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Mesa ERJ class 5/9/18 > Oral: Electrical Questions > Flashcards

Oral: Electrical Questions Flashcards

Know

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 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 reconnectedby 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 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 system‘s 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 AVAIL and 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 not 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 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 < 22.0 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 minimum airspeed for the RAT?

A
  • 130 KIAS.

* 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 (ICC)

* 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 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 CB’s can only be reset by maintenance

* SPDA CB’s can be reset via the MCDU

Mesa ERJ class 5/9/18 (31 decks)

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