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B787-AF > Electrical > Flashcards

Electrical Flashcards

1
Q

Electrical

Which AC buses are depicted on the Synoptic ?
115 VAC or 235 VAC ?

A

235 VAC

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2
Q

Electrical

How are lower amperage loads distributed ?

A

By the RPDUs (remote Power Distribution Units)

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3
Q

Electrical

What manages the circuit breakers ?

A

The CBIC (Circuit Breaker Indication and Control)

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4
Q

Electrical

Which equipment are energized by the Towing Power mode ?

A
  • Captain’s audio control panel
  • Captain’s flight interphone
  • flight deck dome lights
  • Aisle stand flood lights
  • Navigation lights
  • Brakes
    NOTE : the radio communication systems are NOT energized.
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5
Q

Electrical

3 Permanent Magnet Generators (PMGs) provide power to which system ?

A

The Flight Control Electronics.

The FCE also have 2 dedicated batteries in case of temporary loss of regular power.

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6
Q

Electrical

Where is the Main 115 VAC system located ?

A

FWD E/E bay as well as the 28 VDC system

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7
Q

Electrical

How are higher amperage loads distributed ?

A

By the main electrical busses

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8
Q

Electrical

Where is the Main 235 VAC system located ?

A

AFT E/E bay

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9
Q

Electrical

What is the purpose of the Power Electronics Cooling System (PECS) ?

A

To dissipate the heat generated by the high voltage motor controllers.

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10
Q

Electrical

What do the motor controllers do ?

A

They regulate the frequency power sent to large motor loads.

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11
Q

Electrical

2 Permanent Magnet Alternators (PMAs) provide power to which system ?

A

The Electronic Engine Control (EEC)

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12
Q

Electrical

In addition to traditional electrically powered systems, which other systems does the 787 electrical system power ?

A
  • Engine start
  • Pressurization
  • wing ice protection
  • Stabilizer trim
  • 2 pairs of spoilers
  • wheel brake systems
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13
Q

Electrical

Can ECBs (electronic circuit breakers) be controlled via the CBIC ?

A

YES they can.

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14
Q

Electrical

How many electrical power sources are there ?

A

17 !

  • 3 External Power receptacles (2 FWD, 1 AFT)
  • 4 Engine starter/generators VFSGs (variable frequency)
  • 2 APU starter/generators (variable frequency)
  • 1 RAT
  • 1 main battery
  • 1 APU battery
  • 3 PMGs (Permanent Magnet Generators) powering the FCEs
  • 2 PMAs (Permanent Magnet Alternators) powering the EECs
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15
Q

Electrical

Can TCBs (thermal circuit breakers) be controlled via the CBIC ?

A

NO, only an Indication can be given.

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16
Q

Electrical

When is the PECS (Power Electronics Cooling System) energized ?

A

When:

  • APU is running or,
  • One or both engines is running or,
  • A FWD external power is connected and selected ON
17
Q

Electrical

What powers the 28 VDC system ?

A

The 235 VAC system through power conversion devices.

B787-AF (27 decks)

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