46
Q

What does a BAT FAULT light indicate?

A

Battery charging current is outside limits (BAT contactor opens)

47
Q

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

A

APU start
Battery charging
AC BUS 1&2 not powered and airspeed is above 100 kts

48
Q

What does the ON BAT light for the ADIRS indicate?

A

It’s illuminated amber if one or more IR:s is supplied by the aircraft battery.
It also comes on briefly during the beginning of a full alignment

49
Q

How are the IDG:s cooled?

A

By fuel from the HP fuel pump drawn in from the fuel manifold and then returned to it’s respective outer tank. When the outer tanks are full they spill over to the inner tanks

50
Q

If the IDG return fuel fills up the wing tanks, what occurs?

A

The Center Tank Pumps turn off until the wing tank quantity reduces by 1100 lbs

51
Q

What is the function of the IDG:s?

A

To convert variable engine speed to constant speed for optimum generator speed?

52
Q

What does the APU GEN FAULT light indicate?

A

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

53
Q

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

A
  • 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 and EXT PWR to the system
  • Inhibits multiple sources to be connected simultaneously
54
Q

How does the GALLEY pushbutton work in AUTO?

A

Sheds main galley and in-seat power if only 1 GEN (APU or ENG) is available in flight, OR only 1 ENG GEN is available on the ground

55
Q

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

A

To allow AC BUS 1 to power AC ESS BUS

56
Q

How is the AC ESS FEED transfered from AC BUS 1 to AC BUS 2?

A

Automatically or Manually by selecting ALTN on the AC ESS FEED pb

57
Q

What lights illuminates when the DC ESS SHED BUS fails?

A

Floor proximity emergency escape path markings
Overhead emergency lights
EXIT signs

58
Q

What buses are powered by the emergency generator?

A

AC ESS BUS and AC SHED BUS
DC ESS BUS and DC SHED via ESS TR

59
Q

What happens when you push the GEN LINE 1 pb?

A
  • GEN 1 Line Contactor opens and the white OFF light illuminates.
  • AC BUS 1 is powered by GEN 2 via the BUS TIE CONNTACTOR
  • GEN 1 continues to power 1 fuel pump in each wing
60
Q

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

A

At least one GEN:s load is above 100% rated power

61
Q

When is it normal to see the ENG GEN FAULT light illuminated?

A

Prior to engine start

62
Q

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

A

Normal AC power is lost and the emergency generator is not supplying power

63
Q

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

A

During 8 seconds at RAT deployment and power up

64
Q

Do pilots normally use the EMER GEN TEST pb?

A

No, maintenance function only

65
Q

When should you select the GEN 1 LINE pb?

A

During smoke procedures

66
Q

How long will it take to charge the batteries?

A

20 min

67
Q

What is the output of the static inverter?

A

1 kVa

68
Q

Is there more than one way to deploy the RAT?

A

Yes, RAT MAN ON from the HYD panel

69
Q

How would you manually force the aircraft into emergency electrical configuration?

A

Select EMER GEN 1 LINE OFF
Select EMER ELEC PWR to MAN ON
- when power is available
APU GEN OFF
GEN 2 OFF

70
Q

How would you know if the battery switch pb is in AUTO or OFF with no power connected to the aircraft?

A

The battery pb is slightly recessed and the green gear down lights are illuminated. Some cockpit lights are also available and can be an indicator

71
Q

How much (percentage wise) electrical power is shed in the smoke configuration?

A

75%

72
Q

What does the acronym GEAR-B stand for in regards to the electrical system?

A

Generator
EXT POWER
APU
RAT
BAT

73
Q

What are the limits for the electrical generator indications to turn amber with regards to LOAD, VOLTAGE and FREQUENCY?

A

LOAD > 100%
VOLTS < 110 V
> 120 V
FREQ < 390 Hz
> 410 Hz

74
Q

When will the IDG ECAM indication go from white to amber?

A
  • Outlet oil temp > 185 deg C
  • IDG is disconnected
  • Low oil pressure
  • Fault - engine running
  • Fault - engine stopped
75
Q

When will the AC ESS FEED pb FAULT light come on?

A

When the AC ESS BUS is not supplied with any power

76
Q

When will the AC ESS SHED BUS shed power?

A

When only battery power is available

77
Q

What does the TR:s in the electrical system accomplish?

A

Transforms 115 V AC power to 28 V DC power.

78
Q

What is the amperage that the TR:s can output?

A

200 amp

79
Q

What is the limits for the TR:s before the indications turn amber in regards to VOLTAGE and CURRENT?

A

VOLTAGE > 31 V
< 25 V
CURRENT Equal or less than 5A

80
Q

What does the BAT 1&2 pb,on the overhead panel, control?

A

The BCL:s (Battery Line Contactors)

81
Q

When will the BCL:s automatically connect the batteries to the DC BAT BUS?

A
  • For APU starting
  • Battery charging below 26.5 V
  • With loss of normal and emergency power below 100 kts
82
Q

When is the STATIC INVERTER activated?

A

If above 50 kts and only batteries are supplying power

83
Q

What is the primary source of power for the DC BAT BUS?

A

DC BUS 1 with DC BUS 2 as a backup

84
Q

What is the purpose of the DC BAT BUS?

A

To charge the batteries and supply power to the DC ESS BUS

85
Q

What normally supplies power to the DC ESS BUS?

A

The DC BAT BUS

86
Q

What is the back-up power sources for the DC ESS BUS?

A
  • ESS TR from the EMER GEN
  • BAT 2
87
Q

When will the DC SHED BUS shed power?

A

When the DC ESS BUS is supplied by BAT 2 only. This will happen when the EMER GEN is operating with the landing gear extended

88
Q

What does a voltage above 25.5 V ensure during the initial battery check?

A

That charge is above 50%

89
Q

For how long can the batteries supply power if they are the only power source?

A

Approximately 20 min

AIRBUS A320 (33 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions