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E170/175 ASM > Electrical > Flashcards

Electrical Flashcards

1
Q

The sources of AC power include:

A

Two Integrated Drive Generators (IDGs), an APU driven generator, a Ram Air Turbine (RAT) and an external AC Ground Power Unit (AC GPU)

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2
Q

Once mechanically disconnected, an IDG cannot be reconnected in flight.
(T or F)

A

True

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3
Q

The APU generator:

A

Can power the entire electrical system by itself.

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4
Q

In the event of a loss of AC power, the Ram Air Turbine (RAT) MUST be manually deployed using the RAT MANUAL DEPLOY handle.
(T or F)

A

False

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5
Q

Under normal operating conditions, DC power is provided by _ Transformer Rectifier Units and _ batteries.

A

3, 2

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6
Q

On battery power only, batteries will supply essential loads for how long?

A

10 minutes

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7
Q

Under what circumstances would we use a DC GPU?

A

If Battery 2 where not available for APU start.

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8
Q

System logic provides electrical power for the aircraft according to the following source priority:

A

Respective IDG, APU generator, AC GPU, Opposite IDG

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9
Q

Two independent networks provide complete segregation for electrical fault isolation purposes.
(T or F)

A

True

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10
Q

Which AC source has priority, the APU or GPU?

A

When the APU is started, the system logic will automatically isolate the GPU from the AC BUS TIE

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11
Q

You receive the aircraft at the gate and it is powered by the AC GPU. You start the APU. Once
it is up and running, how can you tell that the APU generator has automatically taken over the
electrical load?

A

AVAIL light on the GPU button, and MFD electrical page shows a green APU icon

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12
Q

During “normal operation”, will a failed IDG de-power the respective AC BUS?

A

No

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13
Q

How many Display Units (DUs) power on when you turn the batteries on and which ones are they?

A

2 DUs; DU 2 and DU 3

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14
Q

Can one IDG supply the entire electrical system?

A

Yes

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15
Q

What are the two amber LEDs near the IDG knobs?

A

IDG fault isolation LEDs (associated with the EICAS message IDG 1 (2) OIL) that indicate which IDG must be disconnected.

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16
Q

When would the amber IDG oil indicator light illuminate?

A

High oil temperature, Low oil pressure and annunciator test button

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17
Q

What action is taken when an amber IDG oil indicator light comes on?

A

Disconnect the associated IDG per the QRH

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18
Q

If an IDG is mechanically disconnected can the flight crew reconnect it on the ground or in flight?

A

No

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19
Q

What is the primary purpose of the IDGs?

A

Supply AC power during all operations

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20
Q

What is a TRU?

A

Transformer Rectifier Unit

21
Q

What is the purpose of the Transformer Rectifier Units?

A

Converts AC power to DC power.

22
Q

What is the purpose of the Inverter?

A

Converts DC power to AC power

23
Q

Can the APU fully replace a failed IDG?

A

Yes

24
Q

Does the APU generator have the same rating as the IDGs?

A

Yes; 115 VAC, 40kVA, 400 Hz, 3-phase

25
Q

At the gate, ground power is connected. What does it mean when the switch says AVAIL?

A

It means the voltage, amperage and frequency are within limits

26
Q

How would you know that an AC GPU is hooked up to the aircraft and ready to provide electricity?

A

GPU button displays AVAIL and the GPU icon is presented on the electrical synoptic page

27
Q

With AVAIL displayed on the GPU button, what happens when the GPU button is pushed in?

A

The GPU button will display IN USE and connects the AC GPU to the AC BUS TIE according to system priority.

28
Q

If the aircraft is using the AC GPU and the APU is started what should the pilot be sure to do?

A

Deselect the AC GPU button so the GPU power can be connected next time

29
Q

What happens with the BATT 1 selector OFF?

A

Battery 1 supplies power to the HOT BATT BUS 1 only and is no longer connected to the airplane electrical system

30
Q

What will charge BATT 1 and BATT 2?

A

Any AC power source

31
Q

When is the HOT BATTERY BUS powered?

A

The HOT BATTERY BUS is always powered.

32
Q

What are some items on the HOT BATTERY BUSES?

A
  1. Engine fire extinguisher
  2. Engine Fuel SOV
  3. Hydraulic Sys SOV
  4. Engine oil level indication
  5. Refueling panel
  6. Water and Waste system
  7. CMC (Central Maintenance Computer)
33
Q

What happens with the BATT 2 selector OFF?

A

Battery 2 supplies power to the HOT BATT BUS 2 only and is no longer connected to the airplane electrical system

34
Q

How many batteries are required for normal APU start?

A

2

35
Q

How is Battery 1 used for APU start?

A

It powers the APU FADEC and EICAS (for monitoring)

36
Q

How is Battery 2 used for APU start?

A

Powers the APU start bus

37
Q

Why does Battery 1 have ON but no AUTO setting?

A

Battery 1 does not require automation for APU start

38
Q

Why does Battery 2 have an AUTO position?

A

To allow it to power the APU START bus.

39
Q

What is the purpose of the DC Ground power?

A

To start the APU when Battery 2 is unavailable

40
Q

Can the DC GPU charge the batteries?

A

No.

41
Q

When will the RAT deploy?

A

Whenever AC power sources are not powering the AC buses AND when the RAT deployment handle is pulled.

42
Q

Will the RAT supply power immediately after automatic deployment?

A

No, there is an 8 second delay. To avoid total loss of power during this 8 seconds period, batteries are used as backup to power the DC ESS BUSES and the STANDBY AC BUS

43
Q

Are the power ratings the same for the APU, IDG and RAT?

A

No, the RAT provides a lower power output

44
Q

The RAT icon is only displayed on the electrical synoptic page when it is deployed.

A

True

45
Q

Can the remote electronic CBs in the forward electronics bay be monitored?

A

Yes, using the MCDU

46
Q

If an engine is started at the gate with the GPU IN USE, is the electrical system split?

A

Yes.

47
Q

What is available during an electrical emergency?

A

DU 2 and DU 3, guidance panel, CCD 1, MCDU 2, audio control panels and clock, IESS, compass backlight

48
Q

Whenever the electrical load increases beyond the system limit what happens?

A

Load sheds galleys and the right windshield heating

E170/175 ASM (5 decks)

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