Electrical

Question 0

P6 panel location? How many

Answer 0

On right sidewall behind FO

4 panels

Question 1

P7 panel location?

Answer 1

Aft of the overhead panel

Question 2

AC system powered by? AC pwr with engines running?

Answer 2

2 APU generators and/ or 2 ext pwr receptacles.

4 IDG’s

Question 3

How are AC buses powered while on the ground?

Answer 3

By ext pwr and APU generators through the synchronous bus

Cannot be paralleled

Question 4

“AVAIL” lights indicate

Answer 4

Voltage and frequency of the respective pwr source are within limits

Question 5

IDG’s lubricated and cooled by……

Answer 5

Self-contained oil system

Question 6

Each IDG has a gen control sw and gen drive disconnect sw

T or F?

Answer 6

True

Question 7

ELEC DRIVE 3 ( or 1,2,3,4)

Answer 7

Either low oil psi, or high oil temp, or GCB open due to uncorrectable gen freq fault in respective IDG.

Question 8

Purpose of Synchronous bus?

Answer 8

Interconnects the 4 AC busses and allows the 4 IDG’s to work in parallel.

Question 9

Split system breaker (ssb)

Answer 9

Separates synchronous bus into left and right half and allows each half to be powered by different APU or external power sources.

Question 10

Ground handling bus powers?

Answer 10

Fueling sys
Lower cargo handling equipment
Lower cargo compartment lights
Aux hyd pump 4
Flight deck access lights

Question 11

Ground service bus powered when?

Answer 11

Powered by AC bus 1 on the gnd and in flight

Question 12

Gnd handling bus can be powered on Flt and gnd?

Answer 12

False, gnd only

Question 13

Gnd handling bus powers….

Answer 13

Lwr cargo handling equipment

Lower cargo doors

Aux hyd pump 4

Lwr cargo compartment lights

Fuel equipment

Question 14

Gnd handling bus automatically when?

Answer 14

Ext pwr one is AVAIL

If not available, APU GEN 1 will power if AVAIL

Question 15

Gnd service bus powers…

Answer 15

Both battery charger
Cabin and service lighting
Main tank 2 & 3 aft fuel pumps
NAV lights
Service outlets

Question 16

Gnd service bus powered by?

Answer 16

AC bus 1

May be powered by EXT PWR 1 if available by pushing “gnd svc” switch at L1 door.

Question 17

Main deck cgo handling bus powered when?

Answer 17

On gnd only!

Question 18

When is MDCH bus powered?

Answer 18

Automatically when EXT PWR 2 or APU GEN 2 is AVAIL

Ext 2 has priority if both are available

Question 19

Must all P7 cb’s be in for normal operation?

Answer 19

Yes

2 P7 panel

Question 20

How many P6 panels?

Answer 20

4

Question 21

What is powered on the gnd svc bus? Service the clam!

Clam

Answer 21

Chargers
Lights
APU fuel pump
Misc equipment

Question 22

What is powered by the gnd handling bus?

Hold the handle so you don’t FALL

Answer 22

Fueling panel
Aux hyd pump
Lights
Lower cgo handle

Question 23

Utility buses power:

Answer 23

fuel boost pumps (2)
fuel override/jettison pumps (3)

crew rest lighting
selected a/c components
lav equipment
galley power
misc equipment
electrical outlets

Question 24

ELCU?

Answer 24

utility busses connected to ac bus via ELCU.
monitors load and power
provides load shedding capability

Question 25

Can bus ties be reset? how about gcs?

Answer 25

yes, press once for off. then again for reset. if fault is cleared, it will reset.