Electrical System

Question 1

What % NH starter becomes generator?

Answer 1

61.5%

Question 2

Minimum Np for ACW

Answer 2

66%

Question 3

How much DC power supplied by generator?

Answer 3

28V

Question 4

How much power supplied by the two inverters?

Answer 4

26V

115V

Question 5

ACW power voltage?

Answer 5

115V

200V

Question 6

How much power does TRU give?

Answer 6

28V DC

Question 7

What supplies TRU?

Answer 7

ACW BUS 2

Question 8

What Np is ACW Gen MAINTAINED

Answer 8

70.8%

Question 9

What supplies GRND Handling bus on ground no EXT PWR?

Answer 9

HOT MAIN BAT BUS

Question 10

What supplies GRND Handling bus on ground with EXT PWR but not ON?

Answer 10

EXT PWR via DC SVCE BUS

Question 11

UNDV light triggered when

Answer 11

19.5V

Question 12

Pressing OVRD pb, DC and AC STBY BUS transferred from

Answer 12

HOT MAIN BAT BUS to HOT EMER BAT BUS

Question 13

What happens when OVRD pb pressed in

Answer 13

DC STBY BUS recovered and UNDV extinguish

Question 14

TRU supplies which busses?

Answer 14

DC EMER BUS
DC ESS BUS
DC&AC STBY BUS

Question 15

X START FAIL means?

Answer 15

opposite gen did not come online to assist start at 10% NH

Question 16

DC BUS 1 supplied by which DC GEN

Answer 16

DC GEN 1

Question 17

Electrical power generation is powered by

Answer 17

• Main and emergency batteries
• Two engine-driven DC starter/generators
• Two AC wild frequency generators
• Two external power units (AC and DC).

Question 18

the 28v DC can be provided by

Answer 18

• Two engines driven starter/generators

- One ground external power unit

Question 19

Three sources can be used for the 28 VDC emergency supply:

Answer 19

• One main battery
• One emergency battery, excluding START function
• One TRU

Question 20

Main BAT rating

Answer 20

24v NiCd bat 43 Ah

Question 21

EMER BAT rating

Answer 21

24v NiCd bat 17 Ah

Question 22

Bat monitoring perfomed by?

Answer 22

MFC

Question 23

Starter generator driven by?

Answer 23

engine accessory gearbox

Question 24

Starter mode, starter/gen is power by

Answer 24

Main bat
EXTPWR
Mainbat+operating generator(cross start)

Question 25

EXTPWR takes precedence yes no

Answer 25

Yes

Question 26

BPCU controls?

Answer 26

Bus Power Control Unit 
controls: BTC Bat Start Contactor,
Load shedding,
Extpwrfunctions,
DC SVCE BUS contactors

Question 27

11 DC BUSSES

Answer 27

DC BUS 1
DC BUS 2
HOTMAIN BAT BUS
HOT EMER BAT BUS
DC EMER
DC ESS
DC STBY
UTLY BUS 1
UTLY BUS 2
DC SVCE
GND HDLG