Fuel System Flashcards

1
Q

Fuel distribution in A/C?

A

70% fuselage and 30% wings

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2
Q

Total Capacity (Internally)

A

2000kg

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3
Q

Fuel Control Panel located where?

A

Left side of the A/C nose

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4
Q

How many internal tanks?

A

4

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5
Q

What are the internal tanks?

A

Collector, Main, 2x Wing

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6
Q

Capacity of collector tank

A

210kg

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7
Q

Capacity of main tank

A

1230kg

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8
Q

Capacity of each wing tank

A

280kg

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9
Q

Where are the fuel pumps housed?

A

Collector tank

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10
Q

How is the collector tank kept full?

A

2 transfer jet pumps from the main tank

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11
Q

Where is the tube in the collector tank that allows venting to the main tank?

A

Top

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12
Q

Why does the main tank have internal structure?

A

To dampen sloshing

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13
Q

Which tank is crossed by the most fuel system piping?

A

Main

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14
Q

Wing tanks are ___-type

A

box

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15
Q

How many cells are the wing tanks divided into by spars and ribs?

A

17

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16
Q

What forms the roof and floor of the wing tanks?

A

Wing skin

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17
Q

How are the wing tanks connected to the main tank?

A

Pipes and non-return valves

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18
Q

How many external tanks available?

A

Up to 3

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19
Q

Capacity of each external tank

A

500kg

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20
Q

How many compartments are the external tanks divided into?

A

3

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21
Q

Why are the external tanks divided into compartments?

A

To control CG

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22
Q

All equipment necessary for the external tank is located ______

A

within the tank

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23
Q

Under what conditions are the external tanks jettisonable?

A

No WoW

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24
Q

How are the tanks refueled?

A

Single point pressure refueling receptacle

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25
Q

Which tanks can be gravity refueled?

A

Collector and main (NOT wings)

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26
Q

FCP stands for what?

A

Fuel Control Panel

27
Q

FCP must be ____ to enable air refuel, must be at _____ to enable ground refuel.

A

OFF, ON

28
Q

FMS automatically stops fueling when reaching _________

A

preset quantity

29
Q

What type of air refueling?

A

Probe and drogue type

30
Q

What is the air refueling system connected to?

A

ground pressure refueling line

31
Q

Where is the AAR probe mounted?

A

Right side of the front fuselage

32
Q

What is the AAR probe controlled by?

A

FCP A/R push-button indicator

33
Q

How long will the A/R push-button indicator flash for before the AIR REFUEL legend appears on the HUD?

A

5 seconds

34
Q

What is confirmed by the steady illumination of green light on A/R indicator?

A

Fuselage vent and all shut off valves for ext tanks are open.

35
Q

T/F: AAR stops automatically if tanks are full or probe disengages.

A

True

36
Q

T/F: Breaking the probe will cause a fuel leak.

A

False, probe can be broken without fuel spillage

37
Q

How to close all applicable valves before proceeding w mission?

A

Press the A/R push-button again

38
Q

Vent valve connected from _____ tank to _______

A

main, tail cone

39
Q

Vent valve is _______ operated for re/defueling and _____ operated during alt variations.

A

motor, spring

40
Q

External tanks are vented by what?

A

Their own valves

41
Q

Order for fuel transfer:

A
  1. Main tank upper section
  2. Ext fuselage centerline tank (if installed)
  3. External underwing tanks (if installed)
  4. Main tank middle section and wing tanks
  5. Main tank bottom section
  6. Collector tank
42
Q

Wings to main tank happens via _____

A

gravity

43
Q

FMS accepts asymmetries up to ______

A

50kg

44
Q

How does the FMS restore symmetry?

A

Forcing fuel transfer via a jet pump

45
Q

UNBALANCE Caution if >____kg asymmetry for >____sec

A

100, 30

46
Q

During normal ops, when fuel in each wing reaches <____kg, both jet pumps start to drain the wings

A

50

47
Q

Which cautions indicate that forced fuel transfer will be inhibited?

A

[L or R] FUEL P or ACCURACY

48
Q

Collector tank remains full at flight attitudes up to ____ deg

A

40

49
Q

Emergency fuel transfer to collector tank via

A

flapper valve at bottom of the tank

50
Q

Fuel transfer from ext tanks initiated automatically when fuel decreases below ___________

A

optical sensor in main tank (850-800kg)

51
Q

If fuel in main tank decreases below optical sensor for ___sec and the underwing tanks still have gas, _______ caution is displayed

A

20, FUEL XFER

52
Q

If unbalance in excess of ____kg for underwing tanks, FMS closes transfer valve of ______ tank

A

50, emptier

53
Q

UNBALANCE caution comes on w unbalance >____kg for >____sec

A

100, 30

54
Q

How many AC/DC (lol) fuel pumps?

A

2 AC, 1DC

55
Q

What is the DC pump for?

A

starting, APU, or emergencies
does not provide motive flow for jet pumps

56
Q

When are AC pumps energized, and what happens to the DC pump?

A

one engine running or ext AC power
it is de-energized

57
Q

DC pump is plugged into ____ engine feed in case of failure of AC pumps, the ____ engine is suction fed (must descend below _____ft MSL) as the x-feed valve is closed.

A

right, left, 20k

58
Q

In case of single AC pump failure, ___________ allows one pump to feed both engines.

A

crossfeed valve

59
Q

Fuel quantity measured by ___ probes in collector and main, ___ in each wing, and ___ in each external tank.

A

4, 3, 3

60
Q

Total fuel qty computed by ___ and provided w resolution of ___kg

A

FCP, 10

61
Q

FUEL LOW caution

A

<380+/-20kg in fuselage tank

62
Q

COLLECTOR caution

A

<150+/-20kg in collector tank

63
Q

TANK HP caution

A

28 kPag

64
Q

TANK LP caution

A

-7 kPag