Review Questions - Electrical Flashcards
What starts the battery charging cycle on the ground?
Selecting the BATT pushbuttons to AUTO with EXT PWR ON.
Charging cycle takes approximately 20 minutes
Will the batteries completely drain if you leave the BAT switches in AUTO after AC power is removed?
No. Battery cut-off logic prevents complete discharge when the aircraft is on the ground and unpowered – 22VDC
How is the BATTERY BUS normally powered?
DC BUS 1 through a DC tie contactor
DC BUS 1 is supplied from TR1
What does the amber FAULT light in the GALY & CAB pb indicate?
At least 1 generator load is above 100% rated output
How does the GALY & CAB pb work in AUTO?
a. Sheds main galley and in-seat power supply if:
b. Only 1 generator (APU or Engine) is available in FLIGHT, or
c. Only 1 ENGINE generator is available on the GROUND
What does a FAULT on the ENG GEN pushbutton indicate?
The generator line contactor is open because of a fault detected by the Generator Control Unit (GCU) which could include:
a. Overload
b. Over/under voltage
c. Differential fault (short), and/or;
d. The generator line contactor is open
What does the APU GEN FAULT light indicate?
The generator line contactor is open because of a fault detected by the GCU
What is the function of the BUS TIE in the AUTO position?
a. Allows the BUS TIE CONTACTORS to open and close automatically to maintain power to both AC BUS 1 & 2:
b. Allows a single source to power the entire system
c. Allows connection of the APU GEN or EXT PWR to the system
d. Inhibits multiple sources to connect simultaneously
What does an IDG FAULT light indicate?
OOL
a. Oil pressure low (inhibited when N2 < 14%)
b. Oil outlet temperature overheat
c. Light is inhibited when IDG is disconnected
What precautions must be taken when disconnecting an IDG?
a. Disconnect only when the engine is running or windmilling
b. Do not hold button longer than 3 seconds
How can an IDG be reset?
On the ground by maintenance
What is the function of the AC ESS FEED pushbutton in the normal position?
Allows AC BUS 1 to power the AC ESS BUS
How is AC ESS FEED transferred from AC BUS 1 to AC BUS 2?
Manually by selecting ALTN on the AC ESS FEED pushbutton or automatically if AC BUS 1 is lost and the switch is in the normal position.
What does the AC ESS FEED pushbutton white ALTN light indicate?
AC BUS 2 is powering the AC ESS BUS
What is the purpose of the static inverter?
To provide AC power to the AC ESS bus from the battery when the EMER GEN is not online when in the Emergency Electrical Configuration
How would you know if the Blower and Extract fault lights were due to smoke?
SMOKE Light on the EMER ELEC PWR Panel and an ECAM warning
