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E jet > Electrical Questions > Flashcards

Electrical Questions 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 powers the AC system?

A

1) 2 IDGs
2) APU
3) Inverter
4) Ram Air Turbine (RAT)
5) AC GPU receptacle

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4
Q

What components power the DC system?

A

1) 2 NiCad Batteries
2) 3 TRU’s
3) 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 IDGs?

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 on the overhead panel to illuminate?

A

High Oil Temp

Low Oil Pressure

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9
Q

If an IDG is manually disconnected, can the flight crew reconnect it?

A

No. MX function on the ground

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10
Q

What is the primary purpose of the AC Generators?

A

To power the AC busses and the AC ESS BUS which…

Power the 3 TRU’s, 1,2, and ESS

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11
Q

what is the purpose of the TRU’s?

A

To convert 115VAC to 28 VDC

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12
Q

Can the APU replace a failed IDG?

A

Yes up to 33,000ft

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13
Q

What is the AC electrical systems priority?

A 
Onside (IDG)
Inside (APU)
Outside (GPU)
Cross side (other IDG)
***the airplane uses an onboard AC power source beofre an external AC source
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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 Syn Page
  • Once the GPU button is pushed in, the button will display IN USE provided 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

17
Q

What will charge the batteries?

A

Any AC Power source

18
Q

How long will the aircrafts 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

20
Q

What is the Min 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 for the inverter?

A

Converts 28 VDC from the batteries to 115 VAC to power the AC STANDBY BUS whan an AC souce is not available

24
Q

What is on the AC STANDBY BUS?

A

Engine Igniters 1A and 2A

25
Q

What powers the Ram Air Turbine (RAT)?

A

Airflow turns the RAT prop which spins the turbine inside

26
Q

When will the RAT deploy?

A
  • Automatically deploys if AC BUSSES are not powered

- Manually by the pilot

27
Q

How long after deployment before the RAT will supply power?

A

8 Seconds

28
Q

Is there is 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 Min airspeed for the RAT?

A
  • 130 kts

- Load shedding occurs below this speed

31
Q

When is the RAT icon displayed on the Electrical Syn 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 a 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 CB’s?

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

- SPDA CB’s can be reset via the MCDU

E jet (22 decks)

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