Fuel Systems Flashcards

1
Q

How many fuel tanks does the airplane have?

A

2 integral tanks

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2
Q

Where is fuel tank temperature taken?

A

Left tank

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3
Q

What types of fuel pumps are in each wing?

A
  • Primary ejector pump
  • ACMP
  • DCMP right tank
  • 3 scavenge ejector pumps
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4
Q

What is the primary ejector pump?

A

Venturi pump

  • No moving parts
  • No electrical power used by onside engine
  • Powered by motive flow
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5
Q

What is the purpose of the ACMP?

A
  • Backup pump in case of primary ejector failure
  • Engine start
  • Crossfeed operations
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6
Q

What is the purpose of the DCMP?

A

Used for APU or engine start if AC power or the ACMP is not available

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7
Q

What is the purpose of the scavenge pumps?

A

Maintains fuel in the collector box

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8
Q

What pumps are used once the engine starts?

A

Associated primary ejector pump

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9
Q

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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10
Q

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 during refueling
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11
Q

Can fuel be transferred from tank to tank

or be dumped overboard?

A

No

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12
Q

What happens when the crossfeed switch is selected to low 1?

A
  • Crossfeed valve is opened
  • Commands the ACMP 2 to “ON” to provide fuel from the right tank to both engines
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13
Q

What is the only way to close the engine shutoff valve?

A

Pull the associated engine fire extinguishing handle

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14
Q

When will the “FUEL 1 (2) LO LEVEL”

EICAS message be presented?

A

660 lb of fuel remaining in the associated tank

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15
Q

What is the Minimum Fuel Temperature?

A
  • 40 degrees C
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16
Q

What is the Maximum Fuel Imbalance?

A

794 lbs.

17
Q

What is the TOTAL Maximum Fuel Capacity?

A

20,935 lbs.

18
Q

What is the Unusable Quantity per tank?

A

75 lbs. / 11 US gallons per tank

19
Q

What powers the Refuel/Defueling panel before engine start?

A

DC Hot BATT Bus 2

20
Q

How many fuel pumps exsist?

A

13 pumps total

21
Q

Name the 13 pumps of the Fuel System

A

2 Engine Driven Pumps

2 Primary (Main) Ejector Pumps

6 Scavenge Ejector Pumps (3 on each side)

2 AC Electric Pumps

1 DC Electric Pumps

22
Q

How many Electric Pumps are apart of the Fuel System?

A

3 Electric Fuel Pumps Total:

2 ACMP

1 DCMP

23
Q

How many “Ejector” pumps are there in the Fuel System?

Name them, please.

A

8 Ejector Pumps:

2 Primary Ejector Pumps (Located in the Collector tanks)

6 Scavenge Ejector Pumps (3 in each tank)

24
Q

What backs up the Ejector Pumps?

A

AC Fuel Pumps

25
Q

Which pump provides fuel to the APU when the EDP is not running?

A

ACMP 2

26
Q

When do the ACMPs automatically turn Off after landing?

A

Speed less than 50kts

+60 seconds

27
Q

When will ACMP 1 and 2 automatically activate?

A

Ground: Flaps > 0 AND

TL set to T/O …. or …. Ground speed > 50 kts

Flight: Engine/EDP failure

Flaps > 0