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B777 Study > Electrics > Flashcards

Electrics Flashcards

1
Q

Primary external power powers?

A

R main bus

R transfer bus

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2
Q

Secondary external power powers?

A

L Main bus

L Transfer bus

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3
Q

Electric system provides what powers?

A

AC & DC

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4
Q

Sources of main AC power are?

A

L & R IDGs
APU gen
External power

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5
Q

How many AC power sources are needed to power the entire AC?

A

2

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6
Q

Sources of DC power are?

A

4 TRUs
2 PMGs - Flt cntl DC elec sys
Main battery
APU battery

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7
Q

If all electrics off the main battery still powers what? Which provides?

A

Hot battery bus

APU fire extinguisher
Engine fire extinguisher
ADIRU

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8
Q

Ground handling bus automatically powered when? Used for?

A

When Primary external power available.

Used for cargo handling, fuelling, other ground operations

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9
Q

Ground service bus does? When powered?

A

Gives interior cabin lights & plug sockets.
Switched on at door L1

Auto Powered when R main AC bus powered

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10
Q

Normally Main AC busses get power from?

A

Respective IDGs

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11
Q

ELMS load shedding removes? And repowers?

A

Galleys
Utility busses
Individual items

Re powers in reverse order

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12
Q

At the gate with PRI ext power on you start the APU, what powers what?

A

PRI EXT powers: R main R XFR

APU powers: L Main L XFR

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13
Q

After arriving at the gate with PRI EXT power AVAIL selecting it on will? (No APU)

A

Power L & R MAin AC busses - removes IDG sources

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14
Q

BUGS automatically power the

A

Transfer busses when needed.

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15
Q

If both main AC busses fault How many BUGS do what?

A

Only 1 BUG will power both L & R transfer busses

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16
Q

During an auto land approach what happens to the electrical system when approach is selected?

A

1 BUG energises a XFR bus ( redundancy)

17
Q

DC electric system compromises of

A

Main DC power

Flt cntl DC system

18
Q

C1 TRU powers

A

Battery bus
Capts flight instruments

(And gives a back up for FOs and C flight controls)

19
Q

The standby electric system can provide AC & DC power to? In the event of a total power loss.

A

Selected instruments
Comms
Nav systems
Flight control systems

20
Q

Standby system is usually powered by?

A

TRUS

21
Q

RATs main priority is?

What powers standby?

A

Hydraulics

Main battery powers standby elec system.

22
Q

If the RAT is supplying electrical power what is available to pilots?

A

BOTH FO & CAPT flight instruments

23
Q

If main battery is providing electrical power only what do you have?

A

CAPT flight instruments only

24
Q

If L & R bus tie breakers are closed is means the AC power is supplied by how many systems?

A

1

25
Q

When a single IDG is operating and external power connected what happens?

A

Single IDG powers both L & R main busses, kicks off external power

26
Q

Standby electrical system is made up of?

A

Main battery
Standby inverter
RAT generator and generator control unit

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