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Texan > SYS - Fuel System > Flashcards

SYS - Fuel System Flashcards

1
Q

How many integral fuel tanks?

A

3

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2
Q

How much usable fuel?

A

1100lbs - when using the primary refuel method

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3
Q

Two ways of refuelling?

A
  • pressure refuelling - single point adapter

- gravity fill - ports in each outer wing

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4
Q

Generically how is fuel fed to the engine?

A

Motive flow system - siphoning effect

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5
Q

Number and name of pumps for normal operation?

A

Engine driven low and high pressure pumps

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6
Q

What is electric boost pump for?

A

Engine starting

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7
Q

What supplies fuel during negative g?

A

A fuel pick up valve in the central collector tank

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8
Q

Is the fuel balancing automatic?

A

Yes

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9
Q

Name of fuel tanks?

A

Left wing
Collector
Right wing

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10
Q

Max fuel from overwing refuelling?

A

1200lbs

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11
Q

When primary refuelling how is fuel distributed (in lbs) between the three tanks?

A

Left and right = 530lbs

Collector tank = 40 lbs

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12
Q

Where is single point refuelling location?

A

Left side of fuselage just in front of the wing

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13
Q

How long does it take to refuel using pressure refuelling?

A

3-5 min

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14
Q

How does refuelling automatically shut off?

A

Level control pilot valves at each outboard wing closes the level control shut off valves when fuel reaches them

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15
Q

How much more in each wing can you get from overwing refuelling?

A

Extra 50lbs

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16
Q

Where is the manifold valve?

A

At the front of the collector tank

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17
Q

Does the fuel filter have a bypass?

A

Yes

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18
Q

How many fuel shutoff valves and how operated?

A

Two, firewall shutoff operated by the firewall shut off handle. Maintenance shut off valve.

19
Q

Is the fuel flow transmitter downstream or upstream of the FMU?

A

Downstream

20
Q

Where does excess fuel not used by the engine go?

A

Through a purge line back to the collector tank

21
Q

What drives the primary and transfer jet pumps?

A

Fuel from the low pressure pump sent down the motive flow line

22
Q

When is the electric boost pump activated? (2)

A
  • below 10psi in the motive flow line

- and, PCL is in start Ready position

23
Q

Primary jet pump takes fuel from where to where?

A

From collector tank to low pressure pump

24
Q

Transfer jet pumps take fuel from where to where?

A

Wing tanks to collector tanks

25
Q

Inverted flight should be limited to ______ seconds.

A

15

26
Q

How many fuel level probes and in which tanks?

A

7.

3 in each wing and 1 in the collector tank

27
Q

What does the fuel probe in the collector tank measure other than level?

A

Temperature compensation and fuel density

28
Q

How is fuel in the collector tank displayed on EICAS?

A

It is split between the two main wing tank indications

29
Q

When do fuel tapes turn yellow?

A

150lbs in respective tank

30
Q

When does respective L or R FUEL LO EICAS messages appear?

A

110lbs in a tank

31
Q

FP FAIL means?

A

There is a fuel probe failure

32
Q

FUEL PX (red)

A

Less than 10PSI in the motive flow line

33
Q

M FUEL BAL (green)

A

Anytime fuel balance switch is not in auto

34
Q

FUEL BAL

A

30 lbs imbalance for more than 2 min and auto system not corrected it. Also lights if fuel probe fails. Remains illuminated until fuel system is reset.

35
Q

BOOST PUMP (green) means? (One of three things)

A
  • boost pump switch is on
  • auto operation by low pressure switch
  • whenever starter is activated
36
Q

When does boost pump come on when switch is armed?

A

During start until 10PSI

37
Q

When can the boost pump be switch be turned to on?

A

Failure of the engine driven low pressure fuel pump

38
Q

How are tanks vented externally? (2)

A
  • pressure relief valve

- vacuum relief valve

39
Q

How are tanks vented internally to each other?

A

Cross vent line

40
Q

What does float valve in each wing tip do?

A

Prevents fuel from overfilling low tank when on a slope

41
Q

What does FUEL balance system try and maintain balance to within?

A

20lbs between tanks

42
Q

When does fuel balancing start?

A

More than 20lbs for greater than 30sec

43
Q

If an imbalance greater than 30lbs for 2 minutes is experienced does the AUTO balancing system shut off?

A

Yes

44
Q

If the AUTO balance system has shut off but still an imbalance of more than 30lbs how balance with AUTO system?

A

A reset will give another two minutes of balancing, may need to reset multiple times.

Texan (19 decks)

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