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T-6: Systems 1 > S107 - Fuel System > Flashcards

S107 - Fuel System Flashcards

1
Q

When is the maintenance shutoff valve used?

A

It is used when the fuel system for the engine or the fuel filter needs maintenance

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2
Q

What is venturi flow?

A

As fuel is forced through the pumps, there is a tapered restriction that causes an increase in the fuel flow velocity, creating a suction effect drawing additional fuel from the fuel tanks

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3
Q

What are the two fuel shutoff valves

A
  • Firewall Shutoff Valve
  • Maintence Shutoff Valve
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4
Q

Where is fuel stored in?

A
  • Right Wing Tank
  • Collector Tank
  • Left Wing Tank
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5
Q

What additional information does the collector tank fuel sesnor probe provide?

A

Temperature compensatino and fuel density measurements

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6
Q

What is the normal fuel flow readout for cruise?

A

350 PPH

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7
Q

What is the purpose of the primary jet pump?

A

To drive fuel from the collector tank into the engine-driven low pressure pump.

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8
Q

What is the purpose of float valves?

A

They prevent fuel from draining to the outside of the aircraft when the aircraft is parked on a slope.

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9
Q

What is the cause of this annunciator indication?

A

This occurs when the fuel level falls below 110 pounds in the respective tank.

I.E. If the right tanks fuel level is below 110 pounds, the annuncitaor will only illuminate R FUEL LO

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10
Q

How much fuel can be added via the gravity port method?

A

An additional 50 lbs per wing tank compared to the Single Point Refueling method. This makes the total fuel 1200 lbs.

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11
Q

What is motive fuel flow?

A

Motive fuel flow is when the fuel flowing througout the fuel lines creates a pressure differential between the fuel lines and fuel tanks, creating a siphoning effect.

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12
Q

What system of the T-6A detects a fuel imbalance and signals auto balancing?

A

The EDM (engine data manager)

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13
Q

What is the cause of this annunciator?

A
  • Fuel inbalance has exceeded 30 pounds for more than 2 minutes and the automated balacning system has failed.
  • It will also light is a fuel probe failed
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14
Q

When is the only time that the Manual Fuel Balance switch is functional

A

Only if the FUEL BAL switch is in the MAN/RESET position

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15
Q

Where are the gravity ports located?

A

They are located on the top of each wing tank.

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16
Q

What is the cause of this annunciator?

A

The low pressure switch reads a pressure below 10 PSI within the motive fuel line, meaing that the low fuel pressure delivery to the engine has failed.

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17
Q

How does the purge line work?

A

The excess fuel is driven by the engine-driven high pressure pump back into the collector tank

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18
Q

The arrows indicating fuel level on the AEDD will remain white until there is ____ lbs remaining the respective fuel tank, they will then turn _____.

A

150 lbs, yellow

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19
Q

How does the T-6A’s dihedral wings affect fuel flow?

A

Due to the dihedral wings, fuel flows toward the collector tank. This ensures that the primary jet pump, located at the bottom of the collector tank, is always enveloped in fuel

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20
Q

How do the T-6A wing tanks vent?

A

They are veneed into the atmosphere through vent lines providing vaccum and pressure relief within the tanks.

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21
Q

How does a L/R LO FUEL annunciator present it self?

A

If the optic sensors located on the inboard trailing edge of each wing tank senses a fuel quantity of less than 110 lbs

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22
Q

What does the manifold valve do?

A

It connects the boost pump and primary jet pump to the engine feed line.

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23
Q

How does the wing tanks internally vent to eachother?

A

Through the cross vent line.

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24
Q

How fast can the tanks be filled using Single Point Pressure Refueling?

A

3 to 5 minutes

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25
Q

How many pounds of useable fuel is stored in the T-6A using the primary fueling method?

A

Approx 1100 lbs

26
Q

How do the float valves work?

A

The float valves are installed in the vent opening at the tip of each wing tank and close when rising fuel reaches it

27
Q

What happens if the fuel filter becomes restricted?

A

The fuel filter contains a fuel bypass which will allow fuel to still flow

28
Q

What is the purpose of the engine-driven high pressure pump?

A

To drive the fuel flow from the engine-driven low pressure pump into the FMU and drives excess fuel through the Purge Line back into the collector tank

29
Q

How does the T-6A shutoff fuel flow when refueling?

A

Via the level control pilot valves located at the outboard tip of each wing. The valves close when fuel reaches them, causing the level control shutoff valves to close, halting fuel flow. This is done automatically.

30
Q

How is the firewall shutoff valve activated?

A

By the firewall shutoff handle in the FCP

31
Q

What is the purpose of the engine-drive low pressure pump?

