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Oral Prep 767 > Electrics > Flashcards

Electrics Flashcards

1
Q

How is fuelling powered?

A

Ground handling bus

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2
Q

What’s the only way to use standby power?

A

HDG fail

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3
Q

How many AC sources of power does the aircraft have?

A

5
2IDG’s
APU
HDG
External power
Standby power

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4
Q

How many sources of power on the ground do we need to power the aircraft?

A

1

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5
Q

How many AC power sources do we need to power the aircraft?

A

2

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6
Q

What is the load shed order?

A

Galley Buses
Utility buses
Whatever Boeing deems necessary
Restored in reciprocal order

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7
Q

If we lost the left generator. 1 AC power source remaining. Why does the pressure light on the C2 come on?

A

Boeing logic load sheds it

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8
Q

What items are on the Hot Battery Bus?

A

Fire Protection
Captains clock
RAT – deploys below idle RPM with dual engine failure
Set Parking Brake

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9
Q

When will the RAT deploy automatically?

A

In flight, below idle N2 RPM, Battery Bus ON
*Manual deployment on Hot Battery Bus

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10
Q

How is the aircraft fuelled without power to the ground handling bus?

A

Fuel Access Panel

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11
Q

Powering up the aircraft what lights come on?

A

Battery on light
Discharge light
Standby power OFF light
• 2 buses powered

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12
Q

Moving Standby power switch to AUTO powers how many buses are powered?

A

4
Standby AC
Standby DC
Hot Battery
Battery

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13
Q

What is the purpose of the Flight Instrument Xfer Buses?

A

Receives cross power for flight instruments with the failure of the bus that powers them normally.
Only works in Non Normal

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14
Q

What is the purpose of the DC BTB?

A

To provide DC power with the failure of the Transformer Rectifier.

The BTB closes when Transformer rectifier fails.

Works in non normal

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15
Q

What is the purpose of the BTB

A

Prevents Paralleling
Isolates from a fault
Powers cross side

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16
Q

What does the BTB isolation light mean?

A

BTB is open and can not be reset in flight.

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17
Q

If the Bus tie switches are not in AUTO, which systems are not available?

A

2 AC BTB
1 DC BTB
2 Flight instrument Xfer bus

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18
Q

Why are all electrical switches in the auto position?

A

Allows Boeing logic to control the system. Arms the GCB to automatically close

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19
Q

What does pushing the Generator Drive switch do?

A

Disconnects the IDG from the engine, it can only be reset on the ground.

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20
Q

What are the only reasons for Generator Drive Light?

A

High Oil Temp
Low Oil Pressure

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21
Q

What happens/what is seen with the Generator Control Switch off?

A

Flow bar is NOT in view.
Opens the GCB. Resets fault trip circuitry

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22
Q

What functions can the Generator Control switch perform?

A

On
Off
Reset

23
Q

How can you open a GCB?

A

Select Generator Control Switch Off
External Power connection
Pull the Fire Handle

24
Q

With the APU generator control switch ON, what happens?

A

Flow Bar in view
Arms the GCB to automatically close when APU power available

25
Q

With the APU generator control switch OFF, what do you see/what happens?

A

Flow bar not in view
Opens GCB
Resets fault trip circuitry

26
Q

Where do we connect External Power?

A

Just behind the Nose gear on the right side. 1 connection.

27
Q

On external power, can you power flight deck lights?

A

Ground service switch

28
Q

When external power is connected what is the new bus that is powered?

A

Ground Handling Bus

29
Q

The ON light on the External power switch means what?

A

External power is connected to a main bus

30
Q

What is the AC Bus priority?

A

Respective Engine Driven Generator
APU Generator
Cross Side Engine Driven Generator

31
Q

What are the load shed events?

A

Overload
Engine Start
Loss of Generator

32
Q

Why does an overload load shed event occur?

A

During Pressurisation of HYD – C2 Pump and both galley busses are shed
As HYD reconfigured for flight the electrical primary and demand pumps draw a high load

33
Q

What is lost when an Engine load shed event occurs?

A

Left Electric Demand Pump
Both utility busses

34
Q

What is lost when a Single power source load shed event occurs?

A

Both Galley buses
Both utility buses
Whatever else Boeing chooses

35
Q

Starting right engine what should you see?

A

Engine Valve Light
Spar Valve light
They let you know you have control of the fuel system in the event of needing to shut it down

36
Q

Shedding occurs when?

A

Thrust lever advanced with engine shutdown. Must reset
Overload
Start engine
Single power source

37
Q

**Why is load shedding less for starting second engine?

A

Engine providing power to buses. APU diverts air to provide 21PSI for start
?????

38
Q

After engine start where does the Ground Handling Bus get its power from?

A

APU

39
Q

After take off how long is the Ground Handling Bus powered?

A

Powered for take off until the main gear logic confirms airborne

40
Q

External power switch AVAIL Light on. Where are the BTB?

A

Open

41
Q

What happens to the BTB’s on R engine start?

A

On engine start R BTB opens when R GCB closes. L BTB remains closed to receive power from the APU. Flight instrument transfer BTB’s and DC BTB are open – waiting for fault

42
Q

With a left bus fault, what lights are ON?

A

L Bus Tie ISLN
L BTB BUS OFF
L GEN CONT OFF
Utility Bus L + R OFF

43
Q

With a left bus fault, would you start the APU?

A

Yes. As a back up for the R Bus in case it fails

44
Q

What items continue to be powered with dual AC power failure?

A

HDG – located on the C HYD system, powered automatically
4 Standby Buses
CA Flight Inst Bus
2 ETOPS Buses

45
Q

On the HDG why is the battery chargers light on?

A

Battery chargers are more powerful than the power being supplied by the HDG. When the power reduces to the HDG being stronger, the light will go out.

46
Q

On the HDG what components on the panel are lost?

A

Upper lower EICAS
Auto Brakes

47
Q

With the loss of all AC power how are the IRU’s powered?

A

Hot Battery Bus. After 5 minutes, the right IRU shuts down

48
Q

With the shut down of the R IRU, what else do we lose?

A

Captains Heading Flag on the RDMI

49
Q

In the event of a using standby power, what happens to the fuel?

A

Suction fuel created by pressure differential. No AC fuel pumps

50
Q

What items are lost with a dual AC power failure?

A

Lose the FO’s side
EICAS CRT’s
Auto brakes
Cpt’s Heading RDMI

51
Q

What no longer remains to be powered with the loss of the L Main AC Bus?

A

Utility Buses
Galley Buses
Left AC Transfer Bus
Centre AC Bus

52
Q

What systems are on the Hot Battery Bus

A

Fire extinguisher bottle - Fire Protection

Captain clock
APU fuel valve
Backup power for IRU’s

53
Q

If you lose the R Main AC Bus, what happens to the batteries?

A

No longer charged due to loss of the Ground Service Bus

54
Q

With the APU generator control switch OFF light displayed, what happens?

A

Generator Control Breaker Open

Oral Prep 767 (37 decks)

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