16. ELEC Panel (Electrical) Flashcards
What is the minimum battery voltage?
25.6V
What would a pilot do if BAT voltage is 25.5 or below on originating preflight?
Charge the batteries with external power by selecting BAT pushbuttons to AUTO
How long should the batteries be charged?
20 minutes, then recheck the voltage
Explain how to conduct the BAT check. What if it fails the test?
• Select ELEC on ECAM
• Turn BAT 1 & 2 OFF then ON
• Check BAT charge current is < 60 amps and decreasing within 10 seconds
• If it fails the test, wait until the end of the charging cycle, and repeat the test
Describe the electrical power system.
• The electrical power system consists of a three-phase 115/200-volt 400hertz constant frequency AC system and a 28-volt DC
• Normally, the system produces alternating current, some of which is then transformed into direct current for certain applications.
• Each of the aircraft’s three generators can supply the whole network.
• If all normal AC generation is lost, an emergency generator can supply AC power.
• If all AC generation is lost, the system can transform DC power from the batteries into AC power.
If all AC power is lost, what happens?
DC power from the batteries is converted into AC
What would be an expected indication in the GEN pushbuttons prior to engine start?
FAULT indication
Define and describe an IDG.
Integrated Drive Generator
• Takes variable engine output and gives a constant output
How would a pilot disconnect an IDG?
Lift the red guard and push the IDG pushbutton, being careful not to hold the pushbutton for longer than three seconds.
How would an IDG be reconnected?
This cannot be done by the flight crew – it is a maintenance function
Describe the function of the BUS TIE in AUTO.
• Allows a single source to power AC BUS 1 and 2
• Allows connection of the APU GEN or EXT power to system
• Inhibits multiple sources connected simultaneously
If GEN 1 fails to supply AC Bus 1, what happens?
Gen 2 (or APU GEN if available) powers the system through the bus tie
How is the AC ESS bus normally powered?
From AC bus 1
If AC BUS 1 fails, how is the AC ESS bus powered?
AC bus 2 automatically feeds the AC ESS bus
What indication will be present on the ELEC panel that AC BUS 2 is feeding the AC ESS bus?
AC ESS FEED ALTN light illuminated only if the switch is manually selected
What does a GALLEY fault light indicate?
At least one generator load is above 100% rated output
How is the BATTERY BUS normally powered?
DC BUS 1 through the DC tie contactor
What buses are powered by the EMER GEN?
• AC ESS BUS
• AC ESS SHED
• DC ESS BUS by the ESS TR
• DC ESS SHED
