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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
| BRONZE PARTICLES IN | FUEL PUMP | ENGINES PRE-CFMI-SB 73-134; | | LARGE QUANTITIES | | 1. DO A BORESCOPE INSPECTION OF | | | | THE 1ST AND 2ND STAGE LPT | | | | NOZZLE GUIDE VANES | | | | (AMM 72-00-00/601). | | | | A. IF THE BORESCOPE RESULTS ARE | | | | OUT OF THE SERVICEABLE LIMITS,| | | | THEN REPLACE THE ENGINE. | | | | A. IF THE BORESCOPE RESULTS ARE | | | | IN THE SERVICEABLE LIMITS, | | | | DO THE STEPS THAT FOLLOW: | | | | 1) REMOVE THE FUEL PUMP, MEC, | | | | SERVO FUEL HEATER, HEAT | | | | EXCHANGER, FUEL FLOW | | | | TRANSMITTER, AND FUEL | | | | NOZZLES. | | | | 2) FLUSH THE FUEL LINES. | | | | | | | | AIRPLANES POST-CFMI-SB 73-134; | | | | 1. REPLACE THE FUEL NOZZLE FILTER. | | | | 2. REMOVE THE FUEL PUMP, MEC, SERVO| | | | FUEL HEATER, HEAT EXCHANGER, | | | | IDG OIL COOLER, AND FUEL FLOW | | | | TRANSMITTER. | | | | 3. FLUSH THE FUEL LINES. | 2.....................…...................…....................................1
 TASK 73-11-02-706-014-C00
 3. Fuel Filter Cover Attachments Inspection
________________________________________
 A. General
 (1)  The fuel filter cover and its attachments for the CFM56-3 series engines have 4 possible configurations.
 (a)  
Configuration One - Initial release, engines Pre-CFMI-SB 73-125 and Pre-CFMI-SB 73-A129.

 (b)  
Configurations Two and Three - Subsequent release, engines Post-CFMI-SB 73-125 and Pre-CFMI-SB 73-A125.

 NOTE: CFMI SB 73-125 introduced the self-aligning nut and
____ washer modification to the fuel filter cover design.
 NOTE: Configurations Two and Three appear visually to be
____ the same, but in fact are different in design. The hardware for Configurations Two and Three is not interchangeable, and should not be mixed.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(c)  Configuration Four - Latest release, engines Post-CFMI-SB 73-125 and Post-CFMI-SB 73-A129.
 NOTE: CFMI SB 73-A129 introduced the D-head bolt modification
____
 to the fuel filter cover.

 B.  Procedure
 S 026-008-C00
 (1)  
Open the left fan cowl panel (AMM 71-11-02/201).

 S 416-007-C00

 (2)  
Remove the fuel filter (AMM 73-11-02/401).

 S 716-013-C00

 (3)  
ENGINES PRE-CFMI-SB 73-125 AND PRE-CFMI-SB 73-A129;
 (CONFIGURATION ONE);
 Do an inspection of the fuel filter parts assembly.

 (a)  
Examine the bolt (40) threads and the washers (30) for evidence of nicks or dents. If damage is present, discard the bolt or washer.

 (b)  
Examine the main fuel pump housing insert for evidence of damage, such as a pulled-out insert, insert movement, or damaged insert threads.

 

 NOTE: The original depth of the helicoil insert when
____ installed is from 0.010 inch (0.25 mm) to 0.054 inch
 (1.37 mm), or a quarter to one-and-a-half thread pitch below the parting surface of the fuel pump housing.
 1)  If the insert is pulled out, loose, or the insert thread is damaged, then do one of the following procedures to correct the problem: a) Repair the insert (AMM 73-11-02/801). b) Replace the main fuel pump (AMM 73-11-01/401).
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 ALL  ú ú C01 Page 609 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
c)  Remove the pump and have it changed to the Post-CFMI-SB 73-A129 configuration.
 S 716-012-C00
 (4)  ENGINES POST-CFMI-SB 73-125 AND PRE-CFMI-SB 73-A129; (CONFIGURATION TWO); Do an inspection of the fuel filter parts assembly.
 (a)  Inspect the bolts (100), self aligning nuts (120), washer (130) and self aligning washers (130) for evidence of nicks or dents damage to the threads or spherical face. If present, discard the part.
　
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