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American Airlines A320 Systems > Electrical > Flashcards

Electrical Flashcards

1
Q

With the GALY & CAB pb in the AUTO position and only one engine generator operating:

  • Only the second galley is shed.
  • Automatic Galley Bus shedding occurs for both the main galley and the
    second galley.
  • Only the second galley and in-seat power supply are shed.
  • Automatic Galley Bus shedding occurs for the main galley, in-seat power
    supply, and in-flight entertainment.
A

Automatic Galley Bus shedding occurs for the main galley, in-seat power supply, and in-flight entertainment.

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2
Q

True or False: A FAULT light in the GALY & CAB pb appears when any generator load is above 100% of its rated output

A

True

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3
Q

All circuit breakers on the overhead panel are associated with systems which are powered:

  • While in the emergency electrical configuration.
  • By the Hot Battery Bus.
  • By AC Bus 1.
  • By AC Bus 2
A

While in the emergency electrical configuration.

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4
Q

Color coding is used to identify circuit breakers with different characteristics.

  • Red colored circuit breakers are not monitored by the flight warning
    computers.
  • Green colored circuit breakers are monitored by the flight warning
    computers.
  • Black colored circuit breakers are always monitored.
  • All circuit breakers are always monitored by the flight warning computers.
A

Green colored circuit breakers are monitored by the flight warning computers.

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5
Q

True or False: Activation of the RAT MAN ON pb will cause immediate deployment of the RAT except when no power is on the aircraft.

A

False

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6
Q

The electrical system consists of:

  • Two aircraft batteries.
  • Two engine driven IDG’s.
  • An emergency generator.
  • All of the above.
A

All the above

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7
Q

When external power is connected to the aircraft, a green AVAIL light indicates:

A

External power is connected with acceptable voltage and frequency.

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8
Q

What are some important thing to know about the IDG Disconnect button?

A
  1. The IDG pushbutton should not be pressed for more than 3 seconds.
  2. Once disconnected, the IDG cannot be reconnected in flight.
  3. The IDG pushbutton should only be used when the engine is running
    or wind milling.
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9
Q

The RAT (RAM Air Turbine) automatically deploys when:

  • Reverting into Direct Law.
  • Airspeed is less than 125 knots.
  • Power is not available for AC Bus 1 and AC Bus 2 and airspeed greater
    than 100 knots.
  • The blue hydraulic system is powered.
A

Power is not available for AC Bus 1 and AC Bus 2 and airspeed greater than 100 knots.

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10
Q

True or False: You can deploy the RAT and activate the emergency generator using the MAN ON pb.

A

True

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11
Q

True or False: The APU generator always takes priority over an engine driven generator and/or external power.

A

False

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12
Q

The APU driven generator:

  • Can only be used for flights dispatched below 10,000 feet.
  • Will take electrical priority from an engine driven generator.
  • Can be used as the sole source of electrical power on the ground.
  • Cannot be used in flight.
A

Can be used as the sole source of electrical power on the ground.

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13
Q

True or False: When the APU generator is on and no other AC sources are available, the APU can power the entire electrical system on the ground.

A

True

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14
Q

The AVAIL light illuminated on the EXT PWR pb means:

A

Voltage and frequencies are acceptable

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15
Q

What does the OFF message under the APU GEN on the ELEC page indicate?

A

APU GEN pb has been selected OFF with the APU running

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16
Q

What electric source has priority with the engines off, APU available and the EXT PWR pb switch is ON.

  • APU GEN
  • GEN 1
  • GEN 2
  • EXT PWR
A

EXT PWR

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17
Q

Disconnecting an IDG:

  • Renders the associated electrical generator inoperative
  • Renders TR1 inoperative
  • Renders AC Bus 1 inoperative
  • Renders APU inoperative
A

Renders the associated electrical generator inoperative

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18
Q

To avoid damage to the IDG, what must not be pressed for more than 3 seconds?

