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E175 > Electrical > Flashcards

Electrical Flashcards

1
Q

What are the AC power sources listed in the EPC?

A

2 IDGs (Integrated Drive Generators), 1 APU Generator, 1 ACGPU (Ground Power Unit), 1 RAT (Ram Air Turbine), 1 Inverter.

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2
Q

What is the power output of the IDGs?

A

T15VAC, 400Hz, 40KVA.

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3
Q

What is the power output of the APU Generator?

A

115VAC, 400Hz, 40KVA.

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4
Q

What is the power output of the ACGPU?

A

115VAC, 400Hz, 40KVA.

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5
Q

What is the power output of the RAT?

A

115VAC, 400Hz, 15 KVA.

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6
Q

What is the voltage of the Inverter?

A

250V.

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7
Q

Can one IDG power both AC buses?

A

Yes, one IDG can power both AC buses on ground and in flight.

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8
Q

Can the APU power both AC buses?

A

Yes, the APU can power both AC buses on ground and in flight up to FL330.

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9
Q

Can the GPU power both AC buses?

A

Yes, the GPU can power both AC buses.

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10
Q

What is the primary AC power source?

A

IDGs (Integrated Drive Generators).

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11
Q

What is the function of the AUTO setting on an IDG?

A

System logic controls contactor.

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12
Q

What happens when the IDG is set to OFF?

A

Opens contactor.

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13
Q

What does DISC do on an IDG?

A

Mechanically disconnects the CSD (Constant Speed Drive) from the IDG.

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14
Q

Who can reconnect the IDG?

A

Flight crew cannot reconnect the IDG; it is a maintenance function only.

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15
Q

What does an amber light with an EICAS oil message indicate?

A

IDG disconnect is required.

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16
Q

What is the secondary AC power source?

A

APU (Auxiliary Power Unit).

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17
Q

What is required for ARU start?

A

DC PU are required for ARU start.

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18
Q

What is the minimum voltage required to close the battery contactor?

A

18.0 VDO.

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19
Q

What is the minimum BATT 2 temperature for start?

A

-20°C.

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20
Q

What is the AC GPU?

A

The AC GPU (Ground Power Unit) is a secondary AC power source.

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21
Q

How can the AC GPU be turned ON?

A

The AC GPU can be turned ON via three different buttons: one on the AC GPU panel, one opposite the FWD lav, and one in the cockpit on the overhead panel.

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22
Q

What happens when the parking brake is released with the AC or DC GPU connected?

A

A CAS message (GPU CONNECTED), Master Caution flasher, and an aural warning will occur.

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23
Q

What does the AVAIL indication mean?

A

AVAIL indicates that the GPU is properly connected and power requirements are satisfied.

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24
Q

What does the IN USE indication mean?

A

IN USE means that the GPU is powering the AC system.

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25
Q

What is the normal AC electrical priority order?

A

The normal AC electrical priority is: Onside (IDG), Inside (APU), Outside (GPU), Cross-Side (Other IDG).

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26
Q

What is the function of the inverter?

A

The inverter powers the AC STANDBY BUS when the normal AC power source is not available.

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27
Q

What is the RAT?

A

The RAT (Ram Air Turbine) is an emergency AC power source.

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28
Q

What are the deployment conditions for the RAT?

A

The RAT has no altitude or airspeed restriction for deployment and automatically deploys if both AC buses lose power during flight.

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29
Q

What happens during RAT deployment?

A

During deployment (approximately 8 secs), the aircraft’s batteries provide power.

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30
Q

What is the minimum airspeed required for RAT to provide power?

A

A minimum of 130 knots airspeed is required.

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31
Q

What happens below 130 knots with the RAT?

A

Below 130 knots, the RAT will provide power only to AC ESS, while batteries will provide power to DC ESS and AC STANDBY.

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32
Q

What is the DC electrical power configuration?

A

The DC electrical power configuration includes 13 TRUs (Transformer Rectifier Units), 2 Batteries, and 1 DC GPU.

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33
Q

What is the function of TRUs?

A

TRUs are the primary DC power source that converts 115VAC into 28VDC.

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34
Q

How do TRUs operate?

A

Each TRU works in isolation from the other.

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35
Q

What type of power source are batteries considered?

A

Secondary DC power source

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36
Q

How many NiCad batteries are used?

A

2 NiCad batteries

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37
Q

What is the purpose of the batteries?

A

Back-up for DC ESS

38
Q

How are the batteries charged?

A

Charged via any AC power source through the TRUs

39
Q

What is the minimum voltage required to close the battery contactor?

A

18.0 volts minimum required to close the battery contactor

40
Q

How long will the batteries provide power during an electrical emergency?

A

Will provide 10 minutes of power during an electrical emergency

41
Q

What does the DC GPU do?

A

Hooks directly to the APU start bus and replaces BATT 2 during APU start

42
Q

How can the DC GPU be turned on?

A

Can only be turned on by a ground ramp button

43
Q

Can the DC GPU charge BATT 2?

A

Cannot charge BATT 2

44
Q

What is the ICC?

A

Integrated Control Center

45
Q

How many ICCs are installed?

A

4 (Installed in various Electronics Bays)

46
Q

What is a characteristic of the ICC?

A

Line-replaceable (plug-n-play like a computer’s motherboard)

47
Q

What are SPDAs?

A

Secondary Power Distribution Assemblies

48
Q

What is the function of the SPDAs?

A

An electrical load management unit

49
Q

Where do SPDAs receive power from?

