Fuel Flashcards
Total capacity of the fuel system
gallons and pounds
130 total gallons/127.8 usable gallons
869 total pounds
How many fuel tanks do we have and what type are they?
2 crash-resistant, bladder type fuel cells
What is the capacity of the forward fuel cell?
37.6 gallons usable
256 pounds
What is the capacity of the main fuel cell?
90.2 gallons usable
626 pounds
How are the fuel cells connected?
1 gravity line
1 pressure transfer line
Describe the fuel transfer pumps
2 electrically operated fuel transfer pumps
Mounted on the sump plate of the forward cell
Describe the fuel boost pumps
2 electrically operated fuel boost pumps
Mounted on the sump plate of the main cell
Describe the drain valves
2 electrically operated fuel drain solenoid valves
Mounted on the sump plate of the forward and main cell, 1 each
1 Airframe Fuel Filter drain, must have boost pumps and fuel valve on to have fuel flow to that filter sump
Describe the fuel shutoff valve
1 electrically operated fuel shutoff valve
Located above the main cell
Describe the fuel quantity indicating system
3 fuel quantity probes: 1 in forward cell, 2 in main cell
Describe the low fuel detection system
Activates CAS message: LOW FUEL when fuel reaches:
100 +/- 10 pounds for 13 +/- 3 seconds continuous
Mounted on the main cell sump plate
Describe the Airframe Fuel Filter
Airframe mounted fuel filter on right side
Has a CAS message light test button
Activates CAS message: Fuel Filter when the filter is in impending bypass
Must be cleaned prior to next flight
Describe the Engine Mounted Fuel Filter
Engine mounted, CEFA fuel filter, on left side of engine
Outboard portion being the fuel filter portion
LRB extends at pressure differential of 2.5 +/- 0.5 PSID
Filter bypasses at 3.4 PSID
Generally, describe the 4 fuel system components that come after the Airframe Fuel filter.
- CEFA: filters fuel on the outboard portion of the filter assembly prior to entering the HMU
- ECU: part of the FADEC system, monitors engine power demands and signals HMU metering valve to provide proper amount of fuel to combustion chamber
- HMU: a fuel pump provides high pressure fuel to the fuel control assembly that sends the correct amount to the combustion chamber, as directed by the ECU
- Fuel Nozzle: atomizes and injects fuel to combustion liner at proper spray angle to support combustion
Fuel system amount, in pounds, at which the system is at full capacity
869 pounds
Fuel system amount, in pounds at which transfer from the forward to the main cell begins.
770 pounds
What occurs when the fuel system reaches 770.0 pounds total?
Transfer from forward to main cell begins
Fuel is continued to be drawn from main cell
CG moves forward during this portion of fuel burn.
Fuel system amount, in pounds, at which fuel is consumed equally from the forward and main cell.
508.6 pounds
What occurs when the fuel system reaches 508.6 pounds total?
Fuel is consumed equally from both the forward and main cell
CG is at its most forward point during fuel burn
Fuel system amount, in pounds, at which fuel is consumed from the forward cell until it is depleted
344.1 pounds
What occurs when the fuel system reaches 344.1 pounds total?
Fuel is consumed from the forward cell until the forward cell is depleted
CG moves aft during this portion of fuel burn.
Fuel system amount, in pounds, at which the forward cell is empty.
193.1 pounds
What occurs when the fuel system reaches 193.1 pounds total?
The forward fuel cell is empty
CG is at its most aft position during fuel burn
Fuel system amount, in pounds, at which the Low Fuel CAS is displayed
100 +/- 10 pounds
What occurs when the fuel system reaches 100 +/- 10 pounds total?
If held for 13 +/- 3 seconds continuously, the Low Fuel CAS will display
CG will shift forward during this stage of fuel burn
What is the procedure if both transfer pumps fail?
- Hold down the Forward Fuel Quantity Button until Forward Fuel Quantity is displayed.
- Subtract that amount, or 151.0 pounds, whichever is less, from the total
- Plan landing accordingly
Fuel pressure range
8-25 PSI
