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757/767 MQB > Electrical > Flashcards

Electrical Flashcards

1
Q

During an autoland, if a loss of the left generator below 200 feet (with no APU
operating) occurs, the left autopilot and left main AC bus become unpowered. Will
thee to have flight instruments displayed?

A

Yes. Flight instruments remain powered through the

flight instrument transfer busses.

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2
Q

(757) During engine start when the APU is used for both electrical and pneumatic
power, what utility bus(ses) load shed(s)?

A

When the first Engine Start selector is moved to GND,
both utility busses trip. When the second Engine Start
selector is moved to GND, only the respective utility bus
trips.

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3
Q

(767) The amount of DC power produced by the HDG is less than the DC power
produced by a fully charged battery. Which of the following indications might you
get until the battery power decreases to the power level produced by the HDG?

A

The Battery DISCH light.

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4
Q

(767) Which hydraulic pump is inhibited during engine start?

A

Le􀅌 electric demand pump is inhibited on the ground

during engine start of either engine.

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5
Q

(757) Which hydraulic pump load sheds automatically to reduce electrical loads
when operating on one generator with both Center Electric Pump switches ON?

A

The C2 pump load sheds

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6
Q

What does the Engine Generator OFF light and EICAS message indicate?

A

Generator control breaker is open

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7
Q

What three conditions shed the utility busses on a B757?

A

Engine start, generator loss and overload

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8
Q

What are the power sources for the ground handling bus?

A

External power or APU

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9
Q

(757) What is the normal source of power to the Captain’s flight instruments?

A

Left main AC bus

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10
Q

Cycling the Generator Control switch (OFF then ON) has what effect?

A

OFF ‐ resets trip circuitry and ON arms generator to close

automatically when generator power is available

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11
Q

What occurs if the Generator Drive Disconnect switch is pushed?

A

Disconnects generator and drive from engine and cannot

be reset by the flight crew

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12
Q

What does the BUS OFF light and associated EICAS message indicate?

A

Indicated AC bus is unpowered

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13
Q

What are the priorities for powering the left and right main AC busses?

A

Respective IDG, APU generator and opposite IDG

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14
Q

When does the generator load shed protection arm regarding a generator loss?

A

Aircraft in flight or both thrust levers moved into the

takeoff range

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15
Q

What occurs following a failure of one engine‐driven generator during a multiautopilot
approach, APU operating?

A

AC bus is powered by the APU when the associated bus

tie breaker closes

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16
Q

What does the External Power AVAIL light indicate?

A

External power is plugged in and power is acceptable

17
Q

What is the normal power source for the ground service bus?

A

Right main AC

18
Q

What does the Battery DISCH light and MAIN BAT DISCH EICAS message indicate?

A

Battery is discharging

19
Q

What does the Standby Power Bus OFF light and STANDBY BUS OFF EICAS message
indicate?

A

Standby AC and/or DC bus not powered and/or battery

bus and/or Standby Power selector in OFF

20
Q

Which of the following will cause the Generator DRIVE light to illuminate?

A

Generator drive oil temperature is high

21
Q

What can power a utility bus?

A

Respective main AC bus only

22
Q 
What busses power the autopilots during a coupled ILS approach (autoland) after
selecting APP (approach switch)?
A

Left main AC powers left autopilot, right main AC powers
right autopilot and standby/battery powers center
autopilot

23
Q

How are both standby busses powered when the Standby Power selector is
positioned to BAT?

A

Standby busses are powered from the hot battery bus

24
Q

What does the AC Bus ISLN light indicate?

A

Indicates fault or Bus Tie switch is OFF

25
Q

What does the Utility Bus OFF light and associated EICAS message indicate?

A

Utility bus unpowered

26
Q

What is the purpose of the bus tie system?

A

Allows the right and left main AC busses to be isolated or

connected

27
Q

What does the Generator DRIVE light and L or R GEN DRIVE EICAS message indicate?

A

Generator Drive Low oil pressure or Generator Drive

high oil temperature

28
Q

What components are powered from the ground handling bus?

A

Lower cargo lights, refueling features and cargo handling

29
Q

When is the ground handling bus powered?

A

Only on the ground

30
Q

What does the APU Generator OFF light and APU GEN OFF EICAS message indicate?

A

APU is running and the generator breaker is open
because of a fault or the APU Generator switch is
selected OFF

31
Q

What items are powered from the ground service bus?

A

Main battery charger, APU battery charger, AFT NO.1 E/E
cooling fan, Left forward fuel pump and Main deck cargo
lighting

32
Q

(757) What busses are powered if both main AC busses fail?

A

Hot battery bus, Battery bus, Standby DC bus, Standby

AC bus

33
Q

(757) With the APU supplying both electrical and pneumatics, what occurs as the
first engine is started as it relates to utility bus load shed?

A

Both utility busses shed

34
Q

(757) With the APU supplying both electrical and pneumatics, what occurs as the
second engine is started as it relates to utility bus load shed?

A

Only the respective utility bus sheds

35
Q

(767) If both left and right AC busses are unpowered, what is the backup power
source?

A

Hydraulic Driven Generator (HDG)

36
Q

(767) Which busses are powered from the Hydraulic Driven Generator (HDG)?

A

Standby AC/DC busses, hot battery bus, battery bus DC,
left and right transfer busses and Captain’s flight
instrument transfer bus

37
Q

(767) What is the power source for the Hydraulic Driven Generator (HDG)?

A

The HDG is powered by the center hydraulic system

38
Q

(767) APU supplying both electrical and pneumatics, what occurs as the second
engine is started as it relates to utility bus load shed?

A

There is no load shedding of utility busses during engine

start

39
Q

(767) The loss of which bus or busses will cause the Hydraulic Driven Generator
(HDG) to operate?

A

The left and right main AC busses

757/767 MQB (21 decks)

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