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2020 CQ > Electrical > Flashcards

Electrical Flashcards

1
Q

What does the IDG amber LED indicate?

A

Which IDG must be disconnected.

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2
Q

What doe turning the IDG switch to OFF do?

A

Opens the IDG contractor isolating the IDG from the AC BUS

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3
Q

What does turning the IDG switch to DISC d?

A

mechanically disconnects the IDG (cannot be reconnected in flight)

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4
Q

How are the DC ESS busses powered in the event of a complete AC power loss and prior to RAT deployment?

A

Aircraft batteries via the Hot BATT busses 1&2

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5
Q

What is the minimum speed if the RAT is deployed?

A

130 KIAS

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6
Q

Which busses will the RAT power?

A

Essential busses

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7
Q

Can the RAT be manually deployed?

A

yes

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8
Q

Can the RAT be stowed in flight?

A

no

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9
Q

Can the RAT handle the same electrical load as the IDGS?

A

no

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10
Q

When does the RAT automatically deploy?

A

when AC busses are not powered

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11
Q

How long does it take for the RAT to deploy?

A

8 seconds

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12
Q

Which HYD pump operates when the RAT is deployed?

A

HYD pump 3A

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13
Q

What powers the APU start bus?

A

Batt2

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14
Q

What is the source priority for powering the airplane?

A

Rspective IDG (onside)
APU. (inside)
GPU (outside)
Opposite IDG (cross side)

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15
Q

What do the TRUs do?

A

converts AC power to DC

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16
Q

What do you expect to happen if the parking brake is released with the GPU connected?

A

EICAS caution message and a “GPU connected” aural warning.

17
Q

Can the aircraft be powered using the DC GPU?

A

no

18
Q

How are the batteries charged?

A

through the TRUs

19
Q

What is the purpose of the AUTO function on Batt2?

A

system logic allows it to control the APU start bus or the DC ESS bus.

20
Q

How long will the Aircraft batteries las on emergency power if the RAT Does not deploy?

A

10 minutes

2020 CQ (12 decks)

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