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Kalitta 747-400 Systems > Chapter 6 - Electrical > Flashcards

Chapter 6 - Electrical Flashcards

1
Q

The left PFD, ND, and FMC are normally powered by?

A

The APU Standby Bus

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2
Q

Under normal operation, what powers the MAIN and APU Standby buses?

A

• Main Standby is powered by AC 3

• APU Standby is powered by the Captain’s Transfer Bus, which is normally powered by AC 3

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3
Q

What is the source of power to the APU Standby bus with a loss of AC bus 3?

A

The Captain’s Transfer bus, which is now powered by AC 1

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4
Q

What causes DISC to illuminate in the IDG Disconnect Switch?

A

• High Oil Temperature

• Low Oil Pressure

• Uncorrectable frequency fault

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5
Q

Do the AC BTBs and DCIRs open at any time when there is no cockpit annunciation?

A

Yes, during a triple autopilot coupled approach

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6
Q

What will power the Main Deck Cargo Handling bus with both APU generator 2 and External Power 2 available?

A

External Power 2 has priority over the APU generator

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7
Q

You are being released to a destination where a Category III approach is to be conducted. Enroute, the number 4 Generator has been disconnected. Can you still conduct a category III approach?

A

Yes

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8
Q

How can you manually open the number 4 DCIR?

A

Open the number 4 bus tie switch

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9
Q

You are conducting your cockpit setup. Inspecting the overhead maintenance panel, you notice that the number 1 generator field OPEN light is illuminated. There are no discrepancies in the logbook. How can you reset the generator field?

A

Cycle the number 1 generator control switch off, then on

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10
Q

The aircraft is dark. External power is available to the left side of the Synch Bus. Can you light your path to the cockpit? How?

A

• Yes.

• First, connect the Ground Service Bus to the Ground Handling Bus with the switch adjacent to the L1 door.

• Second, select the Flight Deck Access Light switch next to the Ground Service switch to ON.

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11
Q

What are the main AC electrical power sources?

A

4 IDGs

2 APU generators

2 External power sources

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12
Q

What is the power output capability of the IDGs?

A

115 Volt AC, 3 Phase, 400 Hz, at 90 KVA

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13
Q

Describe the function of the Split System Breaker (SSB).

A

Divides the synchronous bus, allowing each side of the AC electrical system to be powered by separate auxiliary or external power sources.

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14
Q

What does a Bus Isolation (ISLN) light illuminated indicate?

A
  • BTB open
  • AC bus isolated from synchronous bus
  • Opens related DC isolation relay (DCIR) isolating the respective DC Bus from the DC Tie Bus
  • resets fault logic circuitry
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15
Q

What happens when you push a Generator Drive Disconnect (DRIVE DISC) switch?

A

Disconnects IDG from engine
Opens related Generator Control Breaker (GCB)

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16
Q

What is the function of the Standby Power Switch in the AUTO Position?

A

Allows the main and APU standby busses to be powered from available sources.

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17
Q

What does a Generator DRIVE light indicate?

A

Low oil pressure
High oil temperature
Uncorrectable generator frequency fault

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18
Q

What does the OFF position of the Standby Power Switch do?

A
  • Standby power not available
  • Main and APU standby buses disconnected from all power sources
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19
Q

What does the ON position of the Battery Switch provide?

A
  • Main battery available as backup power source for main battery bus and main standby bus
  • APU battery available as backup power source for APU battery bus and APU standby bus
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20
Q

What are some of the equipment items powered by the Utility buses?

A

Forward main fuel pumps 2 and 3
Forward override/jettison fuel pumps 2 and 3
Center override/jettison fuel pump
Galley equipment (Freighter)

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21
Q

Describe the electrical load shedding process.

A

Utility bus loads are shed one at a time through ELCUs in a programmed sequence until the overload condition is relieved.

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22
Q

What is an ELCU?

A

Electrical Load Control Unit that protects the electrical system from utility bus faults and provides load management through automatic load shedding.

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23
Q

What Utility Busses does the the left and right Utility Power Switch control?

A
  • L controls 1 +2
  • R controls 3 +4
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24
Q

What does the “AVAIL” light indicate on the External and APU PWR switches?

A

The related power source (APU or EXT) is plugged in and available, the power quality is acceptable.

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25
Q

What bus is powered on the ground when APU generator 1 or External power 1 is available?

A

Ground handling bus

26
Q

When is the main cargo deck handling bus powered?

A

When the “AVAIL” light is displayed on the APU 2 or EXT 2 switches.

27
Q

What electrical power source would you select if cargo handling is required?

A

APU GEN 1 or EXT PWR 1

28
Q

Describe the electrical system sequence of events during engine start with the SSB open.

A

 The IDG powers its side of the synchronous bus when voltage and frequency are acceptable.
 The previous power source is disconnected.

29
Q

Describe the electrical system sequence of events with a single power source powering the synchronous bus, when an engine is starting., SSB closed.

A

 The IDG powers the entire synchronous bus when voltage and frequency are acceptable.
 The SSB remains closed and the original power source is disconnected

30
Q

How is DC power provided by the electrical system?

