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DL 7ER > Electrical > Flashcards

Electrical Flashcards

0
Q

What are the sources of main AC power?

A
  • external power
  • APU generator
  • engine driven generators
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1
Q

Where is the GROUND SERVICE bus switch located?

A

In the cabin on the forward flight attendant panel.

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2
Q

On Hydraulic Driven Generator equipped aircraft, when does the HDG activate?

A

Activates automatically when both the left and right main AC busses are unpowered.

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3
Q

When equipped, what powers the Hydraulic Driven Generator on a 767?

A

Center hydraulic system.

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4
Q

When equipped, what powers the Hydraulic Driven Generator on a 757?

A

Left hydraulic system.

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5
Q

What components are powered by the ground service bus?

A
  • main battery charger
  • APU battery charger
  • miscellaneous cabin and system loads
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6
Q

How can the ground handling bus be powered?

A
  • Can be powered only on the ground, and only from the APU generator or from the external power source. (AVAIL light illuminated)
  • To accept late bags after pushback, a 757 must have APU power to operate cargo doors. A 767 can use the manual bulk cargo door, or if electric door operation is desired, a 767 also requires APU power.
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7
Q

What is the function of the Battery (BAT) switch?

A

In an unpowered airplane on the ground, a few annunciator lights illuminate and allows the APU to be started

In a powered airplane in flight or on the ground, when AC power is removed or lost, the standby and battery busses are powered

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8
Q

How long will the battery last on standby power?

A

30 minutes minimum, powering standby AC and DC busses.

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9
Q

On a 767 without an operating hydraulic driven generator, how are gear extension and flap operation affected if battery power is lost?

A

The flaps and gear CANNOT be extended.

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10
Q

Where can you find which major systems are NOT available when operating on HDG power?

A

In the QRH.

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11
Q

What does an amber utility bus OFF light mean?

A

The utility and galley busses are unpowered.

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12
Q

What are the conditions that cause the utility busses to load shed?

A
  • both thrust levers advanced on the ground with a single power source
  • system overload
  • single generator operation in-flight
  • starting engines with the APU providing electrical power
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13
Q

When galley power sheds, is there any indication?

A

No. Galley busses can shed without illumination of the utility bus lights.

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14
Q

What do external power AVAIL and ON lights indicate?

A

AVAIL (white)- external power is plugged in and power quality is acceptable.

ON (white)- external power is powering the bus or busses.

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15
Q

What is indicated by an amber AC BUS OFF light?

A

The associated AC bus is unpowered.

16
Q

What causes an amber illuminated generator DRIVE light?

A

HOT-LOP in the generator drive

  • High Oil Temperature
  • Low Oil Pressure
17
Q

Explain the meaning of an illuminated APU generator OFF light on the overhead electrical control panel.

A

The APU generator breaker is open because of a fault with the APU running or the APU generator control switch is selected OFF.

18
Q

What does an amber battery discharge DISCH light mean?

A

The main battery is discharging.

19
Q

What does an amber illuminated standby power bus OFF light mean?

A

Standby AC and/or DC bus not powered.

20
Q

How does the Standby Power Selector work?

A
  • OFF- standby busses are unpowered
  • AUTO- standby busses transfer to battery power if normal AC power is lost
  • BAT- the standby busses are powered from the main battery
21
Q

Explain the function of the generator control switch.

A

ON (bar in view)- arms the generator control breaker to close automatically when generator power is available.

OFF (bar not visible)- opens generator control breaker and resets fault trip circuitry.

22
Q

Explain the function of the bus tie switches.

A

Provides power to both main AC and DC busses, and isolates faults.

23
Q

On the 767, what does the FLT INSTR BUS PWR switch do?

A

ALTN- allows hydraulic driven generator to power FO’s flight instruments

OFF (ALTN not visible)- allows hydraulic driven generator to power captain’s flight instruments

DL 7ER (17 decks)

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