Electrical System Flashcards
Are there any procedures in the Pilot Handbook, which direct us to use the EMER GEN TEST switch?
No, this is a maintenance function
An amber SMOKE annunciation in the GEN 1 LINE pb indicates what?
Smoke in the avionics ventilation system.
If the GEN 1 LINE pb is selected to OFF, what becomes the power source to AC bus #1?
Generator #2, through the bus tie.
After selecting the GEN 1 LINE pb to OFF, is there any equipment still powered from generator #1?
Yes, one fuel pump in each tank.
What will cause the RAT to extend automatically?
Loss of AC bus 1 & 2 and airspeed above 100 knots.
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?
Emergency generator
What is the difference between this RAT MAN ON switch and the switch labeled similarly on the
hydraulic panel?
Emergency generator operation through the electrical RAT MAN ON
What does the FAULT light in the RAT & EMER GEN indicate?
FAULT light is illuminated if the emergency generator is not supplying power when AC BUS 1 & 2
are not powered.
What does a fault light in a BAT pb indicate?
Charging current is outsitde limits
Upon entering the flight deck prior to the first flight of the day, what should the battery voltage be?
Greater than or equal to 25.5 volts
What is the primary purpose of the batteries?
Emergency electrical and APU starting.
During preflight, what options are available if the battery voltage for either battery is below 25.5 volts?
Either replace the battery or using external power, complete a 20-minute charge and recheck for
sufficient voltage.
During the Safety & Power on checklist, why is the battery check accomplished with the batteries in the
OFF position?
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.
If the BATT switches are in AUTO position overnight without any other power, will the batteries
discharge completely?
No.
16.Under what conditions are the batteries connected to the DC BATTERY BUS?
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).
When is the main galley bus automatically shed?
Single generator operation
If the main galley bus sheds automatically on a single generator or power source, how is it powered on
the ground.
All galley buses are supplied with APU or External power
What does the FAULT light in the IDG pushbutton indicate?
High oil temperature or low oil pressure
What precautions exist when disconnecting an IDG?
Do not hold the disconnect pb for more than 3 seconds. The engine is must be running or
windmilling
If the pilot inadvertently pushes the IDG disconnect, can it be reconnected?
Not in flight
The normal priority for supplying electrical power to the AC busses is:
Engine generators, external power, APU.
What does the FAULT light indicate in the GEN 1 ?
A fault has been detected
What is the normal source of power for AC ESS BUS?
AC BUS 1.
Could AC 2 be used to power the AC ESS BUS?
Yes, through the AC ESS FEED pb (when selected).
What does the FAULT light indicate in the AC ESS FEED pb?
A fault has been detected, follow the ECAM procedure
What does the green AVAIL light indicate in the EXT PWR pb?
External power is connected and within normal parameters
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)?
APU, the EXT PWR must be selected ON
If both engines were started at the gate using external electrical power, would the EXT PWR ON light
still be illuminated?
Yes, however the engine driven generators are supplying power to the aircraft.
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?
No. EXT has priority over the APU. The green APU AVAIL light indicates that the APU generator is
available.
In the Emergency Electric configuration, when will the DC BAT bus be automatically connected to the
batteries?
Loss of AC Buses 1 & 2, Below 100 knots
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?
Loss of display units
What is the significance of the green circuit breakers?
ECAM monitored
Why do the Wing Tip Brake circuit breakers have red caps installed on them?
To prevent in-flight resetting
The FASTEN SEAT BELT, NO SMOKING, and EXIT signs come on automatically when the cabin
altitude exceeds ______ feet, regardless of the respective switch position.
11,300 feet
What is included in the aircraft emergency lighting?
Overhead emergency lights, EXIT signs, and floor proximity emergency escape path marking
system.
