Electrical

Question 1

How many engine driven generators does the aircraft have?

Answer 1

Four

Question 2

How many total generators does the aircraft have?

Answer 2

Five

Question 3

Is the aircraft primarily AC or DC powered?

Answer 3

DC

Question 4

What is the purpose of the EDL?

Answer 4

Manages the electrical system during normal and abnormal operation

Question 5

Describe the main batteries

Answer 5

Two nickel-cadmium batteries 24 V DC, 44 Ah, 1-hour rate

Question 6

Describe the Backup Battery

Answer 6

One Lead-Acid Battery 24V DC, 5 Ah, 10-hour rate

Question 7

Which generators are on engine 1?

Answer 7

1 and 3

Question 8

Which generators are on engine 2?

Answer 8

2 and 4

Question 9

What is the purpose of the GCUs?

Answer 9

To control and protect their associated generators

Question 10

What speed N2 do the engine driven generators come on-line during start?

Answer 10

56.4%

Question 11

What power sources can be used to start the APU?

Answer 11

GPU
Battery 2
Battery 2 assisted by main generators

Question 12

How long can the main batteries power essential loads in flight?

Answer 12

40 minutes

Question 13

How long can the main batteries power the aircraft on the ground?

Answer 13

15 minutes

Question 14

What is the indication when a GPU is plugged into the aircraft but not selected?

Answer 14

The GPU AVAIL instruction illuminates inside the GPU button

Question 15

What items are powered by the Hot Battery Bus?

Answer 15

Courtesy/Stairs Lights
ELT
Engine Fire Bottles
Fuel Shutoff
Hydraulic Shutoff
Main Door Control
Pressure Refueling

Question 16

What items are powered by the Backup Hot Bus?

Answer 16

EDL
GCUs

Question 17

What are some items on the DC buses that would be lost during an electrical emergency?

Answer 17

Autopilot
FMS
IC-600#2
Lavatory
PFDs and MFDs
Pressurization
Radar

Question 18

What are some items powered by the shed buses?

Answer 18

Coffee maker
Nose wheel landing and taxi lights
Pre Recorded announcements
Recirc fan
Windshield Heat 2

Question 19

What is the purpose of the Central Bus?

Answer 19

To connect the APU generator to the load buses through the bus tie contactors

Question 20

What items have a secondary power source on the backup buses?

Answer 20

DAUs
EICAS
IC-600 #1
IRS

Question 21

What items are on the AC bus?

Answer 21

EGPWS
TCAS
Windshear

Question 22

When will the ground service bus be powered?

Answer 22

GPU connected to the aircraft, and NOT selected

Question 23

What is the purpose of the ground service bus?

Answer 23

To provide lighting for cleaning crews without them having to enter the cockpit

Question 24

Describe the electrical system with four or five generators.

Answer 24

Two networks, all buses powered

Question 25

Describe the electrical system with three generators

Answer 25

One network, all buses powered

Question 26

Describe the electrical system with one or two generators

Answer 26

One network, all buses powered except shed buses

Question 27

Describe the electrical system with no working generators in flight.

Answer 27

Batteries supply power to essential buses, Duration 40 minutes

Question 28

Describe the electrical system with no working generators on the ground.

Answer 28

Batteries supply power to essential buses and DC buses, Duration 15 minutes

Question 29

What does the term ELECTRICAL EMERGENCY mean?

Answer 29

Loss of all generators

Question 30

What does the Shed Bus OVRD knob do?

Answer 30

On the ground only, with one or two generators operating, the shed buses can be powered if this knob is set to the OVRD position

Question 31

What controls the electrical system bus tie contactors and load shedding?

Answer 31

Electrical Distribution Logic (EDL)

Question 32

When will a white strip be displayed inside the GPU button?

Answer 32

When the button is pressed in

Question 33

How does the EDL configure the electrical system during APU start?

Answer 33

Battery 1 contactor opens, isolating the number 1 battery to provide stable power to the backup buses

Question 34

What happens when the backup button is pressed?

Answer 34

When pressed out, it removes power from the backup buses and prevents the backup battery from charging

Question 35

When should the Avionics Master buttons be pressed out?

Answer 35

During APU start and prior to aircraft shutdown

Question 36

What does the Essential Power Button do?

Answer 36

When pressed in, it overrides the EDL and connects the batteries to the essential buses only

Question 37

If the batteries, APU, and GPU are all connected and operating, which takes priority?

Answer 37

GPU

Question 38

Can the GPU charge the batteries?

Answer 38

No

Question 39

If the main battery voltage is below _, it must be replaced

Answer 39

19V

Question 40

During an electrical emergency, can an ILS approach be flown?

Answer 40

Yes, using the RMU navigation page