ELEC Panel ( 4 ODD) Flashcards
1
Q
What is the minimum battery voltage?
A
- 25.6V
2
Q
What would a pilot do if BAT voltage is 25.5 or below on originating preflight?
A
- Charge the batteries with external power by selecting BAT pushbuttons to
AUTO
3
Q
How long should the batteries be charged?
A
- 20 minutes, then recheck the voltage
4
Q
Explain how to conduct the BAT check. What if it fails the test?
A
- 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
5
Q
Describe the electrical power system.
A
- 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.
6
Q
If all AC power is lost, what happens?
A
- DC power from the batteries is converted into AC.
7
Q
What would be an expected indication in the GEN pushbuttons prior to engine start?
A
- FAULT indication.
8
Q
Define and describe an IDG.
A
- Integrated Drive Generator
- Takes variable engine output and gives a constant output.
9
Q
How would a pilot disconnect an IDG?
A
- Lift the red guard and push the IDG pushbutton, being careful not to hold the pushbutton for longer than three seconds.
10
Q
How would an IDG be reconnected?
A
- This cannot be done by the flight crew – it is a maintenance function.
11
Q
Describe the function of the BUS TIE in AUTO.
A
- 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
12
Q
If GEN 1 fails to supply AC Bus 1, what happens?
A
- Gen 2 (or APU GEN if available) powers the system through the bus tie.
13
Q
How is the AC ESS bus normally powered?
A
- From AC bus 1
14
Q
If AC BUS 1 fails, how is the AC ESS bus powered?
A
- AC bus 2 automatically feeds the AC ESS bus.
15
Q
What indication will be present on the ELEC panel that AC BUS 2 is feeding the AC ESS bus?
A
- AC ESS FEED ALTN light illuminated only if the switch is manually selected.
