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787 Technical Questions > 06 Electrics > Flashcards

06 Electrics Flashcards

1
Q

What is initiated by selecting the Battery switch to ON?

A

The L CCR start-up sequence

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2
Q

In the Generator Control (GEN CTRL) switch, what does the amber OFF light indicate?

A

The generator breaker is open

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3
Q

In the external power switches: -

a. What does the AVAIL light indicate?
b. What doest he ON light indicate?

A

a. External power is plugged in and power quality is acceptable
b. External power is selected ON

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4
Q

With an engine running, what is indicated when the generator DRIVE light illuminates?

A

A generator drive malfunction has occurred

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5
Q

In addition to traditional electrically powered systems, what other systems are electrically powered?

A
  • Engine start
  • Pressurization
  • Wing ice protection
  • Stabilizer trim
  • Wheel brake systems
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6
Q

How many engine driven generators are there to power the main AC buses?

A

Four variable frequency engine starter/generators

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7
Q

What other aircraft power source for the main AC buses is available in flight?

A

Two variable frequency APU starter/generators

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8
Q

What AC power sources are available on the ground before engine start?

A

Three external AC power receptacles as well as the two APU generators

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9
Q

Can any of these AC power sources normally be connected to run together?

A

No

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10
Q

What electrical sources can be used for engine start?

A
  • External A/C power
  • APU generated power
  • The opposite engine’s generated power
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11
Q

What electrical sources can be used for APU start?

A

Forward external power, APU battery, or engine generated power

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12
Q

On the ground, how many APU generators are available to power the main AC buses?

A

Both

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13
Q

If the APU is not available, how many external power sources are required for optimal engine start performance?

A

Three, both forward and one aft receptacle

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14
Q

How many primary batteries does the aircraft have?

A

Two, the Main and APU batteries

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15
Q

Can the Main battery be used to start the APU?

A

Yes, it assists the APU battery

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16
Q

What are the primary sources of power for the flight control electronics?

A

Three engine driven Permanent Magnet Generators (PMGs)

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17
Q

If PMG power is lost, what secondary sources of flight control power are available?

A

The 28Vdc bus distribution system, and the main battery

18
Q

How are higher amperage loads distributed throughout the airplane’s electrical system?

A

They are distributed directly by the bus systems which are located in the forward & aft E/E bays (Primary)

19
Q

How are lower amperage loads distributed throughout the airplane’s electrical system?

A

Via Remote Power Distribution Units (RPDUs) located throughout the airplane (Remote)

20
Q

What is the purpose of the power conversion devices?

A

They change power from one voltage or current type (AC/DC) to another

21
Q

How many main AC buses are there?

A

Four 235v AC buses, designated L1, L2, R1 & R2

22
Q

What do the main AC buses provide power to directly?

A

A limited number of high voltage AC systems

23
Q

How do the main AC buses provide power to other (lower voltage) bus systems?

A

Through power conversion devices

24
Q

On the ground, with only forward external power selected ON, how are the main AC buses powered?

A

Via the 115v AC bus distribution system through the power conversion devices

25
Q

With both engines running, if an engine generator is not available, how is its respective main AC bus powered?

A

By another main AC bus

26
Q

In flight, what is the primary power source for the 115v AC and 28v DC buses?

A

The main AC buses through the power conversion devices

27
Q

Which units condition variable frequency power to energize the large motor loads?

A

Motor controllers

28
Q

Which system energizes these motor controllers?

A

The Large Motor Power System (LMPS) located in the aft E/E bay

29
Q

List the large motor loads theses motor controllers convert power for?

A
  • Hydraulic Pumps
  • Cabin Air Compressors - Ram Fans
  • Engine & APU Start
  • Center Tank Fuel Pumps
  • Nitrogen Generation System
30
Q

What system provides flight deck control/indication, power transfer functions, electrical load management and protection?

A

The Bus Power Control Unit (BPCU)

31
Q

How many of these units does the aircraft have?

A

Two

32
Q

When is Ground Handling mode active?

A

When the first forward external power receptacle is connected (not selected ON) and there are no other power sources

33
Q

How is the Ground Service mode activated?

A

Selecting the GROUND SERVICE switch to ON while in Ground Handling mode

34
Q

Which additional loads are energized in the Ground Service mode?

A

Limited cabin systems & lighting

35
Q

Can the packs run when the aircraft is in External Power On mode?

A

Only if forward and aft external power is ON

36
Q

In flight, when would the Ram Air Turbine (RAT) deploy automatically?

A

Loss of all electrical power to the Captain’s and First Officer’s flight instruments

37
Q

The RAT provides Standby Power for which systems?

A

Captain’s flight instruments and other essential equipment for flight controls, navigation, and communication

38
Q

What supplies Standby Power until RAT deployment?

A

The Main battery

39
Q

List where Load Shed indications are displayed?

A
  1. A full list on the Electrical synoptic

2. The AIR, FUEL & HYD synoptics (shown in white), additionally, LOAD SHED text next to affected equipment symbol

40
Q

What is the purpose of the Circuit Breaker Indication and Control (CBIC) system?

A

It provides indication and control for Electronic Circuit Breakers (ECB), and indication-only for Thermal Circuit Breakers (TCB

787 Technical Questions (20 decks)

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