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Republic E170 > Fuel > Flashcards

Fuel Flashcards

1
Q

Crossfeed Selector Knob LOW 1 (2)/OFF

A 
LOW 1 (2) - opens crossfeed valve and activates AC fuel pump, supply fuel to both engines from one wing tank
OFF - closes crossfeed valve
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2
Q

DC Fuel Pump Selector Knob AUTO/OFF/ON

A

OFF - deactivates DC fuel pump
AUTO - operates DC fuel pump according to system logic
ON - activates the DC fuel pump

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3
Q

AC Fuel Selector Knob AUTO/OFF/ON

A

OFF - deactivates associated AC fuel pump
AUTO - operates AC fuel pumps according to system logic
ON - activates the AC fuel pump

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4
Q

Each wing tank incorporates:

A
  • a collector tank

- a surge tank

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5
Q

What is the purpose of the collector tank

A

keeps fuel pumps submerged ensuring a constant fuel flow

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6
Q

Describe vent tank

A

ensures a differential pressure between tank and ambient and prevents fuel spillage during flight maneuvers, vented through vent lines and supplemented by a high capacity pressure relief valve to guard against fuel tank overpressure

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7
Q

Fuel quantity indication

A
  • thirteen electrical sensors in each tank
  • additional independent fuel low lever sensor
  • three magnetic level indicator under each wing
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8
Q

Each fuel tank contains the following pumps

A
  • ejector fuel pump
  • AC electric fuel pump
  • three scavenge ejector pumps
  • DC electric fuel pump (right tank only)
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9
Q

Describe the primary ejector pump

A
  • venturi ejector pump
  • no moving parts
  • powered by motive flow
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10
Q

The AC electric fuel pump supplies fuel to the following components

A
  • onside engine during engine starts
  • cross side engine during crossfeed operations
  • APU when engine is not running
  • backup if ejector pump fails
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11
Q

What busses power which AC fuel pump

A

left - AC BUS 1

right - AC ESS BUS

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12
Q

Describe the scavenge ejector pumps

A

three scavenge jet pumps maintain fuel level in collector tank

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13
Q

Describe the DC fuel pump

A
  • installed in right wing only
  • provides pressurized fuel for APU operation and engine start when AC pumps not available
  • powered by DC ESS BUS 2
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14
Q

When will the fuel low level warning activate

A

660 lbs remaining in associated tank

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15
Q

FUEL 1 or 2 LO LEVEL warning

A

low level senors indicate that 660 lbs of fuel remain in respective tank

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16
Q

APU FUEL SOV FAIL caution

A

shutoff valve is not in the commanded position

17
Q

ENG 1 or 2 FUEL SOV FAIL caution

A

associated shutoff valve is not in the commanded position

18
Q

FUEL IMBALANCE caution

A

indicates an imbalance of fuel between the two tanks of greater than or equal to 800 lbs. it remains displayed until the imbalance is reduced to 100 lbs

19
Q

FUEL TANK LO TEMP caution

A

temperature sensed in the left collector bay is less than or equal to -40C

20
Q

FUEL XFEED FAIL caution

A

indicates a discrepancy between the cockpit control position and either the valve position or the affected pump status

21
Q

DEFUEL SOV OPEN advisory

A

defuel shutoff valve is open

22
Q

FUEL AC 1 or 2 PUMP FAIL advisory

A

indicates a discrepancy between the commanded and actual pump state

23
Q

FUEL DC PUMP FAIL advisory

A

indicates a discrepancy between the commanded and actual pump state

24
Q

FUEL EQUAL XFEED OPEN advisory

A

the imbalance is less than 100 lbs and the crossfeed valve is open

25
Q

FUEL FEED 1 or 2 FAULT advisory

A

respective AC pump is ON due to a failure in the primary engine feed system. The message will not be displayed when the respective N2 is less than idle.

26
Q

FUEL KG-LB MISMATCH advisory

A

label united defined at FCU do not agree with label unit set on the EICAS

27
Q

APU FUEL SOV CLOSED status

A

APU fuel shutoff valve is fully closed

28
Q

ENG 1 or 2 FUEL SOV CLOSED status

A

associated engine shutoff valve is fully closed

29
Q

FUEL XFEED SOV OPEN status

A

crossfeed valve is open and associated AC fuel pump is operating

Republic E170 (22 decks)

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