FUEL Flashcards
What type of fuel system is described?
Crashworthy, suction-type system with self-sealing tanks and breakaway valves
What refueling methods are supported by the fuel system?
- Pressure refueling
- Gravity refueling
- Helicopter In-Flight Refueling (HIFR)
Quick Function check of the Fuel System
-Can it prime its on engines
- If i need to get light what can the system do
- Unlike my car what does this fuel tank tell me more or less
- Will I ever be surprised that Im running low
- Priming the engines
- Dumping fuel
- Indicating fuel quantity
- Warning of low fuel levels
What is the role of the prime/boost pump?
Primes all fuel lines if prime is lost and acts as a boost pump for APU start and operation
What happens if a low-pressure condition exists? ( Think Cautions)
1/#2 FUEL PRESS caution appears for the respective engine
What does the engine fuel filter bypass warning system consist of? ( Looking for 2 things, don`t over think it)
- Impending bypass Pressure Differential Indicator (PDI)
- Caution indicator
What caution appears when fuel bypasses the filter?
1/#2 FUEL FLTR BYPASS caution
Are fuel filters sensitive to water contamination?
No
What happens with the fuel selector levers in OFF position?
Selector valves are closed
What is the function of the FUEL PUMP selector switch?
Activates the prime/boost pump and allows fuel to enter all fuel lines prior to engine start
What does placing the FUEL PUMP switch to APU BOOST do?
Opens the APU fuel shutoff valve and activates the prime/boost pump
What occurs when the FUEL PUMP switch is set to FUEL PRIME?
Opens both engine prime shutoff valves for individual engine priming
What type of pump is installed in each main tank?
Electrically operated, submerged fuel boost pump
What is the purpose of the tank fuel boost pump?
Provides a positive fuel supply and a secondary means of priming the engines
What is the capacity ( Gallons) of the main fuel tanks in the fuel system?
Two 180-gallon tanks
What type of damage can the lower one-third of the main fuel tank seal?
Damage from rounds up to 14.2 mm
What type of damage can the upper two-thirds of the main fuel tank seal?
Damage from rounds up to 7.62 mm
What is the usable capacity ( Gallons) of the auxiliary fuel tanks in the Extended Range Fuel System (ERFS)?
194 gallons
How is the fuel level of the auxiliary fuel tanks monitored?
By a single gauge probe
For fuel loads of 2,400 to 3,700 pounds, which auxiliary tank should be fueled?
Only the FWD auxiliary tank
True or False: The BOTH position of the ERFS control valve is used for ground refueling operations only.
True
What does the fuel management control panel (FMCP) allow the crew to do?
Manual control of fuel transfer and dump, fuel boost pump, and precheck valve operation
What is the fuel transfer system controlled by? ( The control Panel Name )
The FMCP
What rate does fuel transfer occur at?
Approximately 350 pounds per minute
What indicates that fuel transfer is in progress?
- Green background with black text on the fuel quantity displays
- FLOW light illuminates on the FMCP
- TRANSFER IN PROGRESS appears on the MDs
- FUEL XFER appears on the aircraft graphic
What caution appears when a transfer/dump pump fails?
PUMP/VALVE FAIL caution
Fill in the blank: The fuel quantity indicating system has how many.
-Fuel signal conditioners
-Capacitance-type fuel probes,
-low-level fuel thermisters
1 / 2 / 2
What color does the digital fuel quantity display turn when the fuel quantity is 300 pounds or less in a main tank?
Yellow
What activates the FUEL LOW caution?
When the fuel level in a main tank reaches 300 ±15 pounds
How long must a fuel low condition be detected for the master caution to be displayed?
For a period greater than 5 seconds
What happens to the MD fuel quantity indications after reaching the main fuel tank high-level shutoffs?
Returns to green text on a black background
What is the function of the high-level shutoff floats in the fuel tanks?
To prevent overfilling of the main tanks
When can the fuel dump system activated?
When the helicopter has weight off wheels
The fuel dump system allows for the dumping of fuel from the main tanks.
What will the system dump down to if the system is functioning properly
down to approximately 300 pounds per side
Where are the FUEL PUMP NO. 1 and FUEL PUMP NO. 2 circuit breakers located?
On the CABIN circuit breaker panel.
Can fuel be dumped directly from the internal auxiliary fuel tank?
No
Fuel must first be transferred from the auxiliary fuel tank to the main tanks.
What is the purpose of the single-point pressure refueling system?
To pressure refuel the fuel tanks on the ground with or without electrical power.
How is the right fuel tank pressure filled during refueling?
Through an interconnect break-away valve from the left fuel tank.
What happens if refueling of the auxiliary fuel tanks is not desired?
The tank must be disconnected at the bulkhead quick disconnect or the manual precheck lever must be moved to the PRECHECK position.
What is the pressure refueling capability provided?
Standard 55-psi and closed circuit 15-psi pressure refueling capability.
What does the precheck switch do on the pressure refueling panel?
Interrupts ground pressure refueling to indicate system operation status.
What is the purpose of the HIFR system?
To facilitate in-flight refueling.
What happens when the PRECHECK switch is depressed during HIFR?
It should stop the fuel flow.
What occurs if fuel is contaminated during HIFR?
Flow is reduced to an extremely low level.
What is the role of the GO/NO-GO canister?
To detect contamination in the fuel.
Fill in the blank: The fuel dump system operates until fuel levels decrease sufficiently to allow _______ into the fuel dump lines.
air
True or False: The auxiliary fuel tank precheck lever is spring-loaded.
False
The precheck lever remains in the selected position.
What is the Fuel Signal Conditioner Job?
Bonus: Via what part does this process happen?
Fuel Levels signals from the fuel probes are converted to fuel weight signals and sent to the F/MD
Bonus: Flight management Computers
What does the low level Fuel Thermistor do for its respective tank?
When the fuel level in a main tank reaches 300 ±15 pounds, the low-level fuel thermister activates the FUEL LOW caution.