A

Receives power from ICCs

50
Q

What do SPDAs do with the power?

A

Distributes power according to system logic

51
Q

What do SPDAs perform on many items?

A

Performs BITs on many items

52
Q

In simple terms, what do ICCs and SPDAs do?

A

The ICCs collect and confirm the power is safe and then sends it to the SPDAs, which distributes it.

53
Q

What are the items on the Hot Battery Bus?

A

DC HOT BUS 1 and DC HOT BUS 2

54
Q

What are the 6 things on DC Hot Bus 1?

A

Engine 1A/2A Fire Extinguisher
Engine fuel shutoff valve 1
Hydraulic shutoff valve 1
Engine 1 oil level indication
Courtesy/service lights
DC ceiling lights

55
Q

What are the 7 things on DC Hot bus 2?

A

Engine 1b/2b fire extinguisher
Engine fuel shutoff valve 2
Hydraulic shutoff valve 2
Engine 2 oil level indication
CMC
Panel refuel
Water and waste system

56
Q

How many networks make up the electrical system on the airplane?

A

2 independent networks

Redundancy and fault isolation

57
Q

What happens if a power generating source fails?

A

Bus ties automatically connect to provide no system degradation.

58
Q

What components power the AC system?

A

2 Integrated Drive Generators (IDG), Auxiliary Power Unit (APU), Inverter, Ram Air Turbine (RAT), AC GPU receptacle.

59
Q

What components power the DC system?

A

2 Nicad batteries, 3 Transformer Rectifier Units (TRU), DO GPU receptacle.

60
Q

How does the IDG maintain a stable power output?

A

A Constant Speed Drive (CSD) attaches the IDG to the AGB (Accessory Gear Box).

61
Q

What monitors and controls the IDG’s?

A

Each has a Generator Control Unit (GCU).

62
Q

Can one IDG supply the entire electrical system?

A

Yes.

63
Q

What will cause the amber IDG light on the overhead panel to illuminate?

A

High oil temperature, Low oil pressure.

64
Q

If an IDG is manually disconnected can it be reconnected by the flight crew?

A

No. This is a maintenance function.

65
Q

What is the primary purpose of the AC generators?

A

To power the AC BUSES and AC ESS BUS which…

Power the 3 Transformer Rectifier Units (TRU) 1, 2, and ESS.

66
Q

What is the purpose of the Transformer Rectifier Units?

A

To convert 115 VAC to 28 VDC.

67
Q

Can the APU replace a failed IDG?

A

Yes.

68
Q

What is the AC electrical system’s priority?

A

Onside (IDG), Inside (APU), Outside (GPU), Cross-Side (Other IDG).

69
Q

How is it known that an AC GPU is hooked up to the airplane and ready to provide electricity?

A

GPU button displays AVAIL and the GPU icon is presented on the electrical synoptic page.

70
Q

What does it mean if the AC GPU is plugged in and the outside GPU panel button displays IN USE?

A

Ground service bus is in use.

Cockpit GPU button will display AVAIL even though the ground service bus is in use.

71
Q

If the airplane is using the AC GPU and the APU is started, what should the pilot be sure to do?

A

Deselect the GPU button before the next GPU connection.

72
Q

What will charge the batteries?

A

Any AC Power Source.

73
Q

How long will the aircraft’s batteries last with no recharging?

A

10 minutes.

74
Q

What is the purpose of the DC GPU receptacle?

A

For APU start when batteries < 22.0 VDC, or if battery temp is < -20°C.

75
Q

What is the minimum battery temp for APU start?

A

-20 C.

76
Q

What is the minimum battery voltage to close the battery bus-ties?

A

18 volts.

77
Q

What battery is used for the APU start?

A

BATT 2 powers the APU Start Bus.

BATT 1 powers the FADEC & EICAS for monitoring.

78
Q

What is the purpose of the Inverter?

A

Converts 28 VDC from the batteries to 115 VAC to power the AC STANDBY BUS when an AC source is not available.

79
Q

What is on the AC STANDBY BUS?

A

Engine exciters 14 and 24.

80
Q

What powers the Ram Air Turbine (RAT)?

A

Airflow turns the RAT propeller which spins the turbine inside.

81
Q

When will the RAT deploy?

A

Automatically deploys if AC BUSES are not powered or manually by pilot.

82
Q

How long after deployment before the RAT will supply power?

A

6 seconds.

83
Q

Is there a total loss of power during the 8 second RAT deployment?

A

No. Batteries supply power to the DC ESS BUSES and AC STANDBY BUS.

84
Q

What does the RAT power?

A

ESS BUSES.

85
Q

What is minimum airspeed for the RAT?

A

130 KIAS.

Load shedding occurs below this speed.

86
Q

When is the RAT icon displayed on the electrical synoptic page?

A

When the RAT is deployed.

87
Q

What manages the electrical system?

A

4 Integrated Control Centers (ICC) and 2 Secondary Power Distribution Assemblies (SPDA).

88
Q

What is an 1007?

A

An electrical control device, which provides power distribution and protection for electrical loads.

89
Q

What is an SPDA?

A

An electrical load-management unit (powered by the ICCs) that distributes electrical loads to aircraft systems according to distribution logic and performs BITs on many components.

90
Q

Can the flight crew reset the ICC and SPDA remote electronic CBs?

A

• ICC CB’s can only be reset by maintenance.
• SPDA CB’s can be reset via the MCDU.

E175 (8 decks)

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