ELECTRICAL Panel

Question 1

When performing the Preliminary Cockpit Preparation, if the aircraft has not been electrically supplied for 6
hours or more, what is the minimum Battery Voltage?

Answer 1

Greater than 25.5 Volts

Question 2

What do you do if it is 25.5V or below?

Answer 2

Select BATT pb’s to ON with EXT PWR on aircraft

Question 3

How long will it take to charge the batteries?

Answer 3

20 minutes

Question 4

Will the batteries completely drain if you leave the BAT switches in AUTO after AC power is removed?

Answer 4

No. Battery cut-off logic prevents complete discharge when the aircraft is on the ground and unpowered

Question 5

How is the BATTERY BUS normally powered?

Answer 5

DC BUS 1 through a DC tie contactor

Question 6

What does the amber FAULT light in the GALLEY pb indicate?

Answer 6

At least 1 generator load is above 100% rated output

Question 7

How does the GALLEY pb work in AUTO?

Answer 7

• Sheds main galley (A319/320), all galleys (A321), and in-seat power supply if:

• Only 1 generator (APU or Engine) is available in FLIGHT, or
• Only 1 ENGINE generator is available on the GROUND

Question 8

What is the max continuous load rating of the engine and APU generators?

Answer 8

90 KVA

Question 9

What does a FAULT on the ENG GEN pb indicate?

Answer 9

• A fault is detected by the GCU, and/or

* The generator line contactor is open

Question 10

When is it normal to see the ENG GEN FAULT light illuminated?

Answer 10

Prior to engine start

Question 11

What does the APU GEN FAULT light indicate?

Answer 11

The generator line contactor is open

Question 12

When is the APU GEN FAULT light inhibited?

Answer 12

• APU speed too low

* Line contactor OPEN after EXT PWR or ENG Generator takes over

Question 13

What is the function of the BUS TIE in the AUTO position?

Answer 13

Allows the BUS TIE CONTACTORS to open and close automatically to maintain power to both AC BUS 1 & 2:
• Allows a single source to power the entire system
• Allows connection of the APU GEN or EXT PWR to the system
• Inhibits multiple sources connected simultaneously

Question 14

What does IDG stand for?

Answer 14

Integrated Drive Generator

Question 15

What is the function of the IDG?

Answer 15

Converts variable engine speed to constant speed for optimum generator operation

Question 16

What does an IDG FAULT light indicate?

Answer 16

• Oil pressure low (inhibited when N2 < 14%)
• Oil outlet temperature overheat
• Light is inhibited when IDG is disconnected

Question 17

What precautions must you take when disconnecting an IDG?

Answer 17

• Do not disconnect when the engine is not operating or windmilling
• Do not hold button longer than 3 seconds
• Only maintenance personnel can reconnect the IDG

Question 18

What is the function of the AC ESS FEED pb in the normal position?

Answer 18

If AC BUS 1 is lost AC BUS 2 automatically feeds the AC ESS BUS

Question 19

What does the AC ESS FEED pb white ALT light indicate?

Answer 19

The AC ESS BUS is supplied by AC BUS 2

Question 20

What is the purpose of the static inverter?

Answer 20

To provide AC power to the AC ESS bus from the battery when operating in the Emergency Electrical
Configuration

Question 21

When is the battery check performed?

Answer 21

During the Cockpit Prep check of the ELEC panel

Question 22

What does a BAT FAULT light indicate?

Answer 22

Battery charging current is outside

Question 23

During the Cockpit Preparation, what are we looking for on the ELEC panel BAT check?

Answer 23

• ECAM ELEC page – select
• BAT 1 & 2 – OFF then ON
• Check BATT charge current is < 60 amps and decreasing within 10 seconds
limits (BAT contactor opens).

Question 24

What are the 3 times the batteries are connected to the BATTERY BUS?

Answer 24

• APU start
• Battery charging
• AC BUS 1 & 2 not powered and airspeed below 100 knots

Question 25

What is the priority sequence for electrical power?

Answer 25

• 1. Engine Generators
• 2. EXT PWR
• 3. APU Generator
• 4. RAT Emergency Generator
• 5. Batteries

Question 26

What is the priority sequence for AC Bus 1?

Answer 26

• 1. GEN 1
• 2. EXT PWR.
• 3. APU
• 4. GEN 2

Question 27

With the APU green AVAIL light ON and the EXT PWR blue ON light illuminated, which system is powering the
aircraft?

Answer 27

EXT PWR

Question 28

What is the significance of the circuit breakers colors on the flight deck?

Answer 28

• Green – Monitored by ECAM system (System and CB TRIPPED ECAM message)
• Black – Not monitored by ECAM, may get System ECAM message)
• Red – Wing tip brake C/B (collared and cannot be pulled by Flight Crew)