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E170 > Study Guide Electrical > Flashcards

Study Guide Electrical Flashcards

1
Q

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

A
  • 2 Independant networks

- Redundancy and fault isolation

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2
Q

What Happens is a power generating source fails?

A
  • Bus ties automatically connect to provide no system degradation.
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3
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
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4
Q

What components power the DC system?

A
  • 2 NiCad batteries
  • 3 Transformer Rectifier Units (TRU)
  • DC GPU receptacle
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5
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)

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6
Q

What monitors and controls the IDG’s?

A

Each has a Generator Control Unit (GCU)

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7
Q

Can one IDG supply the entire electrical system?

A

Yes

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8
Q

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

A
  • High oil temperature

- Low oil pressure

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9
Q

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

A

No. This is a maintenance function.

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10
Q

What is the primary purpose of the AC generators?

A
  • To power the AC BUSSES and AC ESS BUS which…..

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

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11
Q

What is the purpose of the Transformer Rectifier Units?

A

To convert 115 AC to 28 VDC

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12
Q

Can the APU replace a failed IDG?

A

Yes

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13
Q

What is the AC electrical system’s priority?

A
  • On Side (IDG)
  • Inside (APU)
  • Outside (GPU)
  • Cross-Side (other IDG)
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14
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.

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15
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

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16
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.

17
Q

What will charge the batteries?

A

Any AC power source.

18
Q

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

A

10 minutes

19
Q

What is the purpose of the DC GPU receptacle?

A
  • For APU start when the batteries are < 22.5 VDC or

- If battery temp is < -20 C

20
Q

What is the minimum battery temp for APU start?

A

-20 C

21
Q

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

A

18 volts

22
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

23
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

24
Q

What is on the AC STANDBY BUS?

A

Engine exciters 1A and 2A

25
Q

What powers the Ram Air Turbine (RAT)?

A

Airflow turns the RAT propeller which spins the turbine inside.

26
Q

When will the RAT deploy?

A
  • Automatically deploys if AC BUSSES are not powered.

- Manually by pilot

27
Q

How long after deployment before the RAT will supply power?

A

8 seconds

28
Q

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

A

No. batteries supply power to the DC ESS BUSSES and AC STANDBY BUS

29
Q

What does the RAT power?

A

ESS BUSSES

30
Q

What is the minimum airspeed for the RAT?

A
  • 130 KTS

- Load Shedding occurs below this speed

31
Q

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

A

When the RAT is deployed

32
Q

What manages the electrical system?

A
  • 4 Integrated Control Centers

- 2 Secondary Power Distribution Assemblies (SPDA)

33
Q

What is an ICC?

A

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

34
Q

What is an SPDA?

A

An electrical load-management unit (powered by the ICCs) that distributes electrical loads to the aircraft systems according to distribution logic.

35
Q

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

A
  • ICC CB’s can only be reset by maintenance on the ground.

- SPDA CB’s can be reset via the MCDU

E170 (15 decks)

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