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748 > Electrical Power > Flashcards

Electrical Power Flashcards

1
Q

If the IDG has a fault with Low oil pressure, high oil temp, or a frequency fault, what would the flight deck effect be?

A

Electrical system sources and distribution system detects and isolates faults automatically. When a power source is not available the system reconfigures automatically to ensure electrical power loads are within the capacity of the operating power source.

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2
Q

Can the IDG be reconnected in flight after disconnection?

A

No

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3
Q

What electrical system parameters are displayed on the status page?

A
  • Main battery voltage and current.
  • APU battery voltage and current.
  • whether they are being charged or discharged.
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4
Q

What system ensures power availability to critical equipment during electrical overload?

A

Load Management System.

Electrical Load Control Unit (ELCU)

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5
Q

What happens when load shedding occurs?

A

Load management system sheds AC loads by priority until loads are within the capacity of the aircraft or ground power generators.

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6
Q

What are the indications shown during load shedding?

A 
FUEL PUMP 3 FWD
FUEL OVRD 2 FWD
FUEL OVRD 3 FWD
FUEL OVRD CTR L
FUEL PUMP 2 FWD
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7
Q

What occurs when two different power sources are connected to the same sync bus? (On ground)

A

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

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8
Q

What power condition during start allows the whole synchronous bus to be powered by the first IDG coming online?

A

Split system breaker closes and power is provided to the synchronous bus by the IDG.

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9
Q

If the aircraft is using dual ground power sources, which busses will be powered by the first IDG coming online?

A

The IDG powers it’s side of the synchronous bus.

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10
Q

During engine start, power transfer occurs with or without a break?

A

Without:

-Output from IDG and another power source momentarily synchronised before one source is disconnected.

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11
Q

What powers AC Bus 2 when Number 2 IDG fails?

A

AC synchronous bus:

-Bus tie breaker closes to provide power from the synchronous bus.

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12
Q

What is the effect of excessive oil temperature on the IDG if not manually disconnected?

A

Disconnects IDG automatically and is not done manually by the crew. EICAS advisory message GEN OFF is displayed and loss of generator power output causes GCB to open.

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13
Q

Can an APU generator be used in flight?

A

No- Ground use only.

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14
Q

Which component allows connection between the AC buses and the sync bus?

A

Bus tie breaker

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15
Q

How is a tripped bus tie breaker reset?

A

Pushing BTB off, then AUTO, resets logic circuitry and allows BTB to close if fault is corrected?

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16
Q

How is the Ground Service Bus usually powered?

A

On ground and inflight whenever AC bus 1 is powered.
-When AC bus 1 is not powered, GSB can be connected to the same source at GHB by pushing Ground Service Switch on Main Deck Panel door L1.

17
Q

List the normal and alternate power sources for the captains transfer bus and the first officers transfer bus.

A

Captain: AC Bus 3 (ALTN AC Bus 1)

First officer: AC Bus 2 (ALTN AC Bus 1)

18
Q

How can the external power be connected to the ground service bus?

A

When AC Bus 1 is not powered, GSB can be connected to the same source at GHB (PWR by EXT PWR 1) by pushing Ground Service switch on main deck panel door L1.

19
Q

Which are the two power sources for the ground handling bus and what are their priorities?

A

EXT PWR 1 and APU GEN 1 (EXT PWR 1 has priority)

20
Q

List the users of ground handling bus.

A
  • Lower cargo handling equipment and Compartment lights.
  • Fuelling System.
  • Aux hydraulic pumps 1 and 4.
21
Q

List the users of utility busses.

A
  • Forward main fuel pump 2 and 3.
  • Forward OVRD/jettison pump 2 and 3.
  • Centre OVRD/Jettison pump.
  • Galley equipment.
22
Q

How is ELEC UTIL BUS fault reset?

A

Cycling the Utility Power switch OFF, then ON, restores power to the effected bus of the fault is corrected.

23
Q

With EXT 2 or APU 2 AVAIL lights illuminated, which bus can be powered?

A

Main Deck Cargo Handling Bus.

24
Q

During a normal Autoland electrical power isolation, which AC bus powers the synchronous bus?

A

AC bus 4

25
Q

Can you view the Electrical Synoptic Oage during Autoland below 1500 feet RA?

A

No

26
Q

What is the normal and alternate power sources for the main standby bus and the time limitation?

A

Normally powered by AC Bus 3.

Main battery can supply main standby bus through main hot battery bus for 30 minutes minimum.

27
Q

List the users of the main AC standby bus

A

-Left EIU, CDU, ILS, VOR.
-Various flight control components.
-Standby ignition for all engines.
Primary EICAS display, standby instrument lights.
-Left ADC, Transponder, EFIS control panel.

28
Q

What is the normal and alternate power source for the APU standby bus and the time limitation?

A

Normally powered by Captains transfer bus (AC bus 1 and 3).

APU standby inverter from APU battery through APU hot battery bus (30 minutes minimum)

29
Q

List the users of the APU standby bus.

A

Left FMC
Left ND
Left PFD

30
Q

Describe the selections available for the standby power selector.

A

OFF- standby power not available.
AUTO- main bus and APU standby bus powered from available sources.
BATT- ground maintenance use only.

31
Q

How long can the main and APU battery supply power?

A

Minimum 30 minutes.

32
Q

Which switch selection is required to isolate both BTB and DCIR?

A

Pushing Bus Tie Switch to OFF

33
Q

HOT BAT bus is normally powered from what source?

A

AC bus 1/GSB

748 (18 decks)

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