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Dash 8 Q400 2 > Electrical System > Flashcards

Electrical System Flashcards

1
Q

Batteries (#, volts, amps)

A

3, 24vDC, 40amps

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2
Q

Engine Driven DC Starter-Generators (#, volts, amps)

A

2, 28vDC, 400amps

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3
Q 
APU Generator 
#,volts, amps
A

1, 28v DC, 400amps

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4
Q

TRUs #, voltage, amps

A

2, 28v DC, 300amps

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5
Q

DC GPU

A

1, 28v DC

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6
Q

Batteries (names)

A

3, Main, Auxiliary & Standby

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7
Q

Battery Location

A
  • Main & Auxiliary batteries are located on the left side nose of the aircraft (lower panel)
  • Main Battery is also located forward of the Auxiliary battery in the lower panel
  • Standby battery is located on the left side nose of the aircraft (upper panel)
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8
Q

Which battery(s) are able to assist with engine starts (when performing external power starts or battery starts)

A

Main & Auxiliary batteries

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9
Q

Which battery(s) supply DC power to the “HOT battery bus” for the operation of various emergency system operations

A

Standby Battery

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10
Q

Which battery(s) supply emergency backup power to the airplane’s “Essential DC buses” and for how long

A

All 3, (approx.45 minutes)

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11
Q

Which battery(s) for a second engine start MUST show a _ or less on the MFD- Electrical Systems Page

A

All 3 batteries for a second engine start MUST show a .4 or less on the MFD- Electrical Systems Page

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12
Q

Battery Master Switch closes…

A

o Closes 3 contactors directly connecting all 3 batteries to the “Essential DC buses”

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13
Q

Main Battery Switch connects…

A

o Directly connects the Main battery to the “RIGHT Main DC bus” allowing a two-way power flow

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14
Q

Auxiliary Battery Switch connects…

A

o Directly connects the Aux battery to the “LEFT Main DC bus” allowing a two-way power flow

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15
Q

Standby Battery Switch connects…

A

o Directly connects the Standby battery to the “LEFT Main DC bus”, allowing a “one-way” power flow (battery charging ONLY)

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16
Q

BATTERY TEMPERATURES
• WHITE
• AMBER
• RED

A

normal range
when 50° C to 65° C
temperature greater than 65° C

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17
Q

How many Engine Driven Starter-Generators

A

2

18
Q

Engine Driven Starter-Generators

•Driven by the___ of each engine and are___cooled

A

engine accessory gearbox, air

19
Q

Engine Driven Starter-Generators

• Each DC Starter-generator is monitored and controlled by its respective___

A

Generator Control Unit (GCU)

20
Q

Engine Driven Starter-Generators
• After engine start and NH of___, the GCU converts the starter-generator from a starter mode of operation to a generating mode

A

50%

21
Q

Engine Driven Starter-Generators

• GCU also ensures that the generator maintains a constant supply of (volts and amps) to its associated…

A

28.5v DC, 400 amps, “Main DC bus”

22
Q

Engine Driven Starter-Generators
• Electrical Emergency occurs when a failure on___“DC Generators” AND___
. The EPCU automatically disconnects the batteries from the “Main buses” leaving them only able to supply power to the___ for approximately___

A

BOTH, a third AC power source failure (i.e. AC TRU) total 3 items. “Essential buses” (approximately 45 minutes).

23
Q 
DC GPU (Ground Power Unit)
•	Receptacle located on\_\_\_
A

the left side of the nose of the aircraft

24
Q 
DC GPU (Ground Power Unit)
•	Power is directly received by the \_\_\_
A

“LEFT Main DC bus”

25
Q 
DC GPU (Ground Power Unit)
•	“Auto Bus Tie” Closure enables \_\_\_
A

ALL 6 DC Buses to be powered

26
Q 
DC GPU (Ground Power Unit)
•	Engine DC generators and the APU generator are inhibited from coming online while in \_\_\_ configuration
A

Auto Bus Tie

27
Q 
DC GPU (Ground Power Unit)
•	EPCU will automatically disconnect if the external DC voltage drops below \_\_\_ or exceeds \_\_\_
A

22 volts, 31 volts

28
Q

Main Bus Fault
• Electronic Power Control Unit (EPCU) confirms an actual “Main Bus Fault” and will automatically take offline all ___ components associated with the faulty bus (___) leaving the fault bus unpowered and isolated
• Abnormal Checklist will instruct the crew to cycle the “Bus Fault Reset” switch in an attempt to reset the EPCU’s bus fault protection logic

A

DC, (i.e. DC starter-generator & batteries)

29
Q

How many TRUs

A

2

30
Q

TRU’s

•Located in the___ section of the nose and are___-cooled

A

upper right, air

31
Q

TRU’s

•Converts___

A

115vAC to 28vDC

32
Q

• Each TRU then supplies___ power to its respective ___

A

28vDC, “Secondary DC Bus”

33
Q

APU GENERATOR

• Supplies ___ power to the ___ during ground operations only

A

28vDC, “Essential, Main, and Secondary DC buses”

34
Q

APU GENERATOR

• Provides ___power in parallel with the___

A

28vDC, Engine DC Starter-generators

35
Q

How many AC Generators and voltage

A

2, 115vAC

36
Q

AC GENERATORS

• Mounted on (driven by) the ___ and ___ cooled

A

propeller reduction gearbox and oil-cooled

37
Q

AC GENERATORS

• Power is supplied to the___ busses

A

“Left and Right variable AC buses”

38
Q

AC GENERATORS

• The following systems and components require 115 volt variable AC power: (5)

A 
o	De-Icing/Anti-Icing Heaters
o	Standby Hydraulic pump (#1 Hydraulic    System)
o	Transformer Rectifier Units (TRUs)
o	#1 and #2 Auxiliary Fuel pumps
o	Galley loads
39
Q

AC GENERATORS

• AC power will ___ provide support for engine start

A

Not

40
Q

• AC External Power can power ___ via the ___

A

ALL “AC & DC Buses”, TRU’s

Dash 8 Q400 2 (16 decks)

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