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T-6 Systems > Fuel System > Flashcards

Fuel System Flashcards

1
Q

How many integral fuel tanks does the T-6 use?

A

3

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2
Q

Approximately how much fuel does the T-6 hold?

A

1100 pounds of usable fuel

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3
Q

What are the two ways the T-6 can be refueled?

A

Single point and over the wing

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4
Q

Where is the single point refueling port?

A

On the left front fuselage

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5
Q

What kind of system is the fuel system?

A

Motive flow

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6
Q

What is motive flow?

A

As fuel moves through the lines, it creates a pressure differential between the fuel lines and fuel tanks. This causes a lower static pressure in the fuel lines and “siphons” fuel from the tanks

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7
Q

What does the electric boost pump do?

A

Provides fuel to the engine during startup or in case of failure of the engine driven low-pressure fuel pump

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8
Q

Where is the flip flop valve located?

A

The central collector tank

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9
Q

What does the flip flop valve do?

A

Supplies fuel feed during negative-G flight operations

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10
Q

What maintains fuel balance between the wings?

A

An auto-balancing system

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11
Q

What are the three fuel tanks called?

A
  • Left wing
  • Collector tank
  • Right wing
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12
Q

What are the two fuel pumps?

A
  • Engine-driven low pressure pump

- Engine-driven high pressure pump

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13
Q

How much fuel does each wing tank hold?

A

Approximately 530 lbs of fuel

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14
Q

How much fuel does the collector tank hold?

A

Approximately 40 lbs of fuel

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15
Q

What is the primary method of refueling?

A

Single point refueling

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16
Q

During single point refueling, how do the wing tanks fill?

A

Simultaneously

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17
Q

If empty, how does the collector tank receive fuel?

A

A gravity feed from the wing tanks

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18
Q

How long does it take to refuel the T-6 using single point?

A

3-5 minutes

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19
Q

How is refueling stopped once full?

A

Level control pilot valves

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20
Q

Where are the level control pilot valves located at?

A

The outboard tip of each wing

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21
Q

How do the level control pilot valves operate?

A

When fuel reaches the valves, which in turn causes the level control shutoff valves to close, halting fuel flow

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22
Q

How long does it take to defuel the T-6?

A

Approximately 5 minutes

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23
Q

What is the secondary method of refueling?

A

Over the wing gravity refueling

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24
Q

Where are the two ports for over the wing refueling?

A

One on top of each wing tank

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25
Q

If using over the wing refueling, how much extra fuel can be added to the tanks?

A

50 lbs per tank, 100 lbs total

26
Q

What are two restrictions to the over the wing method?

A

There is no automatic shutoff, and the system can’t be defueled from the over wing ports

27
Q

What does the electric boost pump do?

A
  • Provides fuel delivery for initial engine startups

- Also acts as a backup to the engine-driven low pressure pump

28
Q

What does the manifold valve do?

A

Connects the electric boost pump and primary jet pump to the engine feed line

29
Q

Where is the manifold valve located at?

A

The front of the collector tank

30
Q

What component does fuel travel to after the collector tank?

A

The fuel filter

31
Q

What does the fuel filter do?

A

Prevents contaminates from reaching the main fuel pumps or engine

32
Q

What is the fuel filter equipped with?

A

Fuel bypass

33
Q

What does the fuel bypass do?

A

Enables fuel flow to the engine if the fuel filter becomes restricted

34
Q

What two valves are located in the engine feed line?

A
  • Firewall shutoff valve

- maintenance shutoff valve

35
Q

What is the purpose of the firewall shutoff valve?

A
  • Stops fuel flow to the engine

- Actuated by Firewall Shutoff Handle

36
Q

What is the purpose of the maintenance shutoff valve?

A

Isolates the fuel system for engine or fuel filter maintenance

37
Q

Where does fuel travel after the fuel filter?

A

The engine-driven low pressure fuel pump

38
Q

Where does fuel travel after the engine-driven low pressure fuel pump?

A

The engine-driven high pressure fuel pump, based on engine requirements

39
Q

Where does fuel travel after the engine-driven high pressure fuel pump?

A

The FMU, which controls fuel delivery to the engine

40
Q

What transmitter is tripped after the engine-driven high pressure fuel pump?

A

The fuel flow transmitter

41
Q

What does the fuel flow transmitter send a signal to?

A

The AEDD, indicating fuel flow

42
Q

What happens to any fuel that’s not used by the engine?

A

Sent from the engine-driven high pressure fuel pump through a purge line back to the collector tank

43
Q

Why is some fuel routed from the low pressure fuel pump through the motive fuel line?

A

Powers the primary and transfer jet pumps

44
Q

What switch is located in the motive flow line?

A

10 psi low pressure switch

45
Q

What happens if low pressure in the motive flow line falls below 10 psi and the PCL is above the start ready position?

A
  • The electric boost pump is activated

- FUEL PX annunciator is illuminated

46
Q

What does the primary jet pump do?

A

Delivers fuel from the collector tank to the low pressure fuel pump

47
Q

What do the transfer jet pumps do?

A

Direct fuel from the wing tanks to the collector tank. This keeps the collector tank pressurized

48
Q

What concept causes the primary and transfer jet pumps to operate?

A

Venturi flow

49
Q

How many fuel level probes are there?

A

7

50
Q

Where are the fuel level probes located?

A

3 in each wing and 1 in the collector tank

51
Q

Where do the fuel level probes send a signal to?

A

AEDD for fuel quantity

52
Q

Where are the fuel low level sensors located?

A

Rear edge of the inboard ends of the wing tanks

53
Q

What do the fuel low level sensors do when fuel is low?

A

Illuminate L FUEL LO or R FUEL LO annunciators

54
Q

How much fuel illuminates a L or R FUEL LO annunciator?

A

110 pounds

55
Q

What is a normal fuel flow readout during cruise flight?

A

350 Pounds Per Hour (PPH)

56
Q

What causes the FUEL BAL annunciator to illuminate?

A
  • Indicates a fuel imbalance of 30 lbs or more for more than 2 minutes, and auto balancing system hasn’t corrected the problem
  • Also illuminates if a fuel probe has failed
  • Will remain illuminated until fuel system is reset
57
Q

What causes M FUEL BAL annunciator to illuminate?

A

Anytime the fuel balance switch is NOT in the AUTO position

58
Q

What is the purpose of the vent lines?

A

Provide vacuum and pressure relief for the wing tanks

59
Q

How are the wing tanks internally vented to each other?

A

Cross vent line

60
Q

What is the purpose of the float valve?

A

If the aircraft is parked on a sloped surface, the float valve keeps fuel from draining on the lower wing

61
Q

What does balance the fuel balance system maintain?

A

Within 20 lbs

T-6 Systems (12 decks)

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