A320-ATA-24 Electrical Flashcards
The engine generators and APU generator are rated at _____ KVA.
90
The number 1 AC bus channel normally supplies power to _____ and to the _____ bus which supplies power to the ______ bus.
TR1 / AC ESS / AC ESS SHED
The normal priority for supplying electrical power to the AC busses is:
Engine generators, external power then APU
The BATTERY BUS is normally powered by:
DC bus 1 through a DC tie control relay.
The A-320 has _______ batteries in its main electrical system.
2
When no other power is available in flight, the static inverter converts _____ power to AC power for the ______ bus; and ______ powers the _______ bus.
BAT1 DC / AC ESS bus / BAT2 / DC ESS
An AC ESS FEED switch located on the overhead panel shifts the power source for the AC ESS bus from
AC bus1 to AC bus 2
Which of the following AC busses can be powered by the emergency generator?
AC ESS bus / AC ESS SHED bus
The RAT is connected directly (mechanically) to the Emergency Generator
FALSE
After landing, in the emergency electrical configuration: the batteries automatically connect to the DC BAT bus when speed decreases below _______ knots
100
The BAT FAULT light will illuminate when:
Charging current increases at an abnormal rate
Do not depress the IDG DISCONNECT switch for more than _______ to prevent damage to the disconnect mechanism.
3 seconds
The IDG Fault light indicates:
IDG low oil pressure or IDG oil overheat
If normal electrical power is lost; essential cockpit lighting is maintained for the:
A: Captain’s instrument panel.
B: Standby compass
C: Right dome light (provided the dome selector is not off).
You enter a dark cockpit, what action is necessary before checking the battery voltages?
You have to verify that both batteries are off.
Having started the APU, how can you get the APU generator to power the electrical system?
By pushing the EXT PWR pushbutton thus disconnecting the external power.
Are there any limitations associated with disconnecting an IDG?
Never disconnect an IDG unless the engine is running, nor push the IDG disconnect push button for more than 3 seconds.
Which voltage requires recharging the batteries?
25.5 or less
What is the significance of the green collared circuit breakers?
Green collared circuit breakers are monitored by the ECAM
If batteries are the only source of power in flight, how long will battery power be available?
Between 22 and 30 minutes depending on equipment in use.
What is the minimum voltage when conducting a BATTERY CHECK?
Greater than 25.5 volts.
Which flight control computer will be inoperative with gear extension while in the Emergency Electrical Configuration?
FAC 1
Is it possible to parallel generators?
The electrical system will not allow “paralleling” of generators.
While operating on Emergency Electrical Power with the landing gear lowered which of the following control laws is in effect?
Direct.
What cockpit lighting is available during an emergency electrical situation?
Right side Dome light, main panel flood lights (left two columns only), and the standby compass light.
What is the function of the GEN 1 LINE push button?
When selected OFF generator # 1 is removed from all busses but continues to power one fuel pump in each wing.
During a routine flight, what will be the result after the loss of Gen #2 and the subsequent start of the APU?
Eng gen #1 continues to power AC bus #1 and downstream systems. The APU powers AC bus #2 and downstream systems.
When does the RAT automatically deploy?
Electrical power to both AC BUS #1 & #2 is lost and the aircraft speed is above 100 knots.
During the five seconds it takes for the RAT to extend:
The BATTERIES power both BATT HOT busses, ESS DC, and ESS AC through the STATIC INVERTER.
True or False?
The purpose of the AUTO BUS TIE is to allow either engine-driven IDG to automatically power both main AC buses in the event of a generator loss until either ground power or the APU generator is activated.
True.
When will the RAT & EMER GEN red FAULT light illuminate?
When the EMER GEN is not supplying electrical power, AC busses #1 & #2 are unpowered and the nose gear is up.
What is the significance of the circuit breakers on the overhead panel?
They may be operational in the Emergency Electrical Configuration.
If both engine generators are powering the system, and one subsequently fails, are any busses unpowered?
No, but some loads are shed in both main galleys.
How many times can you reset a circuit breaker?
Once, if authorized by the procedures.
On the cockpit overhead panel, there is a three position EMERGENCY EXIT Light switch. What lights are associated with this switch?
Exit signs, emergency lights, and escape path lighting.
Which flight control computers are operational in the Emergency Electrical Power configuration (gear down and batteries powering the system)?
ELAC 1 and SEC 1.
If during a normal flight the BUS TIE push button is depressed to “OFF”, what effect would this have on power to the busses?
None.
While operating on Emergency Electrical Power (EMER GEN powering the system, FAC #1 reset) which of the following control laws are in effect?
Alternate.
Can you reconnect an IDG in flight?
No, it is not possible.
Which communication and navigation radios are operational in the Emergency Electrical Configuration with the EMER GEN powering the system?
ACP 1 and 2, VHF 1, HF, RMP 1, VOR 1, and ILS 1.
Both batteries are charged by the external power unit. Approximately how long does the charging process take?
20 minutes.
What would cause the GALLEY fault light to illuminate?
The load on any generator is above 100% of its rated output.
While operating on Emergency Electrical Power (EMER GEN powering the system) how is it possible to properly complete the ECAM checklist with only an upper display?
Depress and hold the specific ECAM page push button on the ECAM control panel.
After IDG disconnection why do you get a GALLEY SHED indication on the SD?
It is a reminder that the main galley has been shed automatically following the loss of one generator.
Engine #1 has just been started and the APU is inoperative. The EXT PWR push button blue ON light is illuminated. Which of the statements below is correct?
Gen #1 supplies AC bus #1 and (generally) the downstream systems; Ext power supplies AC bus #2.
In cruise, you have suddenly a Master Warning and caution comes on with ELEC EMER CONFIG and APP OFF. You notice a red FAULT light on the RAT & EMER GEN pushbutton. What do you think of this indication?
The EMER GEN is not yet supplying the system.
When are the Essential Shed buses powered by the battery?
Never. The purpose of the shed buses is to reduce the load on the batteries.
In normal electrical configuration, how is DC ESS bus supplied:
From TR 1 via DC Bus 1 and DC Bat Bus
What happens in case of total loss of main generators?
The RAT is automatically extended and powers the blue system which drives the emergency generator
DC Bat Bus can be supplied by:
DC Bus 1, DC Bus 2 or batteries
The static inverter works:
When aircraft speed is > 50 kt and on batteries only *
If a TR fails:
The other TR automatically replaces the faulty one and the ESS TR supplies the DC Ess Bus
In flight in case of loss of all main generators, emergency generator not running, the DC ESS Bus is supplied by:
Hot bus 2
If AC Bus 1 fails the AC ESS bus is supplied by:
AC Bus 2
