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NATOPS > Electrical > Flashcards

Electrical Flashcards

1
Q

What are the 3 primary sources of electrical power?

A

AC, DC, external power

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2
Q

Which MCBs are on the pilot side circuit breaker panel? Copilots?

A

Essential DC bus MCBs Main and avionics DC bus MCBs

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3
Q

How many ECBUs are there? How many AC and DC ECBs are in each unit?

A

14 24 DC / 15 AC

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4
Q

What is the AC power system comprised of? What is it powered by?

A

6 AC buses and 2 AC inverters powered by an external power supply, engine generators, and/or APU generator

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5
Q

What powers the main avionics AC inverter and what does the inverter power in return?

A

Avionics DC bus Main avionics AC bus

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6
Q

What powers the essential avionics AC inverter and what does the inverter power in return?

A

Isolated DC bus essential avionics AC bus

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7
Q

What does the external power supply?

A

all 12 AC and DC buses

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8
Q

What are the engine generators rated at? How are they cooled?

A

115V 3 phase oil-cooled

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9
Q

What is the APU generator rated at? How is it cooled?

A

115V 3 phase air-cooled

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10
Q

What is the DC power system comprised of?

A

6 DC buses 4 transformer rectifiers bus-tie relay 2 batteries

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11
Q

What do the transformer rectifiers do?

A

convert AC power to DC power

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12
Q

What does the bus-tie relay do?

A

separates the isolated DC and avionics DC buses from each other when the APU is not online

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13
Q

What are the two batteries? What do they supply power to?

A

Utility battery - utility battery bus and isolated dc bus Avionics battery - avionics battery bus and avionics dc bus

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14
Q

What are the batteries rated at?

A

lead-acid 24 Vdc, 35 amp/hour

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15
Q

Are the batteries interchangeable?

A

Yes, they are identical and interchangable

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16
Q

What are the 6 AC buses?

A

LH, RH, essential, main, essential avionics, main avionics

17
Q

Which buses are powered by any of the engine-driven generators?

A

Both the essential ac bus and the main ac bus

18
Q

What buses are powered by the APU if the APU is the only source of power?

A

essential ac and main ac

19
Q

What bus is ALWAYS powered by the APU?

A

essential ac

20
Q

If one generator is failed, which generator picks up the load? If both are failed on the same wing?

A

generator on the same wing symmetrical generator on opposite wing

21
Q

What are the inverters rated at?

A

115 Vac

22
Q

The inverters supply how much power?

A

26 Vac

23
Q

Can the APU and external power supply power at the same time?

A

No. Interlocks allow either or to supply power

24
Q

During ground operations, do not attempt to start the APU if the battery voltage is less than what? In-flight? What happens if you do, both on the ground and in-flight?

A

22 Vdc, may cause the battery to overheat 23 Vdc, a voltage transient may cause an unrecoverable loss of essential equipment including MC, displays, and other mission critical battery powered systems.

25
Q

If a differential fault has occurred, the generator cannot be reset until when?

A

DC power has been removed from the GCU generator has stopped rotating generator control circuit breaker is pulled and reset

26
Q

What does the Generator Control Unit do?

A

monitors the generator frequency and voltage and regulates the power output to the bus

27
Q

A GCU can fail without generating an ACAWS. When should you suspect a latent GCU failure?

A

when 115 Vac is indicated on all phases with the % LOAD indicating zero when the generator should be providing power to the electrical system

28
Q

What TRs does the essential ac bus power?

A

1 and 2

29
Q

What TRs does the main ac bus power?

A

3 and 4

30
Q

Which TRs power the essential DC bus?

A

1 and 3

31
Q

Which TRs power the main DC bus?

A

2 and 4

32
Q

What are the 6 DC buses?

A

essential, main, isolated, avionics, utility battery bus, avionics battery bus

33
Q

The TRs convert AC power into how much DC power?

A

28 Vdc

34
Q

When should you pull MCBs?

A

only during emergencies or maintenance

NATOPS (14 decks)

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