航空專業(yè)英語教學(xué)課件：Systems - Fuel

1、Systems - FuelWhy do we need to know about the fuel system?Fuel is essential for combustion so we should know the operation of and indications of the systemWill help us to ensure we have normal operation and troubleshoot if we have an abnormal situationObjectives Purpose of the fuel systemComponents

2、Principles of operationIndications to pilotEmergency/abnormal situationsPurpose of the fuel systemTo provide fuel to the cylinders in order to obtain combustion needed to run the powerplant and be able to flyWhat colors are the different fuels?Which one do we use?100 Low leadLook in section one of t

3、he POH for allowable fuel types and fuel capacitiesComponents Two vented fuel tanks, one in each wingThree position selector valveAuxiliary fuel pumpFuel/air control unitFuel shutoff valveFuel strainerEngine driven fuel pumpFuel manifold valveFuel injection nozzlesPrinciple of operationFuel flows by

4、 gravity from the wing tanks to a three position selector valveBoth, right, and leftGoes from the selector valve to the reservoir tankFrom the reservoir tank to the auxiliary fuel pumpFrom auxiliary fuel pump past the fuel shutoff valve and fuel strainer to the engine driven fuel pumpFuel is deliver

5、ed to the fuel/air control unitFuel is metered and distributed to each cylinderFlow rate depends on the amount of air flowing through the fuel/air control unitFuel tanksVented to prevent a vacuumTheres a line running from the right wing to the left wing attached to a wing vent behind the strutFuel c

6、aps are also ventedAlways make sure theyre forwardFuel selector valveUsed to keep fuel from spilling from one tank to the other when parked on a slopeTurn selector towards the down wingCan burn from one tank to correct for uneven filling or turning the selector to the wrong wing when parkedTakeoff a

7、nd land on bothAuxiliary fuel pumpPrimarily used for priming and reduces vapor lockIf its turned on for too long with the master switch on, mixture rich, and engine not running its possible to flood the engineCan either use the flooded engine checklist or waitVapor lock is when fuel gets heated and

8、turns from a liquid to a gas in the linesCant be sprayed into the combustion chamber like thisKeeping the fuel moving under pressure will help to prevent vapor lockAuxiliary fuel pumpNot necessary to use during normal operations since gravity and the engine driven fuel pump will supply adequate fuel

9、If the engine driven fuel pump fails using the auxiliary fuel pump will provide sufficient fuel to sustain max continuous powerFuel drainsUsed to see if there is contamination in the fuelCheck for water, particles or incorrect fuel colorAny one of those can cause engine failureFuel shut off valveSto

10、ps fuel from getting to the engineEngine driven fuel pumpThe engine driven fuel pump provides fuel under pressure from the fuel tank to the fuel/air control unitFuel manifold valve and Fuel injection nozzlesThe control unit meters fuel based on the mixture control settingSends it to the fuel manifol

11、d valve at a rate controlled by the throttleOnce at the fuel manifold valve, fuel is sent to the individual discharge nozzlesThe discharge nozzles inject the fuel/air mixture directly into each cylinder intake portIndications to pilotFuel quantity indicatorsFuel quantity is measuredby two float type

12、 sensors, one in each tankFuel quantity indicator shows the amount of fuel in each tank Make sure to visually check the amount of fuel in the tank and verify that the fuel quantity indicator is reading correctlyIndications to pilotFuel flow indicatorShows us our fuel flow in gallons per hourHelps us

13、 make sure were not running too rich or too leanEmergency/abnormal situationsEngine quitsMay have been flying the entire time drawing fuel from only one tank and now its emptyEngine troubleshoot checklist haves you turn the fuel selector to both to solve the problem if this is the caseMay have been

14、flying with the mixture too leanTroubleshoot checklist also has you enrichen the mixtureEmergency/abnormal situationsENGINE FAILUREAirspeed68 KIASFuel Shut Off ValveON (Push Full In)Fuel Selector ValveBOTHAuxiliary Fuel Pump.ONMixture.RICHIgnition SwitchBOTHEmergency/abnormal situationsLow fuel indi

15、cationIf youre in the traffic pattern, give a low fuel advisory or declare an emergency and landIf youre in the practice area and its safer to land than trying to come back just landIf youre at unusable fuel, landEmergency/abnormal situationsEngine fireIf you take away fuel or air you cant have a fi

16、reNo way to take away air and if the fire is already blazing you can take away the spark and it still burnsTake away the fuelPull out fuel cutoff valveEmergency/abnormal situationsENGINE FIRE IN FLIGHTMixture.IDLE CUT-OFFFuel Shutoff ValveOFF (Pull full out)Auxiliary Fuel Pump SwitchOFFMaster Switch

17、.OFFCabin Air Heat and AirOFF, except overhead ventsAirspeed.100 KIAS(If fire is not extinguished, increase glide speed)PROCEED WITH FORCED LANDING w/o POWERReview What is the purpose of the fuel system?To deliver fuel to the cylinders for combustionWhat colors are the different fuels?Review Why are our tanks vented?To prevent a vacuumReview What indications of the fu