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E175 Electrical Flashcards

(38 cards)

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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?

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A

Deselect the GPU button before the next GPU connection

17
Q

What will charge the batteries?

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A

Any AC Power Source

18
Q

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

19
Q

What is the purpose of the DC GPU receptacle?

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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?

21
Q

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

22
Q

What battery is used for the APU start?

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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?

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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?

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A

Engine exciters 1A and 2A

25
What powers the Ram Air Turbine (RAT)?
Airflow turns the RAT propeller which spins the turbine inside
26
When will the RAT deploy?
- Automatically deploys if AC BUSSES are not powered | - Manually by pilot
27
How long after deployment before the RAT will supply power?
8 seconds
28
Is there a total loss of power during the 8 second RAT deployment?
No. Batteries supply power to the DC ESS BUSSES and AC STANDBY BUS
29
What does the RAT power?
ESS BUSSES
30
What is minimum airspeed for the RAT?
- 130 KIAS. | - Load shedding occurs below this speed
31
What manages the electrical system?
- 4 Integrated Control Centers (ICC) | - 2 Secondary Power DistributionAssemblies (SPDA)
32
What is an ICC?
An electrical control device, which provides power distribution and protection for electrical loads
33
What is an SPDA?
An electrical load-management unit (powered by the ICC’s) that distributes electrical loads to aircraft systemsaccording to distribution logic
34
Can the flight crew reset the ICC and SPDA remote electronic CBs?
- ICC CB’s can only be reset by maintenance | - SPDA CB’s can be reset via the MCDU
35
IDG Output
- 115 V - 400 HZ - 40 KVA - 3 Phase
36
DC GPU used when?
- BATT 1 & 2 less than 22 V | - BATT 1 & 2 -20C
37
AC GPU AVAL/IN USE OUTSIDE
Powers AC GND SVC and DC GND SVC
38
What is powered on BATT power
- Screen 2 & 3 - IESS, Clock - CAPT CCD - COM Panels - Light for Magnetic Compass - FO MCDU - CAPT display control panel
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