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System 2 > Electrical (SYS4) > Flashcards

Electrical (SYS4) Flashcards

1
Q

What does the External Power AVAIL light indicate when illuminated?

A

External power is plugged in and power quality is acceptable

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2
Q

When selected manually, what electrical power source will trip off any existing power source?

A

External Power

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3
Q

What does an illuminated APU Generator OFF light indicate?

A

With the APU running, the APU generator breaker was commanded to close but remained open because of a fault or the APU Generator Control switch is selected OFF

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4
Q

What does a Generator OFF light indicate when illuminated?

A

The Generator Control Breaker is open

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5
Q

What does an illuminated Generator DRIVE light indicate?

A

High oil temp or low oil pressure

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6
Q

When can a disconnected IDG be reconnected?

A

Only on the ground by maintenance

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7
Q

What happens during an AUTOLAND if one of the Generators fails below 200’ RA?

A

Autoland will continue. Loss of associated Autopilot will occur and the ASA will NOT change from LAND 3

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8
Q

What is the purpose of the Bus Tie System in AUTO?

A

Provides power to both main AC buses, Prevents paralleling of electrical sources, Isolates faults, Allows the DC Bus Tie Breaker to close with the loss of DC power, Allows the CA and FO’s flight instruments to remain powered with the loss of the respective AC bus

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9
Q

What is the power source priority for powering left and right main buses?

A

Respective IDG, APU, opposite IDG

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10
Q

What happens to the Electrical System when the engines are started with external or APU electrical power in use?

A

The IDG automatically powers the respective main bus and the previous power source is disconnected from that bus

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11
Q

What does an illuminated AC Bus ISLN light indicate when the Bus Tie switch is in the AUTO position?

A

A fault has occurred automatically opening the AC bus tie breaker

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12
Q

With a Left AC bus fault, will the CA’s Flight Instruments fail?

A

No. They will automatically be powered from the right main AC bus

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13
Q

With the Bus Tie Switches in AUTO, what happens to a DC bus if its respective T/R fails?

A

Powered by the opposite DC bus through the DC Bus Tie Breaker

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14
Q

What items are normally powered by the Ground Handling Bus?

A

Fueling and Cargo handling

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15
Q

How is the Ground Handling Bus powered?

A

External power connected to the aircraft or from the APU Generator

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16
Q

What is the main source of power for the Aircraft Battery Charger?

A

Ground Service Bus

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17
Q

What items are normally powered by the Ground Service Bus?

A

Aircraft battery charger, APU battery charger, and misc cabin/system loads

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18
Q

What is the normal source of power for the Ground Service Bus?

A

Right main AC bus

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19
Q

What normally powers the left and right utility buses?

A

Their respective main AC bus

20
Q

What conditions would cause Utility bus load shedding?

A

Both Thrust Levers advanced to takeoff range on the ground with single power source, Overload, Starting Engines with the APU providing electrical power, and Single Generator source in flight

21
Q

What happens to the utility busses when a single engine generator is powering the electrical system and an additional power source becomes available?

A

Electrical power is automatically restored to the Utility Buses

22
Q

What is the purpose of Automatic Load Shedding?

A

To ensure power is available to essential equipment

23
Q

What is the function of the OFF position of the STBY power selector?

A

Unpowers the standby busses

24
Q

What is the function of the BAT position of the STBY power selector?

A

Powers STBY Buses from the main battery

25
Q

How is the STBY DC bus normally powered?

A

The Left T/R powers the Standby DC Bus

26
Q

How is the STBY AC bus normally powered?

A

The left AC system powers the Standby AC Bus

27
Q

How is the STBY AC bus powered during standby power operations?

A

With the battery switch on and the standby power selector in AUTO, the main battery powers the Standby Inverter which provides AC power to the standby bus

28
Q

What electrical component is capable of providing temporary power to the Standby Power System should a loss of all generators occur?

A

Main Battery

29
Q

How long is the Aircraft Battery capable of powering the Standby Power System?

A

30 Minutes

30
Q

What causes a Standby Power Bus OFF light to illuminate?

A

Standby AC and/or DC Bus is not powered

31
Q

What does positioning the Generator Control switch to ON provide?

A

Arms the generator breaker to close when proper generator output is available

32
Q

What does positioning the Generator Control switch to OFF provide?

A

Opens field and generator breaker and resets fault trip circuitry

33
Q

What major items remain powered when operating on Standby Power?

A

Right IRU, Fuel indications, Manual pressurization and indicators, STBY flight instruments, Alt stab trim, Left VHF comm, and Center ILS

34
Q

What are the alternate sources of power for the ground service bus?

A

The APU generator or External Power

35
Q

How many batteries are installed?

A

2

36
Q

What are the sources of main AC power?

A

L and R IDGs and the APU generator

37
Q

The ground handling bus can only be powered via:

A

APU or ground power

38
Q

What powers the lower cargo doors?

A

Ground handling bus

39
Q

During Autoland, what is the case regarding bus power

A

The buses isolate to allow independent sources of power for the autopilots

40
Q

Where are the cockpit controls for the main DC electrical system located?

A

There are no cockpit controls for main DC

41
Q

How are the main busses powered if the right engine is started with this panel configuration?

A

The right engine generator automatically powers the right main bus

42
Q

The APU is operating. What powers the right main bus if the right engine is shut down with the panel configured as shown?

A

The APU generator powers the right main bus

43
Q

The APU is not running. What powers the left main bus with this panel configuration and indications?

A

The right engine generator powers the left main bus

44
Q

With the APU operating, what automatic switching will occur if you turn the APU GEN off with this panel configuration?

A

The main buses lose power

45
Q

What is the primary source of DC power during normal flight?

A

Transformer Rectifiers

46
Q

When does the battery/standby bus normally power the center autopilot?

A

During autocoupled ILS approaches

47
Q

What is the primary power source for the AC transfer busses?

A

Main AC busses

System 2 (7 decks)

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