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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 3 (BLOCK 21)
High Oil Consumption/Low or No Oil Quantity
Figure 101 (Sheet 4)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES HIGH OIL QUANTITY NONE
YESYES
1 OPEN THE OIL TANK FILLER
11 DO THESE DRAIN PADS HAVE CAP (AMM 12-13-11/301). CAPS?
CAN YOU SMELL FUEL IN THE . HYDRAULIC PUMP PAD OIL?. FUEL PUMP PAD
NO NO
20A REPLACE THE MAIN OIL/FUEL
HEAT EXCHANGER AND SERVO FUEL
HEATER (AMM 79-21-02/401).
FLUSH THE ENGINE OIL SYSTEM (AMM 12-13-11/301).
YES
2 ADD OIL TO THE OIL TANK
TO DO A CHECK OF THE OIL
QUANTITY (AMM 12-13-11/301).
MAKE A RECORD OF THE QUANTITY ADDED.
DOES THE ADDED QUANTITY SHOW THAT THE OIL QUANTITY ISTOO HIGH?
21 THE OIL TANK HAD TOO MUCH OIL.
DRAIN THE OIL UNTIL THE QUANTITY IS CORRECT.
THE OIL QUANTITY INDICATING
SYSTEM (AMM 71-00-55,
FIG. 102, BLOCK 3).
High Oil Quantity
Figure 102
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
LOW OR NO OIL PRESSURE
PREREQUISITES
ENGINE OPERATION
31 DO THE TROUBLESHOOTING FOR HIGH OIL CONSUMPTION/LOW OR NO OIL QUANTITY (FIG. 101).
32 DO THE TROUBLESHOOTING FOR HIGH OIL QUANTITY (FIG. 102).
IS THE FLAME ARRESTOR CLOGGED?
NO
YES2 OPEN THE OIL TANK ACCESS DOOR.
LOOK AT THE OIL QUANTITY THROUGH THE SIGHT GLASS ON THEOIL TANK.
IS THE OIL QUANTITY LOW?
NO
YES
NO
YES
4 OPEN THE FAN COWL PANELS
(AMM 71-11-02/201).
EXAMINE THE OIL SUPPLYTUBES (AMM 71-00-58/101, FIG. 102) AND THE TUBES TO THE OIL PRESSURE TRANSMITTER (AMM 71-00-58/101, FIG. 114).
IS THERE A COLLAPSED TUBE?
NO
YES
5 LOOK AT THE MAGNETIC CHIP
DETECTORS (MCD)(AMM 79-00-00/
601).
IS THERE UNUSUAL CONTAMI-NATION?
NO
YES
6 DRAIN OIL TANK
(AMM 12-13-11/301). INSPECT
OIL TANK SCREEN SUCTION TUBE
USING A FIBERSCOPE THRU OIL
TANK DRAIN PLUG PORT.
IS THE SCREEN CLOGGED?
NO
SEE SHEET 2 (BLOCK 7)
34 REPLACE THE ENGINE (AMM 71-00-02/401).
35 DO THE OIL TANK SCREEN SUCTION TUBE CLEANING (AMM 79-11-01/401). CONTINUE THE ENGINE IN SERVICE.
Low or No Oil Pressure
Figure 103 (Sheet 1)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1
(BLOCK 6)
NO
YESYES
7 RESERVICE OIL TANK
25 REPLACE THE LUBRICATION
(AMM 12-13-11/301). UNIT (AMM 79-21-01/401).
REMOVE THE LUBRICATION CLOSE THE FAN COWL PANELS
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