Electrical System

Question 1

In descending order, the priority for electrical power is

Answer 1

Onside engine generator, external power, APU, remaining engine generator

Question 2

According to the graphic, what she powering the airplane

Answer 2

Engine driven generators (from the synoptic page)

Question 3

What is a characteristic of the APU electrical system?

Answer 3

Can power the entire plane on the ground

Question 4

What is a characteristic of the electrical system

Answer 4

System operation is normally automatic

Question 5

The bus tie contractors open or close automatically to maintain power supply to AC busses 1 and 2 when the bus tie switch is in the _____ position

Answer 5

Auto (lights out)

Question 6

While the APU is running and external power plugged in, what is the indication that the APU generator is powering the AC tie bus?

Answer 6

EXT PWR AVAIL light illuminated

Question 7

EXT PWR AVAIL light indicates external power is

Answer 7

Plugged in and electrical parameters are normal

Question 8

Following pushback, what is the configuration of the electrical system when engine 1 is running and the APU is operating

Answer 8

GEN 1 powers AC bus 1 and the APU generator powers AC bus 2

Question 9

Do not hold the IDG disconnect switch for more than _____ to prevent possible damage to the disconnect mechanism

Answer 9

3 seconds

Question 10

In the event of a single IDG failure, the remaining IDG powers

Answer 10

The entire electrical system, except for the main galley bus

Question 11

Do not disconnect the IDG when the

Answer 11

Engine is not running or not windmilling

Question 12

If the IDG 1 switch is pushed in-flight

Answer 12

IDG 1 can only be reconnected on the ground by maintenance

Question 13

What occurs when an IDG is disconnected

Answer 13

The corresponding generator can no longer supply power

Question 14

GALY & CAB FAULT light indicates

Answer 14

A generator load exceeds 100% of rated output

Question 15

A GEN FAULT light indicates

Answer 15

The line contactor is open without selecting the respective GEN switch OFF

Question 16

In flight, with only one-engine generator operating, how is the electrical system configured

Answer 16

The main galley power supply is automatically shed

Question 17

In the event of a single TR failure, how is the DC system affected?

Answer 17

DC busses 1 and 2 will interconnect through the DC BAT bus. ESS TR powers the DC ESS bus

Question 18

With the loss of TR 1, what pilot action is required

Answer 18

No action required: system automatically powers DC bus 1 with TR 2

Question 19

Which bus normally powers the AC ESS bus

Answer 19

AC bus 1

Question 20

AC ESS FEED FAULT light

Answer 20

Illuminates amber when AC ESS bus is not electrically powered

Question 21

In case of AC bus 1 failure, the AC ESS bus can be transferred to AC bus 2 by

Answer 21

Doing nothing, system switching is automatic

Question 22

AC and DC ESS SHED busses

Answer 22

Are shed when aircraft is on battery power only

Question 23

What is a characteristic of the battery power system

Answer 23

An automatic cutoff logic prevents the batteries from becoming completely discharged on the ground

Question 24

When flying on battery power only, what is the approximate battery endurance

Answer 24

22 minutes

Question 25

A battery with low voltage can be charged by

Answer 25

Switching external power to ON and ensuring the affected BAT switch is ON

Question 26

How are batteries charged

Answer 26

Automatically when DC power is supplied to the DC BAT bus and the BAT switches are ON

Question 27

According to the graphic the batteries are

Answer 27

Being Charged (from the graphic on the slide)

Question 28

BAT FAULT light indicates

Answer 28

Charging current is outside normal limits

Question 29

The Emergency Electrical Configuration

Answer 29

Is the result of loss of AC busses 1 and 2 above 100 knots

Question 30

In the Emergency Electrical Configuration, which Electronic Instrument System (EIS) displays are powered

Answer 30

PFD 1, ND 1, and upper ECAM

Question 31

Pushing the MAN ON switch extends the RAT

Answer 31

Anytime since it is always powered

Question 32

On earlier A320s, the emergency generator operates only with

Answer 32

The landing gear retracted

Question 33

On later A320s and all 319s, the emergency generator operates

Answer 33

Until touchdown, regardless of landing gear position

Question 34

If the main gear is retracted in the emergency electrical configuration, the MAN ON switch must be pushed to regain the emergency generator on which airplanes

Answer 34

Earlier 320s

Question 35

How is fuel fed to the engines in the emergency electrical configuration

Answer 35

No pumps operate, the engines are gravity fed

Question 36

What is a characteristic of the ECAM monitored circuit breakers

Answer 36

Cause an ECAM “C/B TRIPPED” caution to appear if tripped or pulled for more than one minute