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Embraer 190 Technical > Electrics > Flashcards

Electrics Flashcards

1
Q

What are the components of the AC Electrical System?

A

2 x IDGs
1 x APU
1 x RAT
1 x Static Inverter
1 x AC External Power Outlet (for GPU)

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2
Q

What is the main source of Electrical power?

A

The AC System

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3
Q

What is the purpose of the Electrical System?

A

To distribute both AC & DC power to the aircrafts systems

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4
Q

What is an IDG?

A

Integrated Drive Generator

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5
Q

What is the output of the IDGs?

A

40kVA, 115 VAC 400Hz, 3 Phase

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6
Q

How many IDGs are there?

A

2 - 1 per engine

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7
Q

What is the main AC Power Source when the engines are running?

A

IDG

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8
Q

How are the IDGs monitored and controlled?

A

By a dedicated GCU (Generator Control Unit)

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9
Q

Can an IDG be reconnected in flight?

A

No, disconnection is mechanical

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10
Q

When will the EICAS Message IDG 1(2) OIL display?

A

Oil Temp reaches 168°C +/- 5°C
Oil Pressure drops below 140psi +/- 25psi

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11
Q

What is the purpose of the Static Inverter?

A

Converts DC to AC Power

  • 28V DC (from the batteries) to 115 VAC power
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12
Q

When is the Static Inverter used?

A

Used to supply the AC STANDBY BUS when an AC power source is not available

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13
Q

What is the RAT?

A

RAM Air Turbine, installed in the nose of the aircraft

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14
Q

What is the power output of the RAT?

A

15kVA 115V AC 400Hz, 3 Phase

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15
Q

What is the purpose of the RAT?

A

Converts kinetic energy of airflow across the turbine into AC power in the event of an electrical emergency

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16
Q

When is the RAT automatically deployed?

A

When no other AC Power source is powering the AC Buses

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17
Q

After how long does the RAT supply power to the AC ESS BUS?

A

8 seconds

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18
Q

What is used as backup power to the AC ESS BUS during the 8 seconds before the RAT takes over?

A

Batteries - which are used to power the DC ESS BUS & AC STANDBY BUS

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19
Q

Can the RAT be restowed once normal power is established?

A

No

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20
Q

What is the altitude restriction for the RAT?

A

N/A - There isn’t one

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21
Q

What is the minimum IAS for RAT operation?

A

130kts

22
Q

What is NBPT?

A

No Break Power Transfer
- avoids electrical transient (preventing lights and equipment from flashing) by momentarily paralleling between 2 AC Power Sources

23
Q

How can the RAT be deployed if it does not deploy automatically?

A

A handle

24
Q

In an electrical emergency with the RAT failed, for how long will the batteries supply essential systems?

A

10 minutes

25
Q

What are the components of the DC Electrical System?

A

2 x NiCd Batteries
3 x TRUs
1 x DC External Power Outlet

26
Q

What is the purpose of the batteries?

A

To power up the airplane
To back up the DC ESS System (DC ESS Buses & AC STANDBY BUS)

27
Q

How are the batteries charged?

A

By any AC Source (Including the RAT)

28
Q

After how many minutes will a horn sound if the aircraft is powered only by batteries?

A

5 minutes

29
Q

Where is Battery voltage displayed?

A

MFD Status Page

30
Q

What indications will be seen when the battery temperature rises above 70°C for more than 2 seconds?

A

BATT 1(2) OVERTEMP EICAS Message
Associated Indication turns RED

31
Q

What is Electrical Source Priority Order?

A

Onside IDG
APU
GPU
Offside IDG

32
Q

What are the components of the Power Distribution and Control system?

A

4 x ICC (Integrated Control Centres)
2 x SPDAs (Secondary Power Distribution Assemblies)

33
Q

What can supply the AC Buses?

A

APU, GPU, Engines, RAT

34
Q

What happens when the IDG Knob is switched to OFF?

A

Generator Line Contractor Opens, Tripping off line and de-exciting the selected IDG

35
Q

What happens when the IDG Knob is selected to DISC?

A

If held for 1 second, the IDG is manually disconnected
DO NOT HOLD FOR MORE THAN 3 SECONDS

36
Q

How is IDG high oil temperature indicated?

A

Amber LED illuminated near the IDG Selector Knob

37
Q

When is the IDG automatically disconnected?

A

When oil temperature reaches 185.6°C and the IDG has not been manually disconnected

38
Q

What happens to BATT 2 during the APU Starting Cycle?

A

It is isolated from the network, powering the APU Start Bus EXCLUSIVELY

39
Q

Why does the RAT have a minimum speed?

A

To ensure that the RAT can continue to supply the AC/DC ESS Buses. At speeds below this, the RAT may only supply the AC BUS and the Batteries will need to automatically supply power to the DC ESS Buses and the Standby AC BUS via the Static Inverter

40
Q

What happens if the RAT Airspeed drops below 130kts?

A

Load Shedding Occurs and the AC ESS BUS is no longer powered
- Galley & Right Windshield Heating are Loss

41
Q

When is the Battery Voltage check NOT Valid?

A

When any AC Source is powering the aircraft - as TRU voltage is displayed, not battery

42
Q

What powers the APU Start Bus during Engine Start?

A

Battery 2

43
Q

How many TRUs are there?

A

3 - 1, 2 & ESS

44
Q

If 1 TRU Fails how are the BUSES powered?

A

By the remain ones, provided the DC BUS TIES Switch is in AUTO

45
Q

What does TRU 1 Power?

A

DC BUS 1, DC ESS BUS 1, DC GND SVC BUS, HOT BATT BUS 1 & BATT CHARGING 1

46
Q

What does TRU 2 Power?

A

DC BUS 2, DC ESS BUS 2, HOT BATT BUS 2, BATT CHARGING 2

47
Q

What does TRU ESS Power?

A

DC ESS BUS 3

48
Q

How many ICC are there and what are they comprised of?

A

4 - LEFT, RIGHT, EMERGENCY, AUXILLARY

  • Thermal Circuit Breakers
    Line Replaceable Units (LRUs)
    Line Replaceable modules (LRMs)
    AC/DC Buses
49
Q

What are the 2 types of Circuit Breakers?

A

Thermal & Electric

50
Q

How can pilots monitor the remote CBs in the cockpit?

A

Via the MCDU CB Page

51
Q

What Systems are connected to the MAUs?

A

Those requiring a complex logic for normal operation

52
Q

What does the AVAIL Light on the Overhead Panel mean?

A

The AC GPU is connected to the aircraft and the power quality requirements (Voltage, Amperage and Frequency) are within the accepted limits

Embraer 190 Technical (20 decks)

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