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E175 Electrical Flashcards

1
Q

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

A
  • 2 independent networks

- Redundancy and fault isolation

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2
Q

What happens if 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 do IDG maintain a stable power output?

A

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

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6
Q

What monitors and controls the IDG?

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 overhead panel to illuminate?

A
  • high oil temp

- low oil pressure

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9
Q

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

A

No. This is a maintenance function

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10
Q

What is the primary purpose of AC generators?

A
  • to power the AC BUSSES and AC ESS BUS which…

- power the 3 TRU (1,2 & ESS)

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11
Q

What is the purpose of the TRUs?

A

To convert 115 VAC 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 systems priority?

A
  • (onside) 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 AVAILand the GPU icon is presented on the electrical synoptic page
  • Once the GPU button is pushed in, the button will display IN USEprovided another AC power source is notavailable.
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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 AVAILeven though the ground service bus is in use

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16
Q

If the airplane is using the AC GPU and the APUis 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 batteries < 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 notavailable

24
Q

What is on theAC 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 minimum airspeed for the RAT?

A
  • 130 KIAS.

- Load shedding occurs below this speed

31
Q

What manages the electrical system?

A
  • 4 Integrated Control Centers (ICC)

- 2 Secondary Power DistributionAssemblies (SPDA)

32
Q

What is an ICC?

A

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

33
Q

What is an SPDA?

A

An electrical load-management unit (powered by the ICC’s) that distributes electrical loads to aircraft systemsaccording to distribution logic

34
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

35
Q

IDG Output

A
  • 115 V
  • 400 HZ
  • 40 KVA
  • 3 Phase
36
Q

DC GPU used when?

A
  • BATT 1 & 2 less than 22 V

- BATT 1 & 2 -20C

37
Q

AC GPU AVAL/IN USE OUTSIDE

A

Powers AC GND SVC and DC GND SVC

38
Q

What is powered on BATT power

A
  • Screen 2 & 3
  • IESS, Clock
  • CAPT CCD
  • COM Panels
  • Light for Magnetic Compass
  • FO MCDU
  • CAPT display control panel

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