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Fuel system Flashcards

1
Q

NATOPS Chap 2

Fuel System

The fuel system is…

A

“a crashworthy, suction type, self sealing tank”

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2
Q

NATOPS Chap 2

Fuel System

All Fuel lines include…

A

“self-sealing breakaway valves that stop fuel flow in the event of fuel system damage”

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3
Q

NATOPS Chap 2

Fuel System

How is fuel drawn

A

via the Engine driven boost pump and then pumped thru the engine filter to the HMU hi Px pump

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4
Q

NATOPS Chap 2

Fuel System

Describe the main fuel tank

A

It is composed of two cells interconnected to form one tank. The system capacity is 590 usable gallons (4012lbs JP5). Its max capacity is 592 gallons

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5
Q

NATOPS Chap 2

Fuel System

What portion of the lower cell tank is self-sealing?

A

the lower 1/3

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6
Q

NATOPS Chap 2

Fuel System

Where is the main cell interlock?

A

Between 270-600lbs/side

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7
Q

NATOPS Chap 2

Fuel System

Describe the external tanks

A

“Crashworthy, ballistically hardened 120 or 113 gallon capacity.” (we fly with 120 gal tanks)

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8
Q

NATOPS Chap 2

Fuel System

How does the tank send a signal to the cockpit when its empty?

A

Each tank has a low-level thermistor sensor that is only exposed when the tank is empty. Thus sending a signal to the cockpit.

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9
Q

NATOPS Chap 2

Fuel System

What does a PUMP/VALVE Fail caution mean?

A

A single valve or pump fails, therefore the other pump or valve will supply fuel transfer capabilities

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10
Q

NATOPS Chap 2

Fuel System

What does an AUTO FUEL XFER FAULT caution mean?

A

This indicates a lack of fuel transfer from the aux tank(s) to the main tank(s). A lack of fuel may be caused due to a failed closed transfer valve, both transfer/dump pumps inop, FMCP control failure, or a blockage in the associated fuel lines. *FUEL may be unavailable

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11
Q

NATOPS Chap 2

Fuel System

What if the right Cell fills faster than the Left?

A

Monitor the fuel quantity gauges closely. If difference in cell quantities persists, stop transferring fuel before right cell is full ~1700lbs

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12
Q

NATOPS Chap 2

Fuel System

At what fuel level do you wait to conduct unmonitored manual transfer?

A

You must wait until main tank is below 3200lbs.

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13
Q

NATOPS Chap 2

Fuel System

When should you check Man fuel transfer?

A

After the main tank has burned ~300lbs

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14
Q

NATOPS Chap 2

Fuel System

At what point can you no longer jettison the Aux Tanks?

A

300lbs… It is really 272, but the tanks only read in 50lb increments

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15
Q

NATOPS Chap 2

Fuel System

At what fuel load is Auto transfer initiated?

A

2640lbs
(The point at which the main fuel tank level is depleted to the point that it can accommodate a complete external tank during a transfer)

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16
Q

NATOPS Chap 2

Fuel System

What type of sensors are the tank probes?

A

Capacitance-type sensors that EMPLOY fuel as a dielectric to measure the weight of the fuel in each tank.

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17
Q

NATOPS Chap 2

Fuel System

What is the Min dump rate?

A

800lb/min

18
Q

NATOPS Chap 2

Fuel System

Can fuel be dumped with WOW engaged?

A

Yes

19
Q

NATOPS Chap 2

Fuel System

What is the PSI with the pressure refueling port?

A

55psi

20
Q

NATOPS Chap 2

Fuel System

The HIFR system consists of…

A

“Wiggins quick disconnect, pressure-refueling fitting, a pressure-refueling precheck switch to allow the high-level sensors to be checked from inside the aircraft, and a five-element (fuse) canister.”

21
Q

NATOPS Chap 2

Fuel System

When does fuel flow stop for HIFR?

A

Once a 20psi differential is reached.

22
Q

NATOPS Chap 2

Fuel System

What components does the left main cell have?

A

The left main cell has provisions for single-point refuel/defuel, gravity refuel, and HIFR. It also contains two high-level shutoff floats, a check valve, a sump drain, and a vent.

