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RJET E170/175 Official Study Guide 2016 > Electrical > Flashcards

Electrical Flashcards

1
Q

How many electrical networks are on the aircraft? Why?

A
  • 2 independent networks

- Redundancy

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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 IDG’s
  • APU
  • Inverter
  • RAT
  • AC GPU receptacle
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4
Q

What components power the D.C. System?

A
  • 2 nicad batteries
  • 3 TRUs
  • DC GPU receptacle
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5
Q

How does the IDG maintain a stable power output?

A

A constant speed drive attached to the accessory gear box

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6
Q

What monitors and controls the IDGs

A

Each has a generator control unit (GCU)

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7
Q

Can one IDG power 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, it’s a maintenance function

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10
Q

What is the primary purpose of the AC generators?

What buses and components are powered?

A
  • Powers AC BUS 1, 2 and AC ESS BUS which…

- Power TRU 1, 2, and ESS

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11
Q

What do the TRUs do?

A

Convert 115V AC to 28V DC

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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 system’s source priority?

A
  • Onside
  • Inside
  • Outside
  • Cross-side
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14
Q

How do you know if an AC GPU is connected and ready to provide electricity?

A
  • GPU button displays AVAIL and the GPU icon is presented on the electrical synoptic page
  • once GPU button is depressed it will display IN USE unless another AC Power source is available
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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 pushbutton before the next GPU connection

17
Q

What will charge BATT 1 and 2

A

Any AC power source

18
Q

How long will the batteries last with no recharging?

A

10 mins

19
Q

What is the purpose of the D.C. GPU receptacle?

A

If the battery temp is < -20C

20
Q

What is the min battery temp for APU start?

A

-20 C on BATT 2

21
Q

What is the min voltage to close the battery bus ties?

A

18 V

22
Q

How are the batteries used for APU start?

A
  • BATT 2 powers the APU start bus

- BATT 1 powers the APU FADEC and 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 RAT?

A

Airflow turns the RAT propeller which spins the turbine inside

26
Q

When will the RAT deploy?

A
  • Automatically deploys if AC BUS 1 and 2 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 D.C. ESS BUSSES and AC STANDBY BUS (via the inverter)

29
Q

What does the RAT POWER ?

A

The 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 ICC’s (Integrated Control Centers)

- 2 SPDA’s (secondary power distribution assemblies)

33
Q

What is an ICC?

A

An electronic 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 ICC’s, that distributes electrical loads to aircraft systems according to distribution logic

35
Q

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

A
  • ICC CBs can only be reset by maintenance on the ground

- SPDA CBs can be reset via the MCDU

RJET E170/175 Official Study Guide 2016 (17 decks)

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