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Republic Airlines > Electrical System > Flashcards

Electrical System Flashcards

1
Q

How many networks make up the electrical system on the aircraft? Why?

A
  • 2 independent networks

* Segregation and fault isolation

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2
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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3
Q

What components power the DC system?

A
  • 2 NiCad batteries
  • 3 Transformer Rectifier Units (TRU)
  • DC GPU receptacle
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4
Q

What is the AC electrical systems priority?

A
  • On-side (Respective IDG)
  • Inside (APU generator)
  • Outside (GPU if on the ground)
  • Cross-Side (Opposite IDG)
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5
Q

Which AC source has priority, the APU or GPU?

A

APU has priority and will automatically switch when the APU is up and running.

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6
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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7
Q

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

A

No.

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8
Q

How many Display Units (DUs) come to life when you bring the batteries online? Which
ones are they?

A

2, DU 2 & DU 3

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9
Q

Can one IDG supply the entire electrical system?

A

Yes.

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10
Q

What are the two lights next to the IDGs?

A

Tells you which IDG must be disconnected and it’s associated with an EICAS message.

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11
Q

When would the amber IDG oil indicator light illuminate?

A
  • High Oil Temperature, Low Oil Pressure (HOTLOP), or

* Annunciator test button

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12
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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13
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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14
Q

What is the primary purpose of the IDGs?

A

Supply AC power during all operations.

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15
Q

What is a TRU?

A

Transformer Rectifier Unit

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16
Q

What is the purpose of the Transformer Rectifier Units?

A

To convert AC to DC.

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17
Q

TRU transforms AC to DC, is there a way to change DC to AC?

A

Inverter

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18
Q

What is the purpose of the inverter?

A

Converts DC to AC.

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19
Q

Can the APU fully replace a failed IDG?

A

Yes.

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20
Q

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

21
Q

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

A

Voltage/Amperage/Frequency are within limits.

22
Q

How is it known that an AC GPU is hooked up to the aircraft and ready to provide
electricity?

A

• GPU buttons display AVAIL and the GPU icon is presented on the electrical synoptic page.
• Once the GPU button is pushed in, the button will display IN USE. Connects the AC GPU to
the AC BUS TIE according to source priority.

23
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 AC GPU button so the power can be connected the next time it is used.

24
Q

What happens with the BATT 1 selector ON or OFF?

A
  • ON: The battery is connected to the DC ESS BUS 1.

* OFF: The battery supplies power to HOT BATT BUS 1.

25
Q

What will charge BATT 1 and BATT 2?

A

Any AC power source.

26
Q

In which BATT switch position are the HOT BATTERY BUSSES powered?

A

The HOT BATTERY BUSSES are always powered regardless of the switch position.

27
Q

Name a few items on the HOT BATT BUSE 1?

A 
Engine Fire Extinguisher 1A & 2A
Fuel Shutoff Valve 1
Hydraulic Shutoff Valve 1
Engine 1 Oil Level Indication
Courtesy/Service Lights FWD
DC Ceiling Lights
28
Q

Name a few items on the HOT BATT BUS 2?

A 
Engine Fire Extinguisher 1B & 2B
Fuel Shutoff Valve 2
Hydraulic Shutoff Valve 2
Engine 2 Oil Level Indication
Refueling Panel
Water & Waste System
CMC
29
Q

What happens when BATT 2 switch is OFF?

A

OFF: The battery supplies power to the HOT BATT BUS 2.

30
Q

Below what voltage would you have to call maintenance?

31
Q

Below what voltage must the batteries be charged?

A

22.0 volts. Reference the SOP for appropriate charging time

32
Q

How many batteries are required for APU start? How are they used?

A
  • 2
  • BATT 2 powers the APU Start Bus.
  • BATT 1 powers the APU FADEC & EICAS for monitoring.
33
Q

Is BATT 1 necessary to start the APU?

A

Yes, BATT 1 powers the APU FADEC.

34
Q

Why does battery 1 have ON but no AUTO setting?

A

Battery 1 does not require automation during APU start.

35
Q

Why does battery 2 have an AUTO setting?

A

To allow it to power the APU START BUS

36
Q

What is the purpose of the DC GPU receptacle?

A

For APU start when the battery is no longer available

37
Q

What is the purpose of the DC GPU receptacle?

A

For APU start when the battery is no longer available

38
Q

Can the DC GPU charge the batteries?

39
Q

When will the RAT deploy?

A
  • Automatically deploys if AC BUSES are not powered.

* Manually by Pilot (RAT manual deploy handle).

40
Q

Is there an altitude restriction for operation of the RAT?

41
Q

Will the RAT supply power immediately after automatic deployment?

A

No, there is an 8 second delay during which time the batteries supply power.

42
Q

Is there a total power loss during the 8 seconds while the RAT deploys?

A

No, the batteries supply power.

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

When is the RAT icon displayed on the electrical synoptic page?

A

When the RAT is deployed.

45
Q

Can the remote electronic CBs in the forward E-bay be monitored?

A

Yes, via the MCDU.

46
Q

If you start an engine at the gate with the GPU, is the electrical system split? Why?

A
  • Yes.

* IDG will power one side and GPU will power the other.

47
Q

During an electrical emergency how long will the batteries last if the RAT doesn’t
deploy?

A

10 minutes

48
Q

What is available during an electrical emergency (batteries on during power-up)?

A
  • DU 2 & 3
  • Guidance Panel
  • CCD 1
  • MCDU 2
  • Clock
  • IESS
  • Audio Control Panels
  • Compass backlight
49
Q

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

A

• Load sheds galleys and the right windshield heating.

Republic Airlines (5 decks)

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