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777 Type Rating > POWER DISTRIBUTION > Flashcards

POWER DISTRIBUTION Flashcards

1
Q

Two buses for servicing AC

A

Ground handling and ground servicing bus
No switches for ground handling bus
External power has priority over APU for powering the ground handling bus

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2
Q

Ground handling bus powers

A

Cargo doors
Cargo compartment lights
Maintenance access dooors

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3
Q

Ground service bus

A

For cabin service personnel
Cabin lights and outlets
Battery chargers for main and APU battery chargers
Left forward fuel pump (APU fuel)

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4
Q

Ground service switch at attendants panel

A

Can be used to power the ground service bus when buses are not powered by any other source of power

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5
Q

Right main AC bus powered

A

Ground service bus powered

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6
Q

If right AC bus not powered and APU running

A

Ground service bus is powered by APU gen through the same ground service switch

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7
Q

In cabin with IFE/PASS SEATS and CABIN/UTILITY switches on

A

The ground service bus, utility bus and galleys are powered normally

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8
Q

Cabin utility switch off

A

Removes power form cabin lighting and outlets portion of ground service bus
The main and APU battery chargers and left fwd fuel pump remain powered

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9
Q

Powered removed fro cabin lighting

A 
The following turned on
Night lights
Supp night lights
Reading lights
Attendant work lights
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10
Q

DC POWER SYSTEM

A

PDFs
ND
GPS
ADIRU

Fully automatic/no controls

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11
Q

Sources of DC POWER

A

2 batteries
APU
Main battery
Monitored by ELMS

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12
Q

Main soursce of DC POWER

A 
By 4 TRU
Transformer rectifier units
AC to DC power
Powered by two transfer buses
They power 4 DC buses

TRU L
LMAIN DC BUS

TRU C1
CAPT FLT INST BUS

TRU C2
FO FLT INST BUS

TRU R
R MAIN DC BUS

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13
Q

If TRU Fails

A

Tie relays connect the left and right DC buses

And CAPT and FO FLT instrument buses this allows all buses to remain powered

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14
Q

Flight controls DC system

A

Fly by wire

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15
Q

PMGs

Permanent magnet generators

A

Housed within each backup gen

Power source for the flight controls

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16
Q

If one or more PMGs fail in flight

A

The main DC buses or the captains flight instrument bus power the flight control,DC buses

17
Q

AUTP LAND ELECTRICAL CONFIG

A

Each of three AP powered by seperate power sources
During power from to the right transfer bus switches from the right main AC bus to the back up gen

NORMAL
Right and centre AP powered by right main gen
Left AP left gen

APPROACH
Left AP left gen
Right AP right back up gen
Centre AP right main gen

777 Type Rating (22 decks)

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