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KV Prep > Electrical > Flashcards

Electrical Flashcards

1
Q

How can external power be used by the ground crew when the cockpit door is locked?

A

Press the AC PUSH switchlight on the external service panel

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2
Q

What might the DC Service switch be used for?

A

External aircraft lights while repositioning the aircraft without the battery master on

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3
Q

In the aircraft with no power switched on, which buses are powered?

A

APU Direct Bus
Main battery Direct Bus
EMER bus

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4
Q

How many volts must be present prior to APU start?

A

22 volts minimum

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5
Q

What is the time limit on battery power without the APU or external power and why?

A

5 minutes to prevent over heating the CRTs without the cooling fans

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6
Q

How many AC buses are there?

A

4

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7
Q

How many DC buses are there?

A

9

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8
Q

What normally powers AC bus 1 & 2 and what is the switching priority in an abnormal situation?

A

GAGE

G onside generator
A APU
G offside generator
E external power

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9
Q

How many TRU’s are there and what is their maximum power rating?

A

4 rated at 120 amps , 28 VDC

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10
Q

How many DC bus ties are there and what are their names?

A

5

The main tie
Cross tie
Utility tie
Essential Tie
Essential TRU tie
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11
Q

If the cross tie closes, what else will close

A

The main tie and essential tie will always close if the cross tie closes

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12
Q

When is the DC utility bus shed?

A

When the main tie or cross tie closes

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13
Q

What items are on the utility bus?

A

The passenger service units (Primarily reading lights)

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14
Q

How are the DC bus ties controlled?

A

Automatically

DC bus tie control is automatically accomplished through the 2 DC power centers (DCPCs)

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15
Q

When will the ESS TRU 2 TIE close (causing it to display on the DC synoptic page)

A

with the loss of AC Bus 2 and ESS True 1

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16
Q

What does the DC ESS bus primary provide power for?

A

The captains flight instruments

17
Q

When will the ADG automatically deploy?

A

During a complete AC Power failure

18
Q

What buses are powered by the ADG?

A

The ADG bus, AC essential bus, and the DC battery bus

19
Q

What items are powered by the ADG?

A

HEFAS

Hydraulic pump 3B
Essential AC bus
Flaps and slats @ half speed
ADG bus
Stab trim channel 2
20
Q

How much power does the ADG produce?

A

115 volts, 15 kVA

21
Q

What is the minimum airspeed for ADG operation?

A

135 KIAS

22
Q

why must the ADG handle be pulled after an auto deployment?

A

Because you will loose DC Essential bus power if you dont

after landing with weight on wheels internal logic will cause the loss of power to the DC ESS bus if the handle is not pulled

As the aircraft slows below 135 KIAS on approach, the ADG will no longer be able to generate sufficient power for operation. The DC ESS bus will continue to be powered through the batteries, but after landing with weight on wheels internal logic will cause the loss of power to the DC ESS bus if the handle is not pulled

23
Q

How is normal power restored after an ADG deployment if a generator returns?

A

By stowing the ADG handle and pressing the PWR TXFR OVERRIDE button

24
Q

Can hydraulic pump 3B be deselected after an ADG deployment?

A

No. It is hardwired to the ADG bus for continuous operation

25
Q

What items are powered by the DC emergency bus?

A

Engine fire extinguishers
APU fire extinguisher
Fuel SOV
Hydraulic Sov

26
Q

What powers the DC emergency bus?

A

The APU batter direct bus and the DC battery bus

27
Q

When is the DC emergency bus displayed on the DC synoptic page?

A

When power is lost from 1 or both of its power sources.

28
Q

When operating only off the batteries in an emergency power situation, how many minutes of battery life does each APU start attempt cost?

A

6 minutes

29
Q

Where is the main battery located?

A

In the forward nose compartment

30
Q

Where is the APU battery located?

A

In the aft equipment bay

KV Prep (14 decks)

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