B-17 Pilots Manual.pdf

IglepplybyIlherareivenI theforliven19ht.thertedtionsterlsed-offtrol~achiate'ed.c. PRIMER. - The cylinder head primer has positiOitScorresponding to each of the four engines, andan "OFF" position in which the primer handle islocked. To operate, push the handle down, turn thevalve to the engine position required, and then withdrawthe handle and pump the charge to the engine.IMPORTANTPressure from No.3 fuel booster pump is onthe suction side of the primer and overprimingwill result, if the handle is left in the withdrawnposition. Therefore, each priming operationmust terminate with the handle returned to thelocked position.Q. FUEL TRANSFER SYSTEM.(1) Fuel is transferred by means of an electricmotor-driven pump and two selector valves. Themotor switch and selector valve handles are in therear of the control cabin below the door leading to thebomb bay. Direct transfer can only be made acrossthe center line of the airplane. (See figure 8 for fueltransfer procedure.)WARNINGDo not use bomb bay valve position when bombbay tanks are not installed. It is recommendedthat a 6-inch length of hose, plugged at theouter end, be attached to tne bomb bay valveports.(2) An emergency hand-operated fuel pump,mounted on the rear bulkhead of the bomb bay, can besubstituted for the electric-driven transfer pump bydisconnecting the electric pump lines from the fueltransfer selector valves at the forward end of thebomb bay and connecting the hand pump lines. Thehand pump can also be used as a refueling pump.(See figure 60.)(3) Airplanes equipped with auxiliary wing fuelcells have shut-off valves in the iines leading fromeach group of cells. These valves are controlled byhandles in the radio compartment or in the bomb baynear bulkhead No.5. (See figure 59.) Keep auxiliarycell shut-off valves "CLOSED" (handles out) at alltimes except when transferring fuel from auxiliary tomain tanks. Transfer fuel onlvwhen fuel level of maintanks has dropped to 100 I{allons per enl{ine. Aftertransfer, return valve to "CLOSED " (handle out)position.DESIREDTRANSFERFLOWPATTERNLEFT HAND TO RIGHT HAND TAN'EXAMPLEHAND BOMB FROM LEFT BAYTO ENGINE NO.' TANKLEFT HAND TO LEFT HAND TANK( TWO TRANSFERS REOUIRED)~~0-~EXAMPLE.FROM LEFT HAND BOMB BA'TO ENGINE NO. I TAN' BYWAY OF RIGHT HAND BOMB BAYTANK I::;:;;RIGHT HAND TO LEFT HANO TAN'EXAMPLE.RIGHT HAND BOMB FROM BAYTO 'NGINE NO 2 TANKRIGHT HANO TORIGHT HAHO TANK'TWO TRANSFERS REOUIRED 1~FROM ENGINE NO 3 TOENGIN' NO.' TANK BY WA