A

IDG disconnect push buttons

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19
Q

The “RAT OUT” memo on the E/WD indicates:

  • The Ram Accessory Transformer has deployed
  • The RAT is powering the Green System
  • The RAT has deployed
  • The RAT has failed
A

The RAT (RAM Air Turbine) has deployed

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20
Q

AC ESS Bus ensures:

  • Essential cabin equipment is powered
  • AC Bus 1 and AC Bus 2 is powered
  • Two TRs convert AC power to DC power
  • Essential equipment will remain powered during an electrical emergency
A

Essential equipment will remain powered during an electrical emergency

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21
Q

True or False: DC ESS Bus ensures that essential DC powered equipment remains operational during an electrical emergency.

A

True

22
Q

True or False: On battery power only, the AC and DC ESS SHED Busses are shed to conserve battery life.

A

True

23
Q

The AVAIL light illuminated on the EXT PWR pb means:

A

Voltage and frequencies are acceptable

24
Q

In this ELEC page, what is providing AC power to the aircraft?

A

APU

25
Q

What source is now powering the aircraft electrical system?

A

EXT PWR

26
Q

In reference to the APU, what does this ELEC page reveal:

A

APU is running, but not powering aircraft

27
Q

What does the OFF message under the APU GEN on the ELEC page indicate?

A

APU GEN pb has been selected OFF with the APU running

28
Q

What electric source has priority with the engines off, APU available and the EXT PWR pb switch is ON.

A

EXT PWR

29
Q

What does the ELEC page reveal:

A

IDG 1 has been disconnected

30
Q

Disconnecting an IDG:

A

Renders the associated electrical generator inoperative

31
Q

To avoid damage to the IDG, what must not be pressed for more than 3 seconds?

A

IDG disconnect pbs

32
Q

The indication highlighted is displayed when the Emergency Generator:

A

Is not in use.

33
Q

The “RAT OUT” memo on the E/WD indicates:

A

The RAT has deployed

34
Q

This ELEC page reflects:

A

Electrical system is operating in the emergency electrical configuration

35
Q

The SMOKE light illuminates in GEN 1 LINE pb when:

A

Smoke is detected in the avionics ventilation duct.

36
Q

AC Bus 1 normally powers:

A

AC ESS Bus and TR 1

37
Q

AC Bus 2 normally powers:

A

TR 2

38
Q

To avoid damage to the IDG Disconnect Mechanism the IDG pbs should:

A

Only be used when the respective engine is running & Not pressed for more than 3 seconds

39
Q

A single engine driving generator:

A

Can power the entire electrical system

40
Q

The BUS TIE pb:

A

When selected OFF, will keep the APU GEN and external power from powering the entire electrical system.

41
Q

Which circuit breaker, that when tripped or pulled, will generate an ECAM “C/B TRIPPED” message.

A

Green

42
Q

The static inverter:

A
  1. Enables BAT 1 to pwer the AC ESS Bus.
  2. Automatically activate in the Emergency Electrical Configuration when the aircraft slows below 100 kts after landing.
  3. It is NOT displayed on the ELEC page
43
Q

The Emergency Generator:

A

Is powered by the hydraulic motor, which is powered by the Blue hydraulic system, which is pressurized by a Ram Air Turbine (RAT)

44
Q

According to this ELEC page:

A

BAT 1 is being charged by DC BAT bus and BAT 2 is connected to the DC BAT Bus with negligible current flow.

45
Q

According to this ELEC page, the DC ESS SHED is:

A

Powered

46
Q

Under normal operating conditions DC power is supplied by:

A

TR1 and TR2

47
Q

With the GALY and CAB pb in its normal, lights out position the main power supply to the high load ovens will shed if:

A

A single generator is powering the system in flight or a single engine driven generator only is powering on the ground.

48
Q

The BUS TIE pb:

A

When selected OFF, will keep the APU GEN and external power from powering the entire electrical system

49
Q

Prior to engine start, according to this ELEC panel:

A

External power is connected and is powering the electrical system.

50
Q

The APU generator:

A

Can power the entire electrical system by itself.

51
Q

Prior to engine start, based on these indications, you know that: >look at both panels<

A

The APU is powering the system because, although external power is connected, it has NOT been selected “ON” for use.

American Airlines A320 Systems (20 decks)

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