A

 Four transformer‐rectifier units (TRUs) produce DC power, each TRU powered by its related AC bus.
 Four DC busses are connected through DC isolation relays (DCIRs) to the DC tie bus.
 Battery busses distribute DC power in addition to the four main DC busses

31
Q

What is the normal source of power for the main standby bus?

A

AC bus 3

32
Q

How does the main standby bus get power if AC bus 3 becomes unpowered
in flight, all other conditions normal?

A

The main standby inverter powers the main standby bus, through the main battery charger, through the main hot battery bus (the main battery normally powered by AC bus 1 through the ground service bus.)

33
Q

What bus powers the APU standby bus?

A

The Captain’s transfer bus

34
Q

Which bus powers the Captain’s transfer bus and the main standby bus?

A

AC bus 3

35
Q

If both AC bus 3 and AC bus 1 are not powered, all other conditions normal,
how is the main standby bus powered, and for how long can it be powered?

A

The main standby inverter powers the main standby bus, from the main battery through the main hot battery bus. (since the battery charger is unpowered, the main battery can provide power to the main standby bus for a minimum of 30 minutes).

36
Q

Which bus powers the First Officer’s transfer bus?

A

AC bus 2

37
Q

Which bus provides backup power for both transfer busses?

A

AC bus 1

38
Q

What are some of the equipment items powered by the ground service bus?

A

 Main and APU battery chargers
 Fuel pumps for APU start
 Flight deck flood, navigation, and service lights
 Miscellaneous service outlets and equipment

39
Q

What are some of the equipment items powered by the ground handling
bus?

A

 Lower cargo handling equipment and compartment lights
 Fueling system
 Auxiliary hydraulic pump 4

40
Q

What does the Bus Tie switch in AUTO do?

A
  • Arms automatic AC bus tie circuitry
  • Closes related DC isolation relay
41
Q

What does the BUS TIE switch in the OFF position do?

A
  • opens AC bus tie breaker and related DC isolation relay
  • resets fault log circuitry
42
Q

With the Bus Tie Breaker in the AUTO position with BUS ISOLATION (ISLN) Light ON, what does this mean?

A
  • AC bus tie breaker open
  • AC bus isolated from syncronous bus
  • DCIR is still closed
43
Q

What does turning the BATTERY switch OFF do?

A

Disconnects main and APU batteriers from related battery buses.

44
Q

How long will the Standby Power System last on Battery Power only?

A

30 Minutes

45
Q

How is electrical load shedding indicated to the crew?

A

EICAS messages for individual systems such as fuel pumps being shed

46
Q

The nose cargo door can be opened when?

A

EXT PWR 2 AVAIL light is illuminated

47
Q

The External Power 1 ON light, no electical faults and all switches normal, how are DC Busses 1-through 4 powered?

A

Connected together by the DC tie bus.

48
Q

What does a GENT CONT OFF light indicate?

A

A generator control breaker (GCB) is open

49
Q

While accomplishing the TERMINATING Checklist, when should the BATTERY switch be selected to OFF?

A

Minimum of 2 minutes after the APU shuts down

50
Q

The BUS TIE ISLN light on the overhead panel indicates?

A

An AC bus tie breaker (BTB) is open.

51
Q

Assuming no other failures and all switches in normal positions, a fault on the AC bus 4 rendering it unpowered would?

A

Leave DC bus 4 powered via the DC tie bus.

52
Q

The Ground Handling Bus should be powered if?

A

EXT PWR 1 AVAIL light is illuminated

53
Q

Electrical bus isolation, occurring during autoland, involves the following?

A

AC busses 1, 2, and 3 are isolated. AC bus 4 powers the sync bus.

54
Q

What is the normal power source for the Main Standby Bus?

A

AC Bus 3

55
Q

Which AC bus serves as the primary back-up power source for both the Captain’s and FO’s Transfer Buses?

A

AC Bus 1

56
Q

What does the BAT position of the Standby Power Switch do?

A
  • powers main battery bus from main battery through the main hot battery bus (with battery switch ON)
  • powers APU battery bus from APU battery through the APU hot battery bus (with battery switch ON)
  • disables main and APU battery chargers
  • powers main and APU standby bussess form their related batteries through their hot battery bussess and standby inverter (with Battery switch ON)
57
Q

What does the amber UTILITY OFF light indicate?

A
  • power removed from related ELCUs by fault protection logic, or
  • related Utility Power switch OFF
58
Q

What does the EXT PWR (AVAIL) light illuminated (white) indicate?

A
  • related external power source plugged in, power quality acceptable
  • extinguishes when ON light illuminates
  • main deck cargo handling bus powered when external power 2 AVAIL light illuminated
59
Q

What does the APU GEN Power Available (AVAIL) light indicate when illuminated (white)?

A
  • APU generator power quality acceptable
  • main deck cargo handling bus powered when APU generator 2
60
Q

What does the Generator Control (GEN CONT) Switch do in the OFF position?

A
  • opens field and generator control breakers
  • resets fault control logic
  • isolates geneartor from its related AC bus

Kalitta 747-400 Systems (18 decks)

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