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McDonnell Douglas DC-9/MD-80 (none) > Electrical > Flashcards

Electrical Flashcards

1
Q

What power sources can cross tie on the ground?

A

The engine generators.

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2
Q

What is the electrical source priority?

A

On side engine generator
APU generator
External power unit
Off side generator cross tie

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3
Q

What does the reset position of the generator control switch do?

A

Closes the generator control relay.

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4
Q

When only the battery switch is on what buses are powered?

A

DC Transfer Bus
Battery Direct Bus
Battery Bus

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5
Q

What are the two purposes of the ground service bus?

A

To provide power to those circuits necessary for ground service, and to provide an alternate means of battery charging. (B2 8-120)

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6
Q

Is there a way to monitor external power?

A

No AC load meter exists for external power.

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7
Q

At what RPM should you disconnect a CSD?

A

A higher speed to allow for a smoother disconnect.

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8
Q

Can a CSD be reconnected?

A

Yes, but only on the ground by a mechanic.

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9
Q

What is the electrical power source for the pneumatic pressure gauge?

A

Emergency AC bus

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10
Q

What is the electrical power source for the augmentation valve?

A

Respective DC bus

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11
Q

What is the power source for the start valve solenoid?

A

The DC Transfer bus

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12
Q

How do you verify an AC EMER BUS OFF light?

A

By looking for a “GYRO” flag in the captains ADI

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13
Q

What normally powers the DC Transfer bus?

A

The Left AC Bus through the Left DC Bus

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14
Q

How would you identify a differential fault in the “feeder” zone?

A

Move Generator switch to reset and off and observe no volts and frequencies.

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15
Q

What is needed for battery charging to occur?

A

Ground Service AC bus powered, battery switch on, emergency switch off.

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16
Q

How would you verify the DC TRANSFER BUS OFF light?

A

By doing a fire warning test.

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17
Q

Is the DC cross tie automatic?

A

No

18
Q

How many circuit breakers must be pulled to disconnect a Transformer Rectifiers from its power source?

A

3, one for each phase of the AC input.

19
Q

What is the power source for the #2 Transformer Rectifier on the right side?

A

The Ground Service Bus

20
Q

What happens if you turn off the Battery Bus if you have the Emergency Power switch on?

A

You will lose the DC Transfer Bus and the Battery Bus, along with battery charging.

21
Q

List some items (3) powered by the Battery Direct Bus

A

Emergency Inverter
DC Emergency Bus
Fuel Fill and Transfer Valves

22
Q

How many batteries are on board?

A

Two 14 volt NICAD batteries.

23
Q

What are the Major Faults in the Electrical System? (2)

A

Generator Bus Differential Feeder Fault
Generator Bus Short

(B2 8-127)

24
Q

What are the Minor Faults in the Electrical System? (5)

A 
Overvoltage
Undervoltage
Underfrequency
Overspeed
Incorrect phase sequence

(B2 8-127)

25
Q

What will cause the AC Crosstie to lock open?

A

A major fault

26
Q

After a Major Fault how would you know that it is a Generator Differential Feeder Fault? Can the associated bus be powered and if so by what?

A

If zero voltage and zero frequency are observed on the associated voltmeter for that bus. Yes it can be powered by the APU.

27
Q

After a Major Fault how would you know that a Generator Bus Short has occurred? Can the associated bus be powered and if so by what?

A

If good voltage is observed on the voltmeter for the associated bus. No it must not be powered by the APU as a short exists on the bus.

28
Q

During a Minor Fault will the AC Crosstie automatically close?

A

Yes

29
Q

What does the Ground Service AC Bus receive power from?

A

Right Generator Bus
APU
External Power

30
Q

Generally what kind of items do the Generator Buses supply power to? Where do these buses get their power from?

A

High current draw items. They receive their power directly from the generator.

31
Q

Generally what kind of items do the L/R AC Buses supply power to? Where do these buses get their power?

A

Low current draw items and the DC power distribution system. They receive power directly from the onside Generator Bus.

32
Q

What is the purpose of a Generator Relay?

A

To provide a means of disconnecting the generator’s output from the Generator Bus. (B2 8-124)

33
Q

What is the purpose of the Generator Control Relay?

A

Often referred to as the Field Relay this provides a means of controlling the generator field, or the way for the generator to produce current.

34
Q

If the Generator Control Relay opens what other relay opens?

A

The Generator Relay will also open. The reason both switches exist is because you need a way to disconnect the power to the system (Generator Relay) and you need a way to stop the generator from producing power (Generator Control Relay).

35
Q

What normally powers the Emergency DC Bus?

A

The Left DC Bus which is in turn powered by the Left AC Bus.

36
Q

What gauges will work on Emergency Power?

A 
Airspeed Cpt
ADI without the FD Cpt
Altimeter Cpt
VSI
EGT
N1
N2
Oil pressure low lights
37
Q

Can one TR power the entire airplane?

A

Yes

38
Q

What indicates that the Emergency DC Bus is unpowered?

A

Captains pitot heat is inoperative.

39
Q

What do the blue APU and External Power Available lights mean?

A

Power is available, meets frequency/voltage requirements, and the phase sequence is correct.

40
Q

All temperature readings are powered by what?

A

AC power

41
Q

All direct reading items are powered by what?

A

DC power

42
Q

All pressure reading items are powered by what?

A

AC power

McDonnell Douglas DC-9/MD-80 (none) (15 decks)

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