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Republic Dash 8 Q400 > Electric > Flashcards

Electric Flashcards

1
Q

The DC electrical system is supplied by:

A

3 NiCad batteries (24v DC)
2 Engine driven DC Starter-Generators (28.5v DC)
2 Transformer Rectifier Units (28v DC)
1 Auxiliary Power Unit (28v DC)

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2
Q

Name the 7 DC busses.

A

Battery
Left and Right Essential
Left and Right Main
Left and Right Secondary

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3
Q

The AC electrical system is supplied by:

A

2 engine driven AC generators that provide 115 volt, three-phase, variable AC power

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4
Q

Automatic reconfiguring of the electrical system is controlled by the…

A

Electrical Power Control Unit (EPCU).

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5
Q

Where are the batteries located?

A

main and aux - lower left section of nose compartment

standby - upper left section of nose compartment

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6
Q

Volts and amp hours of batteries

A

24 volt, 40 amp hour

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7
Q

Batteries that assist engine start

A

main and aux

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8
Q

How long will batteries supply emergency power?

A

approximately 45 minutes

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9
Q

Which battery is connected to the “hot” battery bus

A

standby battery

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10
Q

BATTERY MASTER switch

A

closes 3 contactors directly connecting all three batteries to the essential DC buses

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11
Q

How is the EPCU powered?

A

indirectly from essential busses, primarily from standby battery

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12
Q

MAIN/AUX/STBY BATT switch

A

directly connects respective battery to its main bus

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13
Q

What busses is the main battery connected to?

A

right main DC bus (2 way flow), right essential bus

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14
Q

What busses is the aux battery connected to?

A

left main DC bus (2 way flow), left essential bus

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15
Q

What busses is the standby battery connected to?

A

left main DC bus (1 way flow for charging), right essential bus

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16
Q

Battery temperature range

A

amber - 50C to 65C

red - greater than 65C

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17
Q

What bus is external DC power is received by?

A

left main DC bus

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18
Q

When will the EPCU automatically disconnect from the external power source?

A

external DC voltage exceeds 31 volts or drops below 22 volts

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19
Q

What are the DC starter-generators driven by?

A

engine accessory gearbox

20
Q

How are the DC starter-generators cooled?

A

air cooled

21
Q

How are the DC starter-generators monitored and controlled?

A

respective Generator Control Unit (GCU)

22
Q

At what point does the GCU convert the DC starter-generator from starter mode to generator mode?

A

Nh of 50% during start

23
Q

What are the volts and amps of the DC starter-generators.

A

28.5 volts, 400 amps

24
Q

How are the TRUs cooled?

A

air cooled

25
Q

What do the TRUs do?

A

convert 115 volt 300 amp variable frequency AC power into 28 volt DC power

26
Q

How can you manually control the TRUs?

A

respective circuit breaker located on the 115 volt variable AC circuit breaker panel

27
Q

What is the APU start-generator rated at?

A

28 volts, 400 amps

28
Q

When does automatic load shedding occur?

A

loss of more than two DC power sources

29
Q

What is EPCU emergency mode?

A

loss of both DC generators and one TRU

30
Q

What happens during EPCU emergency mode?

A

EPCU automatically disconnects the batteries from the main busses leaving them only able to supply power to essential busses (approximately 45 minutes)

31
Q

Can the engines be restarted in the air in EPCU emergency mode?

A

yes, EPCU will allow batteries to be momentarily reconnected to main busses

32
Q

What happens when the EPCU detects a bus fault?

A

automatically takes offline all the DC components associated with the faulty bus via isolation

33
Q

How are the AC generators cooled?

A

oil cooled

34
Q

How are the AC generators driven?

A

propeller reduction gearbox

35
Q

How are the AC generators rated?

A

115 volt, three phase, variable frequency AC power

36
Q

What components are powered by AC power?

A 
deicing/anti-icing heaters
standby hydraulic pump (#1 system)
TRUs
#1 and #2 aux fuel pumps
galley loads
37
Q

Where are circuit breaker panels located?

A 
four flight compartment panels
DC contactor box in nose compartment
AC contactor box in left and right wheel well
two wardrobe circuit panels
galleys
38
Q

1 or #2 DC GEN HOT caution light

A

DC generator temperature is more than 166C

39
Q

1 or #2 AC GEN HOT caution light

A

AC generator temperature is more than 166C

40
Q

1 or #2 DC GEN caution light

A

DC generator not connected to its bus due to a source fault condition, the DC toggle switch is set to OFF, or the external DC power is energizing the main feeder busses

41
Q

1 or #2 AC GEN caution light

A

AC generator not connected to its bus due to a source fault condition, the AC toggle switch is set to OFF, or the external AC power is energizing the main feeder busses

42
Q

STBY/MAIN/AUX BATTERY caution light

A

battery is not connected to its main feeder bus for charging

43
Q

L or R TRU HOT caution light

A

TRU temperature is more than 71C

44
Q

L or R TRU caution light

A

AC secondary feeder bus not energized by its related TRU because of a source fault condition or the AC generator toggle switches are set to OFF

45
Q

DC BUS caution light

A

EPCU has reconfigured the main 28 VDC generation system because of a source or fault condition

46
Q

L or R AC BUS caution light

A

AC generator not connected to its bus due to a right bus fault condition or the AC generator contractor is open while the generator is operating and the AC generator toggle switch is set to ON

47
Q

STBY/AUX/MAIN BAT HOT warning light

A

battery temperature is greater than 71C

Republic Dash 8 Q400 (16 decks)

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