Electrical Systems

Question 1

Name the four sources of Electrical Power

Answer 1

Main Battery
Starter Generator
Auxiliary Battery
External Power

Question 2

Which side of the cockpit is the Generator Bus (and associated CBs) located on?

Answer 2

Right hand side.

Question 3

Which side of the cockpit is the Battery Bus (and associated CBs) located on?

Answer 3

Left hand side.

Question 4

Which bus is the battery always connected to?

Answer 4

The Hot Bat Bus

Question 5

What is the purpose of the Hot Bat Bus?

Answer 5

To run essential systems, such as OBOGS and the emergency flap system.

Question 6

Which piece of equipment links the engine to the Generator in order to allow it to generate power?

Answer 6

The Accessory Gearbox.

Question 7

What is the purpose of the Bus Tie?

Answer 7

To connect the Bat and Gen buses, so that the Generator can power all systems once the engine has started.

Question 8

What is the minimum voltage required from the battery before external power is connected?

Answer 8

22V

Question 9

What is the minimum voltage required from the battery if a battery start is required?

Answer 9

23.5V

Question 10

What is the maximum voltage of the External Power?

Answer 10

32.2V

Question 11

What could happen if the battery voltage is too low, or the external power voltage is too high?

Answer 11

Excessive charging and battery damage.

Question 12

If the battery and generator both fail, how long will the auxiliary battery provide power to essential systems for?

Answer 12

20 to 30 minutes.

Question 13

How do you test the five cells of the auxiliary battery?

Answer 13

By holding the Aux Bat Test switch up for 5 seconds. If the light goes out after “x” seconds, cell “x” is U/S.

Question 14

Describe the Anti-Collision Strobe light sequence.

Answer 14

A burst of 4 flashes at a rate of 45+-5 times a minute. The first flash is at full brilliance, and the following three are at half brilliance.

Question 15

Which bus powers the Anti Collision Lights when in Setting 1?

Answer 15

Bat Bus

Question 16

Which bus powers the Anti Collision Lights when in Setting 2?

Answer 16

Gen Bus

Question 17

What is the difference between Anti Collision Lights Setting 1 and 2?

Answer 17

Position 1: Wingtip Flashes

Position 2: Wingtip Flashes and Forward Facing Wingtip Lights

Question 18

What is the meaning of a red caption?

Answer 18

Warning

Question 19

What is the meaning of an amber caption?

Answer 19

Caution

Question 20

What is the meaning of a white caption?

Answer 20

Status Indicator

Question 21

What is the meaning of a green caption?

Answer 21

System Advisory

Question 22

Will normal flap operation be available when the Aux Batt is the only source of power?

Answer 22

No

Question 23

Will normal flap operation be available when the Batt Bus has failed?

Answer 23

No

Question 24

What happens if electrical power to the flaps is interrupted?

Answer 24

The flaps will retract to the Up position.

Question 25

Will emergency flap operation be available when the Aux Batt is the only source of power?

Answer 25

No.

Question 26

State the seven elements powered by the Aux Batt Bus.

Answer 26

Radio Relays
Com 2
Front BFI 
Rear BFI
Fire 1
IRS
Standby Lights

Question 27

Which bus bar is always isolated from the battery bus, no matter the position of the bus tie?

Answer 27

The hot gen bus.