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Atmosphere 320 > Electrics > Flashcards

Electrics Flashcards

1
Q

What does the commercial pb control?

A
  • Cabin and cargo lights
  • Water and toilet system
  • Drain mast ice protection
  • Galleys
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2
Q

What does the GEN 1 LINE pb do?

A

Isolates GEN 1 from AC BUS 1

The number 1 fuel pumps in both inner tanks are now connected directly to GEN 1 (normally to AC BUS 1) to avoid gravity fuel feeding

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3
Q

When are the main galleys shed?

A

When only one generator is operating in flight
(or on the ground when the aircraft is being supplied by 1 engine generator only)

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4
Q

After the loss of AC BUS 1 and 2, how long does it take for RAT extension and emergency generator coupling?

A

8 seconds

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5
Q

What restrictions are there on the operation of the red guarded IDG pb?

A

Do not press for more than 3 seconds as it may damage the disconnect mechanism. The IDG should only be disconnected on a running or windmilling engine.

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6
Q

What systems are lost with an AC BUS 2 FAULT?

A

FO PFD, ND and SD (Lower DU)

MCDU 2
Reverser 2
Y ELEC Pump
RA 2

And loads more!

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7
Q

What systems are lost with an AC BUS 1 FAULT?

A

Reverser 1
RA 1
BLUE ELEC Pump (And thus B sys)

And loads more!

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8
Q

What systems are lost with an AC ESS BUS FAULT?

A

CPT PFD, ND and E/WD (Upper DU)

MCDU 1
Pax Oxygen Masks
APU Fuel Pump

And loads more!

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9
Q

What systems are lost with a DC ESS BUS FAULT?

A

BLUE ELEC Pump (And thus B sys)
ACP 1+2
A/THR
VHF 1
AP1
HP Fuel Shutoff Valves

Even if the ECAM Status page displays CAT 3 SINGLE ONLY, the real landing capability of the aircraft is CAT 2, due to the inoperative A/THR Once the approach mode is armed, the FMA displays the correct landing capability CAT 2.

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10
Q

Which screens are lost in EMER ELEC?

A

FO PFD, ND and SD (Lower DU)

Same as AC BUS 2 FAULT

Look at QRH ELEC EMER CONFIG SYS REMAINING

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11
Q

What is the reconfiguration of the electrical system in a double TR fault?

A

The ESS TR powers the DC ESS BUS from the AC ESS BUS. As both TRs are lost; DC BUS 1, DC BUS 2, and the DC BAT BUS are lost.

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12
Q

What is the reconfiguration of the electrical system in a single TR fault?

A

The ESS TR automatically replaces the faulty one through the AC ESS BUS, and powers the DC ESS BUS. DC BUS 2 powers the DC BAT BUS and DC BUS 1 (in a TR1 fault)

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13
Q

What is the configuration of the electrical system in emergency electrical configuration in flight?

A

The EMER GEN (RAT, blue hydraulic system) supplies the AC ESS BUS, and the ESS TR. This supplies the DC ESS BUS.

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14
Q

What is the configuration of the electrical system in emergency electrical configuration if the RAT stalls or on the ground below 100 kts?

A

The EMER GEN has nothing to drive it. The batteries supply the electrical system via the static inverter. AC SHED ESS BUS and DC SHED ESS BUS are lost.

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15
Q

What happens below 50 kts on the ground in the emergency electrical configuration?

A

The AC ESS BUS is automatically shed, leading to the loss of all DUs.

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16
Q

In normal electrical system config, which side has a higher load?

A

IDG1 has approx 10% higher load as:
- AC 1 powers AC ESS
- DC 1 powers DC BAT which powers DC ESS

17
Q

What is the Bus Tie?

A

The bus tie allows power to be transferred between each side of the electrical system.
It allows the APU Gen to power both sides.

18
Q

What happens in time between AC bus failure and Emergency generator taking over?

A

Takes 8 secs for Emer Gen to come online.
In mean time:
Battery 1 powers AC ESS through Static Invertor
Battery 2 powers DC ESS

19
Q

QRH ELEC procedures?

A

ELEC EMER CONFIG Summary
ELEC EMER CONFIG Sys Remaining
C/B TRIPPED

20
Q

3 occasions batteries connect to BAT bus?

A

APU battery start
Flight on batteries only
Recharge cycle

21
Q

3 types of CB?

A

Monitored - green (ECAM after 1 min)
Unmonitored - black
Cannot be reset - red sleeved (WTB)

22
Q

What is the reconfiguration of the electrical system in an AC Bus 1 fail?

A

AC ESS bus is powered by AC 2 via the AC Essential Feed (automatic)
AC ESS powers DC ESS through ESS TR
DC 2 powers DC1 through DC BAT Bus (5 second delay)
{How to remember - DC BAT bus can only power one other bus so can’t power DC 1 AND DC ESS - ESS TR comes online}

23
Q

Consequences of a TR 1+2 failure?

A

Lose DC 1, DC 2 and DC BAT.
{ESS TR can only power DC ESS}

24
Q

What is the difference between EMER ELEC CONFIG and SMOKE CONFIG?

A

Initiated by pilots to isolate smoke causing electrical equipment.
1 fuel pump stays on in each inner tank so gravity feed not required
Expected to return electrics to working condition before landing (reversible) - restores reversers, normal brakes, NWS, screens etc

25
Q

How can you look up what will power what in the event of various electrical failures?

A

FCOM Distribution Table (Bookmarked in Docunet)

26
Q

When does the RAT automatically deploy?

A

AC BUS 1 and AC BUS 2 lost and aircraft speed >100kt

27
Q

In the event of RAT stalling or aircraft on ground and <100kts, what powers what electrically?

A

HOT BUS 1 powers AC ESS via STATIC INV
HOT BUS 2 powers DC ESS

AC SHED ESS and DC SHED ESS are shed

When on ground and <100 kts, DC BAT BUS connects to batteries
When on ground and <50kts, AC ESS BUS shed leading to loss of all DUs

28
Q

Describe the battery check during Prelim Cockpit Preparation

A

If batteries not been powered for >6h:
- With batteries off, check >25.5V
- This ensures charge >50% & is min for APU Test & start. If do APU Test when <25.5v, could discharge fire ext. bottle
- If below 25.5V, switch to AUTO & EXT PWR on. Charge for 20 mins then recheck.

29
Q

Describe the battery check during Cockpit Preparation

A
  • BAT 1 and BAT 2 pb OFF then ON
  • Initiates charging cycle
  • Check 10 sec after pb ON that current is <60A and decreasing
  • If not, wait until charging complete and then recheck
30
Q

Actions and consequences of a tripped CB

A

QRH CB Tripped
Basically says if on ground call Maintrol. Never reset fuel pump CB. If in flight, don’t reset unless you have to and only reset once.

If a monitored CB trips and press CLR, all CBs on that panel now unmonitored unless reset the CB.

If a monitored CB trips and use EMER CANC, all CBs unmonitored.

31
Q

Why do you reset the generators on approach in SMOKE config?

A

Restores reversers, normal brakes, NWS, screens etc

May still land in ALTN/DIRECT LAW due IR 2 and IR 3 being unpowered in SMOKE config.
Note at end of ELEC EMER CONFIG SYS REMAINING table says can keep IR3 powered with ATT-HDG Selector switching which may lead to retaining NORMAL LAW.
This would reduce landing distance required (DIRECT LAW landing - CONF 3 only and VREF + 10/15 kt (depending on A/C type)

32
Q

How much flight time when on batteries only?

A

> 30 mins

Atmosphere 320 (21 decks)

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