10 REMOVE THE SCAVENGE OIL 22 INSTALL THE SCAVENGE OIL FILTER ELEMENT (AMM 79-21-04/ FILTER ELEMENT (AMM 79-21-04/ 401) AND EXAMINE THE ELEMENT.401) AND DO THIS PROCEDURE:
IS THE FILTER ELEMENT OIL FILTER BYPASS SYSTEM CONTAMINATED?PROBLEMS (AMM 71-00-55/101,FIG. 106).
YES
NO11 EXAMINE THE MAGNETIC CHIP DETECTOR FOR ABNORMAL DEBRIS(AMM 79-00-00/601).
IS THERE ABNORMAL DEBRIS?
YES

Oil Filter Bypass Warning Light Illuminated
Figure 106

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 ú  C01  Page 111
 ú  Jul 15/95 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES
OIL FILTER CLOG
NONE
INDICATED

NO
1 REMOVE SCAVENGE OIL FILTER
ELEMENT (AMM 79-21-04/401) OR
OIL SUPPLY FILTER ELEMENT
(AMM 79-21-03/401) AS
APPLICABLE AND CHECK FOR FREE
MOVEMENT OF CHECK VALVE.
DOES CHECK VALVE OPERATE
FREELY?
YES YES
3 CHECK FILTER ELEMENT FOR
SILICONE DEPOSITS INDICATING
USE OF UNAPPROVED ENGINE OIL.

IS FILTER ELEMENT CLOGGED WITH SILICONE DEPOSITS?
NO YES

5 CHECK MAGNETIC CHIP
DETECTORS FOR ABNORMAL DEBRIS
(AMM 79-00-00/601).
IS THERE ABNORMAL DEBRIS?
NO YES
14 REPLACE OIL SUPPLY FILTER 26 REPLACE LUBRICATION UNIT
ELEMENT (AMM 79-21-03/401) AND (AMM 79-21-01/401) OR SCAVENGE
SCAVENGE OIL FILTER ELEMENTOIL FILTER ASSEMBLY AS
(AMM 79-21-04/401). APPLICABLE.
CONTINUE ENGINE IN SERVICE
FOR ONE CYCLE AND CHECK
NO
CLOGGING INDICATOR
(FIM 71-00-58/101, FIG. 112).
DID CLOGGING INDICATOR
POP UP?
Oil Filter Clog Indicated
Figure 107

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 ú  Jul 12/99 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
POWER PLANT - TROUBLE SHOOTING
______________________________ (ENGINE FUEL SYSTEM)
____________________
 1.  General_______
 A. This section provides trouble shooting for engine fuel system problems.
 2.  Trouble Symptom Listing_______________________
 Trouble Symptom_______________  Begin Trouble Shooting
 FILTER BYPASS Light Illuminated Fig. 101 Block 1
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 ALL  ú ú C01 Page 101 ú Oct 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
FILTER BYPASS LIGHT PREREQUISITESILLUMINATED ELECTRICAL POWER
//////////////////////// / /
CFM56 ENGINES
/ / ////////////////////////

NO
NO

1 REMOVE AND CHECK FUEL

11 PERFORM FUEL FILTER BYPASS 21 REPLACE FUEL FILTER

FILTER ELEMENT (71-00-59, WARNING SYSTEM TEST FIG. 103). (73-34-00 A/T). IS ELEMENT CONTAMINATED? IS FUEL FILTER BYPