Fuel Flashcards
Where is the fuel stored?
Two integral wing tanks
How many pumps are found in each tank and what are they called?
Three; one ejector pump, one scavenge ejetor pump, one electric fuel boost pump
What is normally used to supply fuel from the wing to the engine fuel control unit in flight?
Ejector pumps
How is the primary fuel ejector pump powered?
Motive flow from the respective engine
What is the primary purpose of the scavenge jet pump?
Maintains the fuel level in the ocllector tank ensuring a constant flow of fuel to the engine during normal flight
When is the electric fuel pump (boost pump) activated if switch is in auto position?
Engine start, crossfeed, low fuel pressure (primary ejector pump fails)
What ensures that the differential pressure between the tank and ambient remains within structural limits and prevents fuel spillage?
Fuel vent system (including a NACA air inlet/outlet)
How is crossfeeding performed?
Select the XFEED switch to the tank with the low fuel quantity. This opens the crossfeed valve and turns on the DC boost pump in the wing tank with the higher fuel level. Both engines will then be getting fuel from the high tank.
What is the restriction on crossfeed operation?
Shall not be performed during takeoff and landing
When fuel becomes balanced and the crossfeed valve is still open, what EICAS message will be annunciated?
FUEL EQUAL
Will the total tank quantity indication be lost if only one wing tank quantity indicator fails?
Yes
The fuel shutoff valves are normally open. What is the only way to close one of these valves?
Pushing the fire shutoff button.
What owuld cause a “FUEL LO LEVEL” EICAS message?
310 lbs of fuel remaining in the respective tank
What would cause a “FUEL IMBALANCE” EICAS message?
220 lb imbalance
Is there de-fueling capability?
Yes, by means of a dump valve located under each wing
While fueling, what monitors the fuel quantity in the tanks and controls refueling flow into each tank?
Electronic Fuel Control Unit (EFCU)
How long is the maximum refueling time from empty to full?
Less than 12 min, at 50 psig
Explain the two critical tests that should be accomlished on the fueling control panel before re-fueling starts?
Lamp test - When the LAMP TEST switch is held up, the LH TANK and RH TANK indicator lights stay on or come on according to the status of these lights, the FAIL indicator turns on and the digits light up.
Shut-off test - When the SHUT-OFF TEST switch is held up during pressure refueling operation, the LH TANK and RH TANK indicator lights must coem on, indicating that the shut-off valve closes, and the FAIL indicator light must be off.
What action is necessary to accomplish on the refueling panel if external power is not being utilized?
The POWER SWITCH must be selected to BATT.
How much fuel is the 45-min IFR reserve? (LIMITATION)
1121 lbs
What is the minimum fuel for release? (LIMITATION)
1880 lbs
What is the hot spare fuel load? (LIMITATION)
3400 lbs
What is emergency fuel?
759 lbs
What is the maximum fuel that could fit into the tanks? (optimum temp/pressure)
5401 lbs
