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Systems + Gen Ops > Fuel > Flashcards

Fuel Flashcards

1
Q

Describe the amplified procedure for the Fuel Pump check during the Before Start Check?

A

Turn both wing fuel pump power knobs to ON and select the desired fuel pumps. Ensure that the applicable pumps are annunciated on the MFD. The wing fuel pumps should be alternated each flight leg.

For the XR only, position ventral tank pump knob to the AUTO position. The ventral pumps should be alternated each flight leg.

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2
Q

Describe the operation of fuel crossfeed?

A

Fuel crossfeed allows us to supply fuel from a tank to the engine on the opposite side, or to feed the APU with the left wing. Crossfeed does NOT transfer fuel.

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3
Q

What is the minimum and maximum fuel tank temperature?

A

Minimum fuel tank temperature is -40ºC and the maximum fuel tank temperature is 52ºC.

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4
Q

When should automatic ventral tank transfer occur?

A

Ventral tank transfer will occur when both wing tanks have a fuel quantity less than 4,630 lbs for at least 30 seconds.

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5
Q

What are the MFD Fuel page indications of a fuel pump failure?

A

If one pump fails, the other two pumps will begin to cycle until another pump is selected. No EICAS message will be presented.

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6
Q

What is the maximum fuel imbalance?

A

800 lbs between wing tanks.

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7
Q

Is a takeoff allowed with the Fuel Imbalance EICAS message displayed?

A

Yes, as long as the fuel imbalance does not exceed 800 lbs between wing tanks. The EICAS message will remain illuminated until the imbalance is within 100 lbs. If the XFEED knob remains out of the OFF position below 100 lbs imbalance, then the FUEL EQ XFEED OPEN message will be presented.

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8
Q

What is the meaning of the EICAS message FUEL EQ XFEED OPEN?

A

Crossfeed valve remains open after fuel imbalance correction - difference between wing tanks fuel quantities less than 100 lbs
OR
Crew activated the wing fuel imbalance correction to the wrong wing tank.

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9
Q

What is the meaning of the EICAS warning message FUEL 1(2) LO LEVEL?

A

460 lbs of fuel remains in the respective tank (less than 30 minutes of fuel).

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10
Q

What is the meaning of the EICAS warning message FUEL XFER CRITICAL?

A

There is fuel inside the ventral tank and at least one wing tank quantity is 3130 lbs.

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11
Q

What is the meaning of the EICAS caution message FUEL XFER INOP?

A

Ventral tank automatic transfer system is inoperative or there is fuel in the ventral tank and the transfer system is OFF.

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12
Q

What is the meaning of the EICAS advisory message FUEL LR CONFIG?

A

Fuel system configuration is selected to LR. This is used if the ventral tank is MEL’d.

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13
Q

What happens when the crossfeed valve is placed to LOW 1?

A

The pump turns off in Tank 1 and the cross-feed valve opens so Engine #1 will be drawing from Tank 2.

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14
Q

What happens when the crossfeed valve is placed to LOW 2?

A

The pump turns off in Tank 2 and the cross-feed valve opens so Engine #2 will be drawing from Tank 1.

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15
Q

Tank 1 has 3500 lbs. Tank 2 has 3700 lbs. How should the crossfeed switch be positioned to balance fuel?

A

The switch should be set to LOW 1 until the fuel imbalance is less than 100 lbs.

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16
Q

Is it possible to transfer fuel between the main wing tanks?

A

No, fuel cannot be transferred between the two wing tanks.

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17
Q

What happens if the selected fuel pump fails?

A

The remaining wing pumps are automatically switched on and start cycling until the pilot selects one of them.

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18
Q

Is fuel crossfeed available without normal DC power?

A

Yes the Fuel XFEED valve is essentially powered.

19
Q

Can you transfer fuel from the Ventral Tank and crossfeed at the same time?

A

No, crossfeed operation inhibits ventral transfer.

20
Q

At what fuel order would you expect to see Ventral fuel added?

A

Fuel orders over 10,470 lbs.

