Electrical System

Question 1

Are there any procedures in the Pilot Handbook, which direct us to use the EMER GEN TEST switch?

Answer 1

No, this is a maintenance function

Question 2

An amber SMOKE annunciation in the GEN 1 LINE pb indicates what?

Answer 2

Smoke in the avionics ventilation system.

Question 3

If the GEN 1 LINE pb is selected to OFF, what becomes the power source to AC bus #1?

Answer 3

Generator #2, through the bus tie.

Question 4

After selecting the GEN 1 LINE pb to OFF, is there any equipment still powered from generator #1?

Answer 4

Yes, one fuel pump in each tank.

Question 5

What will cause the RAT to extend automatically?

Answer 5

Loss of AC bus 1 & 2 and airspeed above 100 knots.

Question 6

In flight with the airplane powered normally (both generators), we push the RAT MAN ON switch. What
will power the AC and DC ESS buses?

Answer 6

Emergency generator

Question 7

What is the difference between this RAT MAN ON switch and the switch labeled similarly on the
hydraulic panel?

Answer 7

Emergency generator operation through the electrical RAT MAN ON

Question 8

What does the FAULT light in the RAT & EMER GEN indicate?

Answer 8

FAULT light is illuminated if the emergency generator is not supplying power when AC BUS 1 & 2
are not powered.

Question 9

What does a fault light in a BAT pb indicate?

Answer 9

Charging current is outsitde limits

Question 10

Upon entering the flight deck prior to the first flight of the day, what should the battery voltage be?

Answer 10

Greater than or equal to 25.5 volts

Question 11

What is the primary purpose of the batteries?

Answer 11

Emergency electrical and APU starting.

Question 12

During preflight, what options are available if the battery voltage for either battery is below 25.5 volts?

Answer 12

Either replace the battery or using external power, complete a 20-minute charge and recheck for
sufficient voltage.

Question 13

During the Safety & Power on checklist, why is the battery check accomplished with the batteries in the
OFF position?

Answer 13

To determine the exact battery voltage. In the AUTO position, the aircraft is essentially in an
emergency electrical configuration less than 50 knots, which means that the essential DC bus and
the static inverter would be powered.

Question 14

If the BATT switches are in AUTO position overnight without any other power, will the batteries
discharge completely?

Answer 14

No.

Question 15

16.Under what conditions are the batteries connected to the DC BATTERY BUS?

Answer 15

Each battery’s BATTERY CHARGE LIMITER automatically connects the batteries to the DC BATT
BUS when needed to supply electrical power for APU start; when Emergency electrical configuration
less than 100 knots; or batteries require charging (voltage below 26.5V).

Question 16

When is the main galley bus automatically shed?

Answer 16

Single generator operation

Question 17

If the main galley bus sheds automatically on a single generator or power source, how is it powered on
the ground.

Answer 17

All galley buses are supplied with APU or External power

Question 18

What does the FAULT light in the IDG pushbutton indicate?

Answer 18

High oil temperature or low oil pressure

Question 19

What precautions exist when disconnecting an IDG?

Answer 19

Do not hold the disconnect pb for more than 3 seconds. The engine is must be running or
windmilling

Question 20

If the pilot inadvertently pushes the IDG disconnect, can it be reconnected?

Answer 20

Not in flight

Question 21

The normal priority for supplying electrical power to the AC busses is:

Answer 21

Engine generators, external power, APU.

Question 22

What does the FAULT light indicate in the GEN 1 ?

Answer 22

A fault has been detected

Question 23

What is the normal source of power for AC ESS BUS?

Answer 23

AC BUS 1.

Question 24

Could AC 2 be used to power the AC ESS BUS?

Answer 24

Yes, through the AC ESS FEED pb (when selected).

Question 25

What does the FAULT light indicate in the AC ESS FEED pb?

Answer 25

A fault has been detected, follow the ECAM procedure

Question 26

What does the green AVAIL light indicate in the EXT PWR pb?

Answer 26

External power is connected and within normal parameters

Question 27

If the green AVAIL light is present in the EXT PWR pb and a green AVAIL light on the APU, what is the
source of electrical power (with engines shut down)?

Answer 27

APU, the EXT PWR must be selected ON

Question 28

If both engines were started at the gate using external electrical power, would the EXT PWR ON light
still be illuminated?

Answer 28

Yes, however the engine driven generators are supplying power to the aircraft.

Question 29

If EXT power is in use during APU start, does the green AVAIL light in the APU START pb indicate it is
now the source of ship’s electrical power?

Answer 29

No. EXT has priority over the APU. The green APU AVAIL light indicates that the APU generator is
available.

Question 30

In the Emergency Electric configuration, when will the DC BAT bus be automatically connected to the
batteries?

Answer 30

Loss of AC Buses 1 & 2, Below 100 knots

Question 31

If landing in Emergency Electric configuration and speed decreases below 50 knots, the AC ESS bus is
shed. What would be indication to the crew?

Answer 31

Loss of display units

Question 32

What is the significance of the green circuit breakers?

Answer 32

ECAM monitored

Question 33

Why do the Wing Tip Brake circuit breakers have red caps installed on them?

Answer 33

To prevent in-flight resetting

Question 34

The FASTEN SEAT BELT, NO SMOKING, and EXIT signs come on automatically when the cabin
altitude exceeds ______ feet, regardless of the respective switch position.

Answer 34

11,300 feet

Question 35

What is included in the aircraft emergency lighting?

Answer 35

Overhead emergency lights, EXIT signs, and floor proximity emergency escape path marking
system.