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Unofficial Airbus Study Site www.airbusdriver.net
Part 2 (On cycle - In Class)
Electrical
1. What does the EMER GEN red FAULT light indicate when illuminated?
This light illuminates red if the emergency generator is not supplying power when AC BUS 1 and AC BUS 2 are not
powered.
2. What does the amber FAULT light in either BAT 1, BAT 2 pushbutton indicate?
The charging current for the corresponding battery is outside limits. In this case the battery contactor opens.
3. What does the FAULT light indicate in the AC ESS FEED pushbutton?
The AC ESS BUS is not electrically supplied.
4. Are there any procedures in the Pilot's Handbook, which direct us to use the EMER GEN TEST switch?
None that I know of.
5. What is the purpose of the static inverter?
In the event of total AC power loss, if the aircraft speed is above 50 kts, an inverter is connected to the HOT BAT 1
bus and inverts DC current to single phase AC current which is supplied to the ESS AC bus. This switching will
occur regardless of the position of the BAT pbs. If the airspeed is less than 50 kts, both BAT pbs must be in auto
position for the switching to occur.
6. What does the AVAIL light in the EXT PWR pb mean?
AVAIL light illuminates green if:
 External power is plugged in, and
 External power parameters are normal.
7. If an IDG is disconnected in flight, can it be re-connected?
Pressing the IDG pb disconnects the IDG from its driveshaft. Only maintenance personnel can reconnect it.
8. What is the normal source of power for the AC ESS BUS?
The AC ESS bus is normally powered by AC BUS 1 through the AC essential feed contactor.
The AC ESS FEED pb allows the pilot to transfer the AC ESS bus power source from AC BUS 1 to AC BUS 2.
Note: In case of total loss of main generators, the AC ESS BUS is automatically supplied by the emergency
generator or by the static inverter if the emergency generator is not available.
9. What is the AUTO function of the GALLEY pb?
Main galley, secondary galley, and in-seat power supply are supplied. The main galley (A319/320), all galleys
(A321), and in-seat power supply are shed automatically when:
 In flight: only one generator is operating
 On the ground: only one generator is operating (All galleys are available when the APU GEN or EXT PWR is
supplying power)
10. Can the APU generator power all busses on the ground?
The APU can supply the entire electrical system on the ground.
2009 – 2010 TGS Study Guide
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Unofficial Airbus Study Site www.airbusdriver.net
Fire Protection
1. If a cargo smoke detector fails, does that render the system inoperative?
If one smoke detector fails, the system remains operational with the other detector.
2. When are the cargo fire bottle squibs armed?
When the Smoke Detection Control Unit issues a smoke warning.
3. If an APU fire occurs on the ground, what must be done to shut down the APU and extinguish the fire?
On the ground, detection of an APU fire causes automatic APU shutdown and extinguisher discharge. In flight,
there is no automatic APU shutdown, and the extinguisher must be manually discharged.
4. How many fire extinguisher bottles are available for fighting an engine fire?
Two
5. How many cargo smoke detectors must sense smoke to issue a warning?
Both cargo compartments are equipped with smoke detector loops. The forward compartment contains two smoke
detectors in the A319/320 and four smoke detectors in the A321. In the A319/320, the aft compartment contains
two loops with two detectors each. In the A321, the aft compartment contains three loops with two smoke
detectors in each. A Smoke Detection Control Unit issues a smoke warning when two smoke detectors of one loop
detect smoke. If one smoke detector fails, the system remains operational with the other detector.
Cargo smoke is indicated by an aural CRC, the illumination of the MASTER WARN and CARGO SMOKE light on the
CARGO SMOKE panel.
One extinguisher bottle supplies one nozzle in the forward compartment and two nozzles in the aft compartment.
The agent is discharged by pressing either the FWD or AFT DISCH pb.
If the cargo smoke warning is activated in either compartment, the associated isolation valves close and the
extraction fan stops.
6. What is required for a fire warning to be indicated in an engine or APU?
　
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