21
Q

When is crossfeed operation permitted?

A

During all phases of operation, except for takeoff and go around.

22
Q

When is crossfeed operation NOT allowed?

A

Takeoff and Go Around.

23
Q

Which fuel tank normally supplied fuel to the APU?

A

The right fuel tank. Fuel Tank 2.

24
Q

When should the crew advise ATC of a minimum fuel status?

A

When unanticipated circumstances may result in landing at the destination or alternate with less than reserve fuel.

25
Q

When the fuel quantity indicating system is MEL’d, is the FUEL LO LEVEL EICAS message valid if illuminated?

A

Yes, the FUEL LO LEVEL message illuminates based on the actual fuel in the tank from the low level sensor and not based on the fuel values presented on the EICAS.

26
Q

Is it acceptable to depart the gate with less than planned fuel?

A

The aircraft can leave the gate with less than planned fuel (minimum fuel plus taxi) if the crew anticipates that MINF will not be compromised before takeoff.

27
Q

What is the fueling tolerance for ERJ aircraft?

A

The fuel loaded on the aircraft may not exceed the gate fuel figure listed on the Dispatch Release unless this amount is amended in cooperation with the Dispatcher. If during the fueling process, the fueler loads more fuel than ordered, the PIC does not have to contact Dispatch if the excess fuel amount does not exceed 400 lbs.

28
Q

Are Hot Fueling Operations allowed at XJT?

A

Yes; follow instructions in the QRH in the Normal Supplemental Information section.

29
Q

What technique may be used to determine Decision fuel over a flight planned waypoint?

A

Look at the present waypoint flight planned fuel on the release and subtract Hold, Contingency, and Extra Fuel. This will leave you with Burn to destination plus Alternate (if required) plus Reserve.

30
Q

When should “Emergency Fuel” be declared?

A

“Emergency Fuel” should be declared when less than 30 minutes of fuel is remaining.

Quick way of estimated emergency fuel: Take you 45 minute reserve fuel number on your release and multiple by .67.

31
Q

How do you configure the XR to LR configuration in regards to fuel?

A

Switch behind the wardrobe closet generates an EICAS advisory message FUEL LR CONFIG and illuminates the LR light on the refueling panel.

32
Q

What is the purpose of the flapper valves?

A

Flapper valves prevent fuel flow from root to tip. Keeps the fuel toward the root.

33
Q

How are the fuel pumps in the wings powered?

A

Pumps A and B: Essential

Pump C: DC

34
Q

How is the XFEED valve powered?

A

Essential

35
Q

How many fuel pumps are there on the LR? XR?

A

LR: 10 total pumps.
6 electric pumps
2 ejector pumps
2 engine driven pumps

XR: 12 total pumps.
6 electric pumps
2 ejector pumps
2 engine driven pumps
2 ventral pumps
36
Q

How much fuel does the APU burn per hour?

A

APU burns about 200 lbs of fuel per hour.

37
Q

How many fuel sensors are on the LR? XR?

A

LR has 6 fuel sensors per wing. XR has 7 fuel sensors per wing.

38
Q

What is the purpose of the Spark Arrester?

A

Spark Arrester prevents sparks from going up into the fuel tank.

39
Q

If you are running on engine driven fuel pumps only, when will you have to turn on the electric fuel pumps?

A

Above FL250

40
Q

What is the purposed of the Wing Tank Collector Box?

A

Keeps the electric pumps submerged in fuel.

41
Q

What is the FPMU?

A

FPMU - Fuel Pump Metering Unit

Sends the proper amount of fuel to the engines.

42
Q

How are the ejector pumps powered?

A

The ejector pumps are purely mechanical and do not require power. Keeps the fuel flowing (venturi effect).

43
Q

What are the surge boxes?

A

There is a surge box in each wing which helps with fuel venting. The surge boxes are connected to outside air
through a NACA air intake installed under the wing.

44
Q

Can the engine driven fuel pump provide enough fuel pressure for both engines?

A

Yes. As long as you do not exceed FL250.

Systems + Gen Ops (21 decks)

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