Electrical ( chapter 6 )

Question 1

Bat Discharge Light amber?

Answer 1

Eccessive battery discharge detected

Question 2

TR Unit light amber?

Answer 2

on ground any TR failed

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

Question 3

ELEC light amber?

Answer 3

a fault exists in DC power system or Standby power

Note: Operates only with airplane on ground

Question 4

What does the BAT switch on ( guarded Position )

Answer 4

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.

Question 5

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

Answer 5

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

Note: IDG cannot be reconnected in the air.

Question 6

Standby Power Off ( PWR OFF ) light amber

one or more of the following buses are unpowered

Answer 6

AC standby bus
DC standby bus
battery bus

Question 7

GRD Power available light blue

Answer 7

ground power is connected and meets airplane quality standards

Question 8

Transfer bus off lights amber

Answer 8

related transfer bus is not powered

Question 9

Source off lights amber

Answer 9

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

Question 10

GEN OFF BUS lights blue

Answer 10

IDG is not supplying power to the related transfer bus

Question 11

BUS TRANSFER switch
AUTO

OFF

Answer 11

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

Question 12

Ground Service switch

FWD attendant panel

Answer 12

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