Electrics

Question 1

Explain sources of electrical generation and their priorities

Answer 1

GEARB

Question 2

What does the EMER Gen power?

Answer 2

AC ESS BUS and DC ESS BUS

Question 3

Approximately how long does it take for the emergency generator to come online?

Answer 3

8 seconds

Question 4

When waiting for the emergency generator to deploy, what is powering the aircraft?

Answer 4

Batteries

Question 5

With EMER ELEC, what is powered on the flight deck before the emergency generator is deployed?

Answer 5

PFD1, ND1, Upper DU, FMGC1

Question 6

What is the purpose of generator 1 line on the overhead?

Answer 6

Turning it off keeps generator 1 still running but AC BUS is being powered by GEN2. This allows the fuels pumps to be powered separately.

Question 7

Approximately what speed must be maintained for the RAT?

Answer 7

140kts

Question 8

What is the difference between selecting the generator off and the IDG off?

Answer 8

Gen 1 turns the generator 1 off and is reversible. IDG disconnects the IDG and isn’t reversible in flight

Question 9

What is the purpose of selecting APU master switch on in the smoke configuration checklist?

Answer 9

It enables the flight crew to manually control the outflow valve that is powered by the DC BAT BUS.

Question 10

Under what circumstances will the RAT extend automatically?

Answer 10

AC BUS 1 and AC BUS 2 fail

Question 11

At what altitude can the APU be started in the EMER ELEC configuration and why?

Answer 11

25000ft or below - denser air, more likely to start.

Question 12

Under normal operations, what altitude can the APU support electric load and bleed demand?

Answer 12

Any altitude for electrical load, 22500ft for single pack bleed demand

Question 13

How do you convert AC to DC and DC to AC

Answer 13

AC to DC with TR
DC to AC with Static Inverter

Question 14

Why a generator is AC

Answer 14

Constantly changing current (alternating)

Question 15

Discuss AC ESS BUS fault

Answer 15

Lose PFD and ND 1 and Upper DU so CM2 is PF.

Single DU display so you have to push and hold the system page.

Question 16

Discuss AC2 BUS Fault (I.e. what happened to the screen, AP etc.

Answer 16

You lose PFD and ND 2, Lower DU.

As the lower DU is lost, you have to push and hold the system button

Question 17

With the loss of TR1, what powers DC ESS Bus?

Answer 17

AC ESS through the ESS TR

Question 18

In normal config, what powers DC ESS BUS and what if AC BUSS 1 fails?

Answer 18

DC BUS 1.

AC ESS BUS through the ESS TR

Question 19

What power does the generator give?

Answer 19

AC power

Question 20

What powers the DC ESS BUS?

Answer 20

DC BUS 1

Question 21

You’re in EMER ELEC. Can you start the APU

Answer 21

Yes, after 45s and below 25,000ft

Question 22

DC ESS Fault Key Points

Answer 22

AP1 INOP so use AP2
VHF 1 INOP, retune Freq on VHF2 on RMP2
Turn VHF transmit and audio Pb on RMP 3
Switching panel to FO 3 & CM1 speaker loud
Blue HYD lost and indicators on other systems but triangles and white title indicate green and blue have pressure
Shutdown engine on stand with the fire Pb