Electrical ( chapter 6 ) Flashcards

1
Q

Bat Discharge Light amber?

A

Eccessive battery discharge detected

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2
Q

TR Unit light amber?

A

on ground any TR failed

in flight TR 1 failed or TR 2 and TR 3 failed

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3
Q

ELEC light amber?

A

a fault exists in DC power system or Standby power

Note: Operates only with airplane on ground

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4
Q

What does the BAT switch on ( guarded Position )

A

provides power to switched hot battery bus

energizes relays to provide automatic switching of standby electrical system to battery power with loss of normal power.

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5
Q
Generator Drive ( DRIVE ) lights mean amber
IDG low oil pressure caused by one of the following
A

IDG failure
engine shutdown
auto disconnect due to high oil temperature
IDG disconnect switch

Note: IDG cannot be reconnected in the air.

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6
Q

Standby Power Off ( PWR OFF ) light amber

one or more of the following buses are unpowered

A

AC standby bus
DC standby bus
battery bus

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7
Q

GRD Power available light blue

A

ground power is connected and meets airplane quality standards

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8
Q

Transfer bus off lights amber

A

related transfer bus is not powered

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9
Q

Source off lights amber

A

no source has been selected to power the bus or has been manually disconnected

Note: source has been selected to power opposite transfer bus, both transfer busses are powered

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10
Q

GEN OFF BUS lights blue

A

IDG is not supplying power to the related transfer bus

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11
Q

BUS TRANSFER switch
AUTO

OFF

A

BTB operate automatically power to AC Transfer busses

Note: DC cross tie relay automatically provides normal or isolated operation as required

isolates AC transfer bus 1 from AC bus 2

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12
Q

Ground Service switch

FWD attendant panel

A

provides manual control to ground service busses without activation AC transfer busses

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