Electrical Flashcards

1
Q

The AC ESS BUS normally feeds from? Can it feed from another source?

A

AC BUS 1 Yes, AC BUS 2

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2
Q

When GALY & CAB is in the normal position,what are powered?

A

Main and secondary galleys powered.

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3
Q

When the EXT PWR light is ON it means?

A

Ground Power is connected to the plane’s systems

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4
Q

The BUS PRIORITY is?

A

ENG GEN, EXT PWR, APU GEN, OFFSIDE

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5
Q

In flight with one generator only, the main galley will be automatically?

A

Shed!

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6
Q

A BATT 1(2) FAULT light means?

A

Charging current outside limits.

Contactor opens

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7
Q

The AC ESS FEED ALTN will light when?

AC ESS BUS is then powered by?

A

Only when pushed.

AC BUS 2

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8
Q

The BUS TIE’s in AUTO mean?

A

Bus tie contactors open and close to supply AC buses.

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9
Q

When APU GEN selected OFF what happens?

A

Line contactor opens, fault reset

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10
Q

When AFT AVIONICS selected OFF what happens?

A

Removes power from Aft Avionics Rack, Live TV, WADL, XM Radio

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11
Q

A GEN 1(2) FAULT will light when?

Is this normal before engine start?

A
  1. Gen control unit or GCU has tripped
  2. Line contactor opens

Yes

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12
Q

The AC ESS FEED FAULT light means?

A

The AC ESS BUS is not powered

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13
Q

A GALY & CAB FAULT light means?

A

A load on any GEN is more than 100%

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14
Q

COMMERCIAL selected OFF

A

Commercial loads are turned off Cargo, cabin, galley, water, toilet, drain mast heat

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15
Q

GEN 1(2) selected OFF Will this reset the fault circuit?

A

Line contactor opens Yes

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16
Q

The EXT PWR AVAIL (Green) light means? When does the AVAIL (Green) light go out?

A

Power is connected and good. If ON is lit or power disconnected

17
Q

An APU GEN FAULT light means?

A
  1. A Gen control unit has tripped
  2. Line contactor has opened (except if GEN selected OFF)
18
Q

The BATT 1(2) pb controls?

A

The Battery Charge limiter by connecting and disconnecting the BATT to DC BATT BUS

19
Q

BATT 1(2) selected OFF means?

Is the DC BATT BUS powered with a BATT 1(2) OFF light?

Are the HOT BUSES powered with a BATT 1(2) OFF light?

A

Charge limiter is off.

Yes

Yes

20
Q

An IDG FAULT light means?

A

Oil overheat or low oil pressure

21
Q

A GEN 1 LINE SMOKE light indicates?

A

Smoke in the Avionics Ventilation Duct

22
Q

When GEN 1 LINE is selected off what happens to the GEN 1?

How is AC BUS 1 Powered?

Are the Main fuel pumps still powered?

A
  1. GEN 1 line contactor opens
  2. AC BUS 1 is powered from GEN 2
  3. Yes, 1 in each main tank