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T-6 Systems > Fuel System > Flashcards

Fuel System Flashcards

(61 cards)

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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
If using over the wing refueling, how much extra fuel can be added to the tanks?
50 lbs per tank, 100 lbs total
26
What are two restrictions to the over the wing method?
There is no automatic shutoff, and the system can't be defueled from the over wing ports
27
What does the electric boost pump do?
- Provides fuel delivery for initial engine startups | - Also acts as a backup to the engine-driven low pressure pump
28
What does the manifold valve do?
Connects the electric boost pump and primary jet pump to the engine feed line
29
Where is the manifold valve located at?
The front of the collector tank
30
What component does fuel travel to after the collector tank?
The fuel filter
31
What does the fuel filter do?
Prevents contaminates from reaching the main fuel pumps or engine
32
What is the fuel filter equipped with?
Fuel bypass
33
What does the fuel bypass do?
Enables fuel flow to the engine if the fuel filter becomes restricted
34
What two valves are located in the engine feed line?
- Firewall shutoff valve | - maintenance shutoff valve
35
What is the purpose of the firewall shutoff valve?
- Stops fuel flow to the engine | - Actuated by Firewall Shutoff Handle
36
What is the purpose of the maintenance shutoff valve?
Isolates the fuel system for engine or fuel filter maintenance
37
Where does fuel travel after the fuel filter?
The engine-driven low pressure fuel pump
38
Where does fuel travel after the engine-driven low pressure fuel pump?
The engine-driven high pressure fuel pump, based on engine requirements
39
Where does fuel travel after the engine-driven high pressure fuel pump?
The FMU, which controls fuel delivery to the engine
40
What transmitter is tripped after the engine-driven high pressure fuel pump?
The fuel flow transmitter
41
What does the fuel flow transmitter send a signal to?
The AEDD, indicating fuel flow
42
What happens to any fuel that's not used by the engine?
Sent from the engine-driven high pressure fuel pump through a purge line back to the collector tank
43
Why is some fuel routed from the low pressure fuel pump through the motive fuel line?
Powers the primary and transfer jet pumps
44
What switch is located in the motive flow line?
10 psi low pressure switch
45
What happens if low pressure in the motive flow line falls below 10 psi and the PCL is above the start ready position?
- The electric boost pump is activated | - FUEL PX annunciator is illuminated
46
What does the primary jet pump do?
Delivers fuel from the collector tank to the low pressure fuel pump
47
What do the transfer jet pumps do?
Direct fuel from the wing tanks to the collector tank. This keeps the collector tank pressurized
48
What concept causes the primary and transfer jet pumps to operate?
Venturi flow
49
How many fuel level probes are there?
7
50
Where are the fuel level probes located?
3 in each wing and 1 in the collector tank
51
Where do the fuel level probes send a signal to?
AEDD for fuel quantity
52
Where are the fuel low level sensors located?
Rear edge of the inboard ends of the wing tanks
53
What do the fuel low level sensors do when fuel is low?
Illuminate L FUEL LO or R FUEL LO annunciators
54
How much fuel illuminates a L or R FUEL LO annunciator?
110 pounds
55
What is a normal fuel flow readout during cruise flight?
350 Pounds Per Hour (PPH)
56
What causes the FUEL BAL annunciator to illuminate?
- 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
What causes M FUEL BAL annunciator to illuminate?
Anytime the fuel balance switch is NOT in the AUTO position
58
What is the purpose of the vent lines?
Provide vacuum and pressure relief for the wing tanks
59
How are the wing tanks internally vented to each other?
Cross vent line
60
What is the purpose of the float valve?
If the aircraft is parked on a sloped surface, the float valve keeps fuel from draining on the lower wing
61
What does balance the fuel balance system maintain?
Within 20 lbs

T-6 Systems (12 decks)

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