SH 6 - Electrical

Question 1

1) What starts the battery charging cycle on the ground?

Answer 1

With external power on, select the batteries to Auto. Takes approx 20 mins.

Question 2

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

Answer 2

No, automatic cut off logic prevents batteries from completely discharging when on ground

Question 3

3) How is the BATTERY BUS normally powered?

Answer 3

Transformer rectifier (TR1)

Question 4

4) What does the amber FAULT light in the GALY & CAB pb indicate?

Answer 4

Load on any generator is more than 100% rated output

Question 5

5) How does the GALY & CAB pb work in AUTO?

Answer 5

Supplies main and secondary galley, in seat power & IFE system. Auto shed with only one generator operating.

Question 6

6) What does a FAULT on the ENG GEN pushbutton indicate?

Answer 6

Associated GCU trios or line contactor opens

Question 7

7) What does the APU GEN FAULT light indicate?

Answer 7

Associated GCU or contact opens.

Inhibited when contact opens after external power or ENG GEN takes over or APU speed too low

Question 8

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

Answer 8

Bus tie connectors close when on OEI or on APU or external power. Auto open when both engines running.

Question 9

9) What does an IDG FAULT light indicate?

Answer 9

IDG oil outlet overheats or IDG oil pressure low.

Question 10

10) What precautions must be taken when disconnecting an IDG?

Answer 10

Only MX can reconnect

Question 11

11) How can an IDG be reset?

Answer 11

Only by Mx on the ground

Question 12

12) What is the function of the AC ESS FEED pushbutton in the normal position?

Answer 12

AC ESS BUS supplied by AC Bus 1

Question 13

13) How is AC ESS FEED transferred from AC BUS 1 to AC BUS 2?

Answer 13

Pushing AC ESS FEED pb

Question 14

14) What does the AC ESS FEED pushbutton white ALTN light indicate?

Answer 14

AC ESS BUS being powered by AC Bus 2. Occurs automatically if AC Bus 1 lost and switch in auto, lights out position.

Question 15

15) What is the purpose of the static inverter?

Answer 15

Transform DC power from Battery 1 into AC power (to supply AC Ess Bus).

Question 16

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

Answer 16

• APU starting
• Battery voltage below 26.5V (battery charging)
• Loss of AC Bus 1 & 2 (Below 100kts when emer gen not supplying)

Question 17

17) What is the priority sequence for electrical power (GEARB)?

Answer 17

G - Generators (engine)
E - External power
A - APU generator
R - RAT emergency generator
B - Batteries

Question 18

18) What is the significance of the green and red collared circuit breakers on the Flight Deck?

Answer 18

Green are ECAM monitored

Red do not allow reset

Question 19

19) What buses are powered by the emergency generator?

Answer 19

AC ESS BUS
AC ESS SHED BUS
DC ESS BUS & DC ESS SHED BUS (ESS TR)

Question 20

20) What is the function of the MAN ON pb on the EMER ELEC PWR Panel?

Answer 20

Extends RAT manually

Question 21

21) How long does it take the RAT to extend and provide power?

Answer 21

8 seconds (3 seconds for extension, and 5 seconds to pressurize the blue hydraulic
system and power the EMER GEN)

Question 22

22) What does the red RAT & EMER GEN fault light on the EMER ELEC PWR Panel indicate?

Answer 22

When emergency generator is not supplying power (AC BUS 1 & 2 are not powered)

Question 23

23) What powers the emergency generator?

Answer 23

Blue hyd system

Question 24

24) What is the difference in functionality of the MAN ON pb (EMER ELEC PWR Panel) and the RAT MAN ON pb (HYD Panel)?

Answer 24

No difference

Question 25

25) What happens when you push the GEN 1 LINE pushbutton?

Answer 25

Gen 1 line contactor opens

Question 26

26) When is the GEN 1 Line pushbutton used?

Answer 26

In smoke procedure to power AC Bus 1 from Gen 2

Question 27

27) What does the amber SMOKE light in the GEN 1 LINE pushbutton indicate? (On EMER ELEC PWR panel)

Answer 27

Smoke detected in avionics bay

Question 28

28) How would you know if the Blower and Extract fault lights were due to smoke?

Answer 28

When both have FAULT illuminated. Also have SMOKE on GEN 1 LINE pb.