3. IF YOU FIND BRONZE PARTICLES IN THE SCREEN, DO A FUEL FILTER CARTRIDGE INSPECTION (AMM 73-11-02/601).
SEE  A
FUEL
PUMP
LUBE FLOW SCREEN
FUEL
FILTER
A
Fuel Pump Impeller Rotation Check Figure 102
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FUEL FILTER CHECK
1.
 REMOVE FUEL FILTER CARTRIDGE (73-11-02).

2.
 GENTLY FOLD BACK TO EXPOSE CONTAMINANTS ON THE PLEATS AREA OF CARTRIDGE AREA AND .  MOVE PLEATS ASIDE TO EXPOSE AREA BETWEEN PLEATS.

3.
 REFER TO CONTAMINANT IDENTIFICATION CHART FOR CORRECTIVE ACTION (SHEET 2).

SEE A
CONTAMINATION
FUEL FILTER COVER
DRAIN PLUG
FUEL FILTER DIFFERENTIAL PRESSURE SWITCH
FWD
A

Fuel Filter Check
Figure 103 (Sheet 1)

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FUEL FILTER CHECK CONTAMINATION IDENTIFICATION AND CORRECTIVE ACTION
NONE CONTAMINANT  NORMAL CAUSE  NONE - INSTALL A NEW FUEL FILTER CARTRIDGE (AMM 73-11-02/401). CORRECTIVE ACTION
_____ OR DEBRIS SAND, ALUMINUM, OF SOLIDS, DIRT, SMALL AMOUNT VISIBLE  NORMAL  NONE - INSTALL THE NEW FUEL FILTER CARTRIDGE (AMM 73-11-02/401). 
_____ DEPRIS WITH SAND, ALUMINUM, OR OF SOLIDS, DIRT, SMALL AMOUNT VISIBLE FUEL FILTER BYPASS LIGHT ON ____  NORMAL  NONE - INSTALL A NEW FUEL FILTER CARTRIDGE (AMM 73-11-02/401). 
_____ WITHOUT ALUMINUM, OR DEBRIS SAND, METALLIC, OF SOLIDS, DIRT, LARGE AMOUNT VISIBLE BYPASS LIGHT ON _______ FUEL FILTER  DAMAGED BOOST PUMPS FOREIGN MATERIALS, DIRTY FUEL,  FLUSH THE FUEL LINES (AMM 28-22-00/701). CLEAN THE TANKS IF IT IS NECESSARY (AMM 28-11-00/701). DO A CHECK ON THE TANKS. 3. FUEL FILTER CARTRIDGE(S) (AMM 73-11-02/401). AFTER 24 HOURS IN SERVICE, DO A CHECK AND REPLACE THE 2. REMOVE ALL ACCESS PANELS (AMM 28-11-11/401). PURGE THE FUEL TANKS (AMM 28-10-00/201). 1. DO A CHECK OF THE FUEL FILTER ON THE OPPOSITE ENGINE. 
_____ WITH FUEL FILTER METALLIC, OR DEBRIS SAND, ALUMINUM, OF SOLIDS, DIRT, LARGE AMOUNT VISIBLE BYPASS LIGHT ON ____  DAMAGED BOOST PUMPS FOREIGN MATERIALS, DIRTY FUEL,  A) REPLACE THE FUEL NOZZLES AND THE FUEL B) MANIFOLDS (AMM 73-11-04/401). FLUSH THE FUEL LINES (AMM 28-22-00/701). LIMITS, DO THE STEPS THAT FOLLOW: IF THE SUBSEQUENT RESULTS ARE IN THE SERVICEABLE LIMITS, DO THE STEP THAT FOLLOWS, STEP NUMBER 5: LIMITS, REPLACE THE ENGINE. FUEL FILTER CARTRIDGE(S). PURGE THE FUEL TANKS (AMM 28-10-00/201). REMOVE ALL ACCESS PANELS (AMM 28-11-11/401). IF THE BORESCOPE RESULTS ARE IN THE SERVICEABLE DO A CHECK ON THE TANKS. FLUSH THE FUEL LINES (AMM 28-22-00/701). REPEAT THE BORESCOPE INSPECTION AFTER 100 HOURS. IF THE SUBSEQUENT BORESCOPE RESULTS DO NOT SHOW A DO A CHECK OF THE FUEL FILTER ON THE OPPOSITE ENGINE. AFTER 24 HOURS IN-SERVICE, DO A CHECK AND REPLACE THE DO A BORESCOPE INSPECTION OF THE COMBUSTION CHAMBER, HPT NOZZLE, AND STAGE 1 LPT NOZZLE (AMM 72-00-00/601). IF THE BORESCOPE RESULTS ARE OUT OF THE SERVICEABLE CLEAN THE TANKS IF IT IS NECESSARY (AMM 28-11-00/701). CHANGE COMPARED TO THE FIRST BORESCOPE INSPECTION, ENGINES PRE-CFMI-SB 73-134; 3. 1. 2. 4. 5. A. B. A. THEN RELEASE THE ENGINE. SERVICEABLE LIMITS, REPLACE THE ENGINE. IF THE SUBSEQUENT RESULTS ARE OUT OF THE COMPARED TO THE FIRST BORESCOPE INSPECTION: B. IF THE SUBSEQUENT BORESCOPE RESULTS DO SHOW A CHANGE 1) 2) 

Fuel Filter Check
Figure 103 (Sheet 2)

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