23
Q

NATOPS Chap 2

Fuel System

What components does the right main cell have?

A

The right cell contains two check valves, a sump drain, a vent, an APU fuel line, and a fuel dump system.

24
Q

NATOPS Chap 2

Fuel System

How does the FMCP know there is no tank mounted on one of the inboard stations

A

If an auxiliary tank gauge and low-level switch signal are absent, FMCP commands automatically bypass that tank station and go to the next occupied tank station.

25
Q

NATOPS Chap 2

Fuel System

When do the MAIN FUEL tape and readout turn yellow

A

When a main tank falls below the Low Fuel Level Sensor caution level

26
Q

NATOPS Chap 2

Fuel System

What does the master switch on the FMCP in stop flow mean?

A

Removes power from all fuel management panel switches, disables control logic and stops auxiliary fuel system control, which closes all external tank shutoff valves. The system will resume normal completion of the last operation when the master switch is returned to its prior position.

27
Q

NATOPS Chap 2

Fuel System

What happens when the fuel level in one of the fuel cells reaches 300 pounds.

A

The #1/#2 FUEL LOW caution appears and the associated digital fuel readouts on the mission and flight displays turn yellow. When total fuel reaches 600 pounds, the total fuel display also turns yellow. These cautions may illuminate and extinguish as fuel washes on and off the sensors.

In order to minimize crew desensitization when fuel washes on and off the sensors, that master caution will be displayed when a fuel low condition is detected for a period of greater than 5 seconds and deactivated when not detected for 20 seconds.

28
Q

NATOPS Chap 2

Fuel System

FMCP switches need only be set to what, to dump fuel from aux tanks?

A

TRANSFER and MANUAL OVRD if pilots desire to dump fuel from the external tanks.

29
Q

Purpose of the prime/boost pump

A
  1. Primes all fuel lines if prime is lost

2. Acts as a boost pump for APU start and operation

30
Q

Indications of water contaminated fuel

A

Fluctuations/surges in one or both engines with no associated FUEL PRESS or FUEL FLTR BYPASS caution

31
Q

Engine Fuel System Priming (from checklist)

Can you prime with one engine running?

A

No. Helicopter prime/boost pump capacity is not sufficient to prime an engine when the opposite engine is running. Engines should be primed individually with both engines off.

32
Q

EXT FUEL OVERFLOW caution

A

Fuel is sensed in the external tank vent line

33
Q

During fuel transfer, the valve and pump activated __________ with each activation of automatic fuel transfer.

A

Alternates

34
Q

At REFUEL on the FMCP, the sequencing logic does what?

A

Turns off all FMCP switches except precheck switches.

All external tank shutoff valves close until the main internal tank is filled and then open one at a time to selectively fill the external tanks.

35
Q

A malfunctioning FMCP (with electrical power applied) can cause activation of precheck valves, preventing the ability to px refuel or HIFR. What do you do to override this?

A

Pull the FUEL MGMT circuit breakers on the COPILOT cv panel to secure precheck valves to allow fueling

36
Q

Precheck switches on the FMCP

A

Each is spring loaded to the center position which provides power to the precheck valves in the main fuel tanks.

When moved to A or B, power to the respective precheck valve is interrupted, fuel flow during refueling is stopped, and fuel flow indication on the FMCP flow lights will go out.

37
Q

BITE indicator on FMCP

A

Provides fault indications when equipment performance falls below specified values and is detected by the Built-In-Test function

Black = GO
White = NO GO
38
Q

In order to minimize aircrew desensitization when fuel washes on and off the sensors, the master caution will be displayed when…

A

A fuel low condition is detected for a period greater than 5 seconds and will be deactivated when the condition is not detected for a period of 20 seconds

39
Q

When getting cold gas, fuel tanks fill in what order?

A

Any order/path of least resistance. This is an issue if your aux xfer is inop, you could end up with fuel in your aux that is dead weight on the aircraft. Getting warm gas allows the normal main-right-left refueling to take place.

40
Q

Chapter 3

Flameouts may be encountered following _____________ in excess of ___ minutes when using JP-5, JP-8, or equivalent fuels.

A

Nosedown ground operations

10

SYSTEMS (9 decks)

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