ELECTRIC Panel

Question 1

How do we check the battery voltage and charging system?

Answer 1

• select the ECAM ELEC page.
• place BAT 1 and BAT 2 push buttons to OFF
• check that the batt voltage is above 25.5 V
• Place BAT1 and BAT 2 push buttons to AUTO
• check that both battery charge currents drop below 60 amps within 10 seconds
• deselect the ECAM ELEC page

Question 2

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

Answer 2

• no

- battery cutoff logic prevents complete discharge when the aircraft is on the ground unpowered

Question 3

How is the BATTERY BUS normally powered?

Answer 3

o DC BUS 1

Question 4

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

Answer 4

At least 1 generator load is above 100% rated output.

Question 5

How does the GALLEY pb work in AUTO?

Answer 5

o Sheds main galley if inflight with only one generator running

Question 6

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

Answer 6

90 KVA

Question 7

What does a FAULT on the ENG GEN pb indicate?

Answer 7

o A fault is detected by the GCU or the pb is selected on but the associated engine
is not operating.

Question 8

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

Answer 8

o Prior to engine start

Question 9

What does the APU GEN FAULT light indicate?

Answer 9

o The GCU has detected a fault.

Question 10

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

Answer 10

o Allows the BUS TIE CONTACTORS to open and close automatically to
maintain power to both AC BUS 1 & 2 in the preferential order of
respective engine, ext power, APU gen, opposing engine gen

Question 11

What is the logic with the BUS TIE in the OFF position?

Answer 11

o The only power source that can be applied to AC Bus 1 and 2 is their
respective engine driven generator. EXT power, APU gen, and
opposing gen cannot power the network.

Question 12

What does IDG stand for?

Answer 12

o Integrated Drive Generator

Question 13

What is the function of the IDG?

Answer 13

o Converts variable engine speed to constant speed for optimum
generator operation.

Question 14

Is the IDG oil system separate from the engine oil system?

Answer 14

o Yes

Question 15

What cools IDG oil?

Answer 15

Fuel/Oil cooler that utilizes fuel flow from the associated engine’s fuel supply
line

Question 16

What does an IDG FAULT light indicate?

Answer 16

o Oil pressure low or high oil temperature

Question 17

What precautions must you take when disconnecting an IDG?

Answer 17

o To avoid damage to the disconnect mechanism:
 do not disconnect unless the engine is at or above idle RPM (AND)
 IDG PB should not be pressed for more than 3 seconds.

Question 18

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

Answer 18

o 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

o The AC ESS BUS is supplied by AC BUS 2.

Question 20

What does a BAT FAULT light indicate?

Answer 20

o Battery charging current is outside limits (BAT contactor opens).

Question 21

When would you expect to see the batteries connected to the BATTERY BUS?

Answer 21

o APU start
o Battery charging
o AC BUS 1 and 2 unpowered (>100KTS), and emergency generator not supplying
power.

Question 22

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

Answer 22

o EXT PWR

Question 23

What is the significance of green, red, and black circuit breakers on the flight deck?

Answer 23

o Green – Monitored by ECAM system, will generate ECAM if tripped.
o Red – Crew cannot reset (ex: Wing Tip Brakes)
o Black – not monitored, no ECAM message generated if tripped