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P6 CIRCUIT BREAKER P5-2 FUEL SYSTEM PANEL M528 ENGINE ACCESSORY UNIT (E3-2)PANEL
FUEL SCAVENGE
THE SCAVENGE FUEL VALVE REMAINS OPEN FOR20 MINUTES AFTER S8 AND S9 ARE TURNED OFF
NOT ON ALL AIRPLANES
NOT ON AIRPLANES WITH FUELSCAVENGE FLOW INDICATOR/CHECK VALVE
Center Tank Fuel Scavenge System Schematic
Figure 2
A 737-300/400/500MAINTENANCE MANUAL
A
737-300/400/500MAINTENANCE MANUAL
B. When you open the fuel scavenge shutoff valve it lets the fuel boost pumps for the No. 1 tank move fuel through the fuel scavenge jet pump. The fuel scavenge jet pump causes a low pressure in the fuel scavenge transfer line to the center tank. On airplanes with fuel scavenge flow indicator/check valve, fuel is drained from the center tank through the fuel scavenge flow indicator/check valve into the No. 1 tank. The indicator can be monitored on the ground, to make sure that fuel is moves into the No. 1 tank. On airplanes without a fuel scavenge flow indicator/check valve, fuel is moved from the center tank through the flapper check valve into the No. 1 tank.
C. After approximately 20 minutes of operation, the timer in the engine accessory unit closes the fuel scavenge shutoff valve to stop fuel scavenge.
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1.
2.
3.
A
737-300/400/500MAINTENANCE MANUAL
CENTER TANK FUEL SCAVENGE SYSTEM - TROUBLE SHOOTING
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General
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A. These trouble shooting procedures were developed with data from system functional tests. The procedures are shown in a tree-type configuration. The operational steps (heavy-line boxes) are connected by arrows to show the path through the tests that gives good (system operable) results (OK condition). When all of the steps in the condition path give good results (OK condition), the fuel scavenge system operates correctly.
B. When an operational check step does not indicate an OK response, follow the NOT OK line to the thin-line box that contains the applicable problem. Refer to the procedure shown in the thin line box. Make an analysis of the results of each test while you follow a single line from each box to the subsequent box. Continue this procedure until you find the necessary procedure to correct the problem. Do the necessary procedure to correct the problem. Then do the step where you found the problem again to make sure you corrected the problem.
C. All of the trouble shooting procedures for electrical components must be done with good wiring and electrical power available. If the procedure in the trouble shooting block does not correct the problem, do a check of the wiring continuity. Refer to the applicable diagram in the Wiring Diagram Manual (WDM).
D. The references in the fault isolation blocks refer to the applicable procedures in the 737 maintenance manual unless the reference includes the letters "WDM" which shows that the necessary data is in the 737 wiring diagram manual.
Equipment and Materials (Airplanes With Flow Indicator/Check Valve)
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A. Leading Edge Flap Actuator Locks - F80048-84Prepare for Trouble Shooting
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A. Procedure
(1) Connect the external electrical power to airplane
(Ref 24-22-00/201).
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE
_______ AND TE FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU EXTEND OR RETRACT THE FLAPS. THE FLAPS CAN MOVE QUICKLY WITH TEH HYDRAULIC POWER REMOVED. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
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A
737-300/400/500MAINTENANCE MANUAL
4. Troubleshoot Center Tank Fuel Scavenge System
NOT OK
OK With the right CTBP switch OFF and the left CTBP switch ON, make sure the fuel flow indicator/check valve needle is in the blue band. IF -
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