A
  • The engine-driven low pressure pump provides fuel flow to the engine-driven high pressure-pump.
  • Some of the fuel from the engine-driven low pressure pump is used to feed the motive flow line
32
Q

What is the cause of this annunciator?

A

Indicates that the boost pump has been activated either by:

  • Turning the boost pump switch ON
  • Automatically by the operation of the low pressure switch
  • The start is activated
33
Q

What is the cause of this annunciator?

A

This annunciator is illuminated anytime that the fuel balance switch is not in the AUTO position

34
Q

If the auto balance system shuts off without reducing the fuel imbalance to 30 pounds or less, how long will it provide fuel balancing once reset?

A

2 minutes

35
Q

How does the auto balance system work?

A

If an imbalance is deteched by the EDM of 20 pounds or more for more than 30 seconds, the appropriate transfer (solenoid) valve is activated and closes the motive flow line to the lighter fuel tank, rebalancing the fuel tanks because the heavier fuel tank’s fuel is transfered to the collector tank

36
Q

Why is Single Point Pressure refueling the primary source of refueling?

A

It refuels both wing tanks simultaneously.

37
Q

How long will this annunciator stay lit?

A

Until the fuel system is reset

38
Q

What do vent lines do?

A

They provide vacuum and pressure relief to the fuel tanks

39
Q

What is the purpose of the purge line?

A

Excess fuel that the FMU does not send to the engine is sent into the pruge line.

40
Q

Is there an automatic fuel shutoff for the gravity port refueling method?

A

No

41
Q

What are the pre-check valves used for and how do they work?

A

The pre-check valves are used to test if the shutoff valves are operational. The pre-check valves are next to the single point pressure adapater. When each valve is opened, fuel is fed directly to the respective pilot valve, which in turn shuts down fuel flow within a few seconds, if the valves are operational.

42
Q

How many integral fuel tanks are built into the T-6A and where?

A

3 integral tanks built into the single piece wing

43
Q

How many fuel probes does the T-6A have and where?

A

7 total fuel probes. 3 in each wing tank and 1 in the collector tank

44
Q

What controls fuel delivery to the engine?

A

The FMU

45
Q

What is the purpose of the fuel filter?

A

To prevent contaminants from entering the main fuel pumps or engine

46
Q

How do the primary and transfer jet pumps operate?

A

Venturi Flow

47
Q

What fuel line drives the primary and transfer jet pumps?

A

The motive fuel line.

48
Q

What pressurizes the motive fuel flow line?

A

Engine driven low pressure pump

49
Q

What is the electric boost pump used for?

A
  • Provides fuel flow for inital engine start up
  • Serves as a back-up if the engine driven low pressure fuel pump fails, turned on by the activation of the low-pressure switch at 10 PSI
50
Q

Where does the fuel come from that the engine-driven low pressure pump uses?

A

Fuel from the engine feed line is driven by the primary jet pump.

51
Q

Is fuel flow during Single Point Pressure refueling shutoff automatically or manually?

A

Automatically by the level control pilot valves in each wingtip.

52
Q

How does the flip flop valve work?

A

A weighted rod in the pickup valve closees off normal fuel pickup and opens the inverted fight pickup. This provides a minimum of 60 seconds of fuel regardless of orientation and prevents air ingestion into the fuel system

53
Q

What is the purpose of the fuel flow transmitter?

A

To send a signal to the AEDD

54
Q

What are the two refueling methods?

A
  • Single Point Pressure (Primary)
  • Gravity Port
55
Q

How many pounds of fuel can be stored in the right and left wing tanks?

A

Approx 530 lbs

56
Q

What is the purpose of the transfer jet pumps?

A

The pull fuel from the wing tanks into the collector tank, keeping the collector tank pressurized.

57
Q

At what fuel level does the auto balacning system keep the wing tanks within compared to eachother?

A

Within 20 lbs of eachother

58
Q

Where is the electric boost pump located?

A

In the collector tank

59
Q

What is the flip flop valve?

A

The flip flop valve allows for fuel to feed to the engine during negative-G flight

60
Q

What is the purpose of the motive fuel line?

A

The motive fuel line provides fuel used to drive the primary and transfer jet pumps.

61
Q

How many pounds of fuel can be stored into the collector tank?

A

Approx 40 lbs

62
Q

How can the T-6A be defueled?

A

Only through the Single Point Refueling method. Suction is applied at the adapater causing the defuel valve in the collector tank to open, then the fuel in the wing tanks is gravity fed into the collector tank. This process takes approx 5 minutes

T-6: Systems 1 (10 decks)

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