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(M) Technical and Resource Knowledge > Fuel System > Flashcards

Fuel System Flashcards

1
Q

(O) What is the purpose of the collector tanks?

A

To provide positive fuel flow to the engines and to keep the Main ejectors / AC fuel pumps submerged.

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2
Q

(B) Name the different fuel tanks

A

Main tanks, collector tanks and surge tanks

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3
Q

(B) Where is fuel tank temperature taken?

A

Left side

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4
Q

(B) What types of fuel pumps are in each wing?

A
  • Primary ejector pumps
  • AC Pumps
  • DC Pumps
  • 3 Scavenge pumps
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5
Q

(B) What is the purpose of the Fuel ACMP?

A
  • Back-up pump in case of a primary ejector pump
  • Engine Start
  • Cross-feed operations
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6
Q

(B) What is the purpose of the scavenge pumps?

A

Maintain fuel level in the collector box and keeps the ejector pumps submerged

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7
Q

(B) What pump(s) is used once an engine is started?

A

Associated primary ejector pump

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8
Q

(B) What is the purpose of the collector box?

A
  • Keeps the fuel pumps submerged

- Ensures constant fuel flow to the respective engine

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9
Q

(B) What is the surge/vent tank?

A
  • Collects fuel during wing-down maneuvers and returns it to the main tanks once the wings are level
  • Equalizes tank pressure with atmosphere in flight and refueling
  • This is accomplished through wing tank vent lines inside the tank to be expelled into the surge tanks which incorporates a high pressure relieve valve
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10
Q

(B) Can fuel be transferred from tank-to-tank or dumped overboard?

A

No, but during a cross-feed there is a slight transfer from the engine driven pump return line from the non-used side as a byproduct.

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11
Q

(B) What happens when the crossfeed switch is selected to LOW 1?

A
  • Cross-feed valve opens

- Commands ACMP 2 to ON and provide fuel from the right tank to both engines

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12
Q

(B) What is the only way to close the engine fuel SOV?

A

Pull the associated engine fire extinguisher handle

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13
Q

What will the fuel 1(2) LO LEVEL EICAS be presented?

A

600 lbs. of fuel remaining in the associated tank

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14
Q

(I) What is the average weight of fuel density?

A

6.767lbs. per US GAL

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15
Q

(I) MAX FUEL CAPACITY?

A

20,935lbs.

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16
Q

(I) UNUSABLE QUANTITY PER TANK?

A

75lbs.

17
Q

(I) MAX FUEL IMBALANCE?

A

794lbs.

18
Q

(I) MIN FUEL TANK TEMP?

A

-40°C

19
Q

(B) Can you cross-feed during T/O and Landing?

A

NO

20
Q

(T) Which tank does normal APU take from? can you use another tank if available and how?

A

Right Tank

Yes - LOW 2

21
Q

(O) What happens if the scavenger pumps stop working? Could you get any indication of this? And what should you consider?

A
  • Fuel from the collector box flows out so that the fuel level equalizes.
  • Yes, at 3,970lbs. you will received an EICAS WARNING Message FUEL 1 (2) LO LEVEL due to lower fuel quantity in the collector tank
  • Engine flameouts due to fuel starvation if attitudes greater than 15° nose-up or down, uncoordinated maneuvers, or negative G’s
22
Q

(T) How many Magnetic Level Indicators (MLI)? What is it for?

A
  • 3 on each wing

- Provides alternate means for fuel measuring

23
Q

(O) What is the DC Fuel Pump used for?

A

APU or Engine start, incase of no AC power

24
Q

(O) What is motive flow? explain the process.

A

Using fuel to move fuel. Engine driven pumps provide motive flow by returning some of the fuel extracted from the collector tank into the Main Tank.

25
Q

(O) How does the ejector pump work?

A

It uses a venturi effect, which basically increases fuel velocity to the engine.

26
Q

(O) Explain how the fuel is delivery to the engine?

A
  1. Ejector pump or AC pump provides pressure to the LP Engine driven pump.
  2. Fuel is then sent in two direction: To the heat exchanger or back into the fuel tank using a HP engine drive pump.
  3. Fuel from the heat exchanger goes through a filter (which has a bypass filter incase of a clog) then into a HP engine driven pump which deliver HP fuel to the Fuel Metering Unit (FMU) directed to the injectors.
27
Q

(B) When will the FUEL IMBALANCE EICAS message appear?

A

800lbs.

(M) Technical and Resource Knowledge (15 decks)

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