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Fuel System Flashcards

(65 cards)

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1
Q

What are the two separate fuel systems in the aircraft?

A

UT system and LR system

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2
Q

How many internal fuel tanks does the UT system have?

A

2 internal 500 gal tanks

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3
Q

What is the usable fuel capacity of each tank in the UT system?

A

489 gallons

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4
Q

What methods are available for refueling the UT system?

A

Gravity refueling and single point refueling

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5
Q

What type of fuel gauges are used in the UT system?

A

Rotary bug fuel quantity gauges

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6
Q

What components are included in the fuel tanks for the UT system?

A

Outer assembly, inner fuel cell, support structure, 2 submerged boost pumps, capacitance type fuel probes, thermistor

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7
Q

Where are the submerged boost pumps located in each tank?

A

One forward and one aft

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8
Q

What material is used for the bladder inside each fuel tank?

A

Crashworthy hycatrol cell material

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9
Q

What is the purpose of the baffles inside the fuel tank?

A

To prevent sloshing

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10
Q

What is the purpose of the check valves located at each pump?

A

To prevent backwards flow

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11
Q

What happens if one boost pump fails?

A

Unusable fuel increases by 100 lbs in that tank

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12
Q

What type of switch is located at the common fuel outlet of each tank?

A

Pressure switch

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13
Q

What illuminates the annunciator light LFUEL BOOST or R FUEL BOOST?

A

Pressure is 10 PSI or less

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14
Q

What compensates for fuel density variations in the tanks?

A

Capacitance type fuel probes

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15
Q

How can low fuel indication be determined in each tank?

A

Thermistor in one probe provides indication when approx. 600 lbs in cruise or 1,000 lbs in hover

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16
Q

How is fuel removed from the tanks for measurement?

A

Using a fuel dipstick through the gravity refuel port

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17
Q

What is the role of the engine driven fuel pump?

A

To maintain engine operation up to 15,000’ PA

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18
Q

What is the design feature of tank vents during a rolling crash?

A

They are designed to prevent fuel spillage

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19
Q

What is the configuration of the plumbing in the fuel system?

A

Break-away fittings that seal to keep fuel inside the lines

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20
Q

Where are the fuel tanks mounted in relation to the aircraft structure?

A

Mounted to three aluminum support cradles on isolation beams

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21
Q

What are the two AC boost pumps connected to?

A

Different AC buses

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22
Q

Fill in the blank: Each tank has a _______ that allows fuel out.

A

T-handle

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23
Q

True or False: A failure of a single boost pump would illuminate the FUEL BOOST annunciator.

A

False

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24
Q

What connects the main fuel lines in the fuel system?

A

Tees and a single crossfeed line with a valve

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25
What is the purpose of the breakaway fitting in the fuel system?
Typical component in fuel line assembly
26
What does the FWD BOOST PUMP do in the fuel system?
Pumps fuel from the RH FUEL TANK
27
What is the function of a check valve in a fuel system?
Prevents backflow of fuel
28
Fill in the blank: The _______ is used for pressure refueling in the fuel system.
Pressure refueling crossover tube
29
What type of fuel tank is used in the LR tanks?
Bladder type fuel cell
30
What is the capacity of each LR tank?
1050 gallons
31
What material is used for the fuselage pods housing the fuel tanks?
Nomex honeycomb core with a Kevlar skin
32
What is the purpose of the baffles in the fuel cell?
Minimize weight shift
33
What does the calibrated magnetic fuel quantity indicator do?
Indicates the amount of fuel in the tank
34
What is the function of the jettison chute in the fuel system?
Allows safe jettisoning of fuel
35
What happens when the jettison switch is set to 'Open'?
Fuel jettisons at 60 GPM until 175 gallons remain
36
What unique feature does the aft boost pump have?
Bell mouth fitting for suction from the tank
37
What is the role of the high-level shutoff valve during refueling?
Prevents over-pressurization of the tank
38
Fill in the blank: The tank fills, causing the float assembly to float and close the _______.
Plunger on valve body
39
What does the APU boost pump do?
Provides fuel to the APU
40
What are the three positions of the jettison switch?
NORM, Extend, Open
41
True or False: The fuel cell in the LR tanks is a rigid structure.
False
42
What is the purpose of the suction foot in the fuel system?
Ensures fuel is drawn from the tank
43
What type of valve is used for engine motor operation?
Engine motor operated valve
44
What is the purpose of the pressure transducer in the fuel system?
Measures fuel pressure
45
What is the fuel flow rate during jettisoning?
60 GPM
46
What happens when the fuel boost pressure is less than 10 PSI?
The LOW FUEL BOOST caution light illuminates. ## Footnote This indicates a potential issue with fuel pressure that could affect engine performance.
47
How can the engine shut off valves be closed?
By pulling the fire t-handle. ## Footnote This is a safety feature to shut off fuel in case of a fire.
48
How many fuel probes are there in the LR tank?
Three probes. ## Footnote The middle probe contains a thermistor for the low fuel light.
49
What is the weight capacity of the UT gauge?
0-3,700 lbs.
50
What is the weight capacity of the LR gauge?
0-7,400 lbs.
51
What must be powered for the fuel shutoff bugs to work?
The battery must be on.
52
Where are the 28 VDC shutoff valves located?
On the sides of the ramp area. ## Footnote These valves control the main fuel lines.
53
How is the crossfeed valve operated?
By pulling the fire T handles.
54
What does the FEED VALVE switch control?
It controls the crossfeed valve. ## Footnote This allows both tanks to feed either engine.
55
What is the minimum fuel level for CHI to use crossfeed?
1,000 lbs in UT configuration or 1,200 lbs in LR configuration.
56
What type of refueling system is mentioned?
Pressure refueling system.
57
What can be controlled from the cockpit during refueling?
Refuel valves and quantity gauges.
58
What prevents structural damage during refueling?
Shutoff valves in each tank close the line when the right amount of fuel has been received.
59
What is a limitation of gravity refueling?
It is impossible to completely top off the tanks due to tank design.
60
What is the purpose of suction pickups in the fuel tanks?
To allow engine-driven fuel pumps to suck fuel even if both boost pumps fail.
61
What happens when fuel level is below 600 lbs in one tank?
It may expose the aft fuel boost pump and suction foot to air.
62
What actions are taken when the FUEL LOW annunciator illuminates?
* All fuel boost pumps are turned on * Airspeed limited to 100 KIAS or whichever is slower * Both LCTs manually selected to full extend * Fuel quantity indicator checked.
63
How does external load affect aircraft attitude?
It makes the aircraft fly with a more nose low attitude.
64
What does the ferry fuel system contain?
2 500L blivets, a cradle, transfer system, and some controls.
65
What is a potential future addition to the training material?
Information about the ferry fuel system.

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