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787 Systems > Electrical > Flashcards

Electrical Flashcards

1
Q

What HYD systems are Electric in 787

A

Stabilizer Trim
Spoilers
Main Wheel Brakes

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2
Q

What is the Location of the 3 electric power supply

A

FWD E/E Bay - 115 Vac and 28VDC

AFT E/E Bay - 235 Vac

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3
Q

What power supply is Ext

A

115 Vac usually both FWD

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4
Q

What power supplies are used for a normal start

A

Both FWD Vac and APU

or

Both FWD Vac and AFT Vac if APU is inop
(Supplementary procedure)

Only the Right eng can be started if Ext Pwr is the only source

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5
Q

What Converters are on board

A

235 Vac –> 28 VDC

115 Vac –> 235 Vac to operate Hyd pumps Eng starters NGS

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6
Q

What AC buses do we have

A

L1 Main
L2 Main
R1 Main
R2 Main

When APU or Eng gen online they supply 235 Vac which converts to 115 Vac and 28 VDC pwr

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7
Q

What generators does the APU have

A

2 - 235 Vac starter/generators

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8
Q

How can APU start be powered

A

APU bat
Ext Pwr
Eng Gen

(one started is used for APU start but both generators available after for pwr delivery)

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9
Q

Describe the Eng Starter/Generators

A

2 - 235 Vac on each eng L1, L2

unlike the APU both starters assist in eng starting

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10
Q

Where does the 235 Vac power from the eng go

A

to the AFT E/E bay

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11
Q

In normal operation which gen supplies which bus

A

L1 - L1
L2 - L2
R1 - R1
R2 - R2

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12
Q

After the Buses where does the 235 Vac power go

A

Large Motor Power system

In AFT E/E Bay, and cooled by the PECS

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13
Q

What are RPDU’s

A

Remote Power Distribution

used for lower amp loads through 17 units throughout the aircraft

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14
Q

Where can you see the systems Load Shed?

A

Synoptic

SYS - ELEC page, bottom middle

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15
Q

Where does the power for starting eng 2 come from

A

assisted by Large Motor Power System

indicated on the Synoptic page

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16
Q

What batteries are on board?

A

2 - 28 VDC

Main Bat - FWD E/E bay
APU Bat - AFT E/E bay

17
Q

What powers the Flight controls

A

3 Permanent Magnet Generators

L1, L2, R2

(ensures power to the flight controls is independent to the rest of the system as long as one eng is rotating)

18
Q

What powers the brakes

A

4 power supplies in the FWD E/E

2 separate 28 VDC inputs from the primary power source and from the MAIN Battery

19
Q

What is the BPCU

A

Bus Power Control Unit

Electronic controller that determines the power distribution for different configurations

Flight deck control and indication

Determines different Modes

20
Q

How does the BPCU protect systems

A

Load Sheading

Load Inhibiting

21
Q

What type of circuit breakers

A

ECB’s - Electronic (indication and control)

TCB’s - Thermal (just Indication)

22
Q

What are the Two type of power distribution methods?

A

Primary and Remote

23
Q

What does turning the Battery on do when first arrive at aircraft

A

ON-Ground Battery Only Mode

allows the power up sequence

APU start capability

CCR L (CDU screen on)

24
Q

What starter is used when APU started with Battery power

A

Right Starter on APU

25
Q

Where does the APU power go

A

235 Vac Busses

26
Q

What is powered with only one FWD Ext Pwr source

A

FLT Deck Equipment
Cabin Systems
Cabin Lighting
PECS (single loop)

27
Q

What is powered with 2 FWD Ext Sources

A 
NGS
HYD
IFE
Cabin Systems
Cabin Lighting
PECS (Both Loops)
28
Q

Does the Main Battery have to be on for Ground Handling Mode

A

NO

just one Ext Source

(mostly service and cargo items)

29
Q

Does the Main Battery have to be on to turn on Ground service mode by the flight Attendants?

A

No

an extension of the Ground Handling mode and allows the FA’s to turn on systems without pilots there

30
Q

What is the Priority sequence of the Power sources

A

Eng
APU
Ext Pwr

31
Q

What powers what buses with one eng started by APU

A

running eng powers the 2 buses on the same side (R1 R2)

APU powers the 2 other 2 buses (L1 L2)

32
Q

When does the APU automatically start

A

3 or more eng generators go off line

33
Q

When does the RAT automatically deploy

A

Loss of electrical power to the CA and FO flight instruments (In air Rat mode)C

(MAIN Bat supplies until RAT deploys)

34
Q

What is the difference between the RAT and Main Bat supply

A

Center Pitot heat not energized

35
Q

What is the CBIC system

A

Circuit Breaker Indication and Contol

on SYS - MFD - CB

36
Q

When do you get a confirmation window when opening and closing a CB

A

In Flight

787 Systems (19 decks)

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