1、Fuel SystemRecurrent Ground School 9/30/2005Maximum permissible fuel imbalance800 lbs between wing tanksTakeoff in excess of _ in center tank is not permissible unless _.500 lbs unless the wing tanks are above 4400 lbsMinimum fuel for go-around450 lbs per wing (max 10 degrees pitch up)LimitationsTak

2、eoff with the engine fuel temperature below _ C is prohibited.5C_ and _ crossflow must be off for takeoff. Powered and Gravity LimitationsFuelingPressure RefuelingSingle Point fuelingGravity RefuelingThrough wing portsEICAS Fuel information located on these pages:PrimaryStatusFuel SynopticOverview0.

3、60.645045054546969FF (PPH)OIL TEMPOIL PRESSFANVIBN2ITTN126.763.544826.744863.5DNDNDNGEARFUELFLAPS 8QTY (LBS)FUELTOTAL3000600030000BULK FUEL TEMPRUDDERNDNRNLRWDLWD6.2NUFLT NO. CRJ 200-TRIM-STABAILOXY 1850 RATE 0 P 0.0 LDG ELEV 560 C TEMP 20 c C ALT 0 BRAKE TEMP 01010101100450APURPMEGTL FUEL PUMP ONFU

4、EL CH 1 FAILFUELTOTAL FUEL10000 LBSFUEL USED3900 LBS1000 LBSP55 cAPU55 c4500 LBS4500 LBS-25 cPPFuel distributed to the engines and APUFuel System ComputerMonitors and controls operations of the fuel systemCalculates fuel quantity Control operations of valves and pumpsComponents and Operations FUELTO

5、TAL FUEL10000 LBSFUEL USED3900 LBS1000 LBSP55 cAPU55 c4500 LBS4500 LBS-25 cPPFuel is distributed though a combination of motive flow and gravity Scavenge EjectorsTransfer fuel from the wing to collector tanksMain EjectorsDeliver fuel from the collector tank to the engineTransfer EjectorsTransfer fue

6、l from the center to wing tanksEngines must be running for fuel transfer to take placeComponents and OperationsMotive flow is fuel circulating through the systemCreated by return fuel from the Engine Driven Fuel PumpMotive flow must be present for the ejector pumps to workEjectors are simply venturi

7、s that send pressurized fuel forward.Motive FlowMotive FlowFuel enters the back of the pump as motive flowMotive flow created by the engine driven fuel pumpsThe venturi created within the pump sucks fuel from the fuel tank belowPressurized fuel is then sent forward and is highly pressurizedDescripti

8、onFuel transfer system moves fuel from the center to the wing tanks for CG control Fuel is only carried in the center tank for extended rangesProcess is entirely automatedWill occur when the wing tank drops to 94% of total capacity (4400 lbs)No EICAS messages when fuel is transferredFuel TransferCom

9、ponents and OperationsFUELTOTAL FUEL10000 LBSFUEL USED3900 LBS1000 LBSP55 cAPU55 c4500 LBS4500 LBS-25 cPPTRANSFER EJECTORSSCAVENGER EJECTORSMAIN EJECTORSCollector tanksLocated forward section of main tanksAll fuel to the engine passes through hereTheir purpose is to make sure that the engines have a

10、 constant fuel supplyFuel enters the collector tanks primarily via gravity tanksThe scavenge ejectors pick up fuel from the lowest part of the wing tanksComponents and OperationsFUELTOTAL FUEL10000 LBSFUEL USED3900 LBS1000 LBSP55 cAPU55 c4500 LBS4500 LBS-25 cPPFUELTOTAL FUEL10000 LBSFUEL USED3900 LB

11、S1000 LBSP55 cAPU55 c4500 LBS4500 LBS-25 cPPEngine Fuel SOVLocated in main landing gear bayControlled by ENG FIRE PUSH buttonElectrically operatedAPU Fuel SOVLocated on center wing box in main landing gear bayAPU FIRE PUSH / PWR FUELElectronically operatedComponents and OperationsFUELTOTAL FUEL10000

12、 LBSFUEL USED3900 LBS1000 LBSP55 cAPU55 c4500 LBS4500 LBS-25 cPPBoost PumpsElectric pumps to move fuel from collector tanks to the enginesBackup main ejectors during start or if ejectors failWhen selected, the pumps are armed to detect a low pressure condition on their respective side ONLY!If either

13、 boost pump detects low pressure on their side, BOTH fuel pumps will turn onComponents and OperationsFUELTOTAL FUEL10000 LBSFUEL USED3900 LBS1000 LBSP55 cAPU55 c4500 LBS4500 LBS-25 cPPXFLOW/APU PUMPSystem crossflow and APU FuelFuel taken equally from both wing tanksLocated in aft bulkhead on main la

14、nding gear bayComponents and OperationsFUELTOTAL FUEL10000 LBSFUEL USED3900 LBS1000 LBSP55 cAPU55 c4500 LBS4500 LBS-25 cPPFuel XFLOW ValvesAllow fuel to be transferred between wing tanksManual or automaticGravity XFLOW ValvesAllows fuel to be transferred between wing tanks Manual onlyComponents and

15、OperationsFUELTOTAL FUEL10000 LBSFUEL USED3900 LBS1000 LBSP55 cAPU55 c4500 LBS4500 LBS-25 cPPAutomatic Fuel TransferFuel transfer will begin when there is a 200 lb. differenceFuel transfer will end when the original low tanks is 50 lbs. above the other tankGravity Fuel TransferUsed when powered XFLO

16、W fails.Pressing the switch opens the gravity manifold SOVComponents and OperationsAutomatic Powered CrossflowWhen a fuel imbalance of more than 200 pounds exists between wing tanksFSC starts XFLOW pumpFuel is taken from both wing tanksAssociated XFLOW valve opens to replenish quantityWhen low tank

17、is 50 lbs more than other tankPump stops Valve closesFuel CrossflowFUELTOTAL FUEL10000 LBSFUEL USED3900 LBS1000 LBSP55 cAPU55 c4500 LBS4500 LBS-25 cPPFuel Heat ExchangerOn engineFuel/Engine Oil Heat exchanger warms the fuel, cools the engine oilFuel temperature shows on EICASFuel FilterOn engineImpe

18、nding bypass switch, if clogged, sends EICAS messageComponents and OperationsFuel synoptic Total Fuel Quantity ReadoutFuel Used readoutCenter Tank Fuel QuantityBulk Fuel TemperatureWing tank Fuel Quantity Components and OperationsFUELTOTAL FUEL10000 LBSFUEL USED3900 LBS1000 LBSP55 cAPU55 c4500 LBS45

19、00 LBS-25 cPPComponents and OperationsAPU Negative-Gravity Relief ValveAllows fuel from right engine manifold to APUSpring loaded to open when low pressure exists downstream of the valve.Not depicted on synoptic pageWill open after XFLOW/APU pump failure or negative gravity in flightPXflow/APUPumpRi

20、ght EngineFuel FeedManifoldAPU NegativeGravity Relief ValveAPU FuelFeed ShutoffValveAPU FuelFeed CheckValveHow many fuel tanks does the CRJ have?5 two wing tanks, two collector tanks and a center tankHow are the fuel tanks vented?NACA ScoopsWhat components of the fuel system maintains symmetry (crossflow operations) of the wing tanks?APU XFLOW pump, fuel X FLOW valves and Gravity X FLOW valvesWhat electrical system is required for pressure fueling?DC powerReviewWhat ejectors supply fuel from the center tank to the wing tanks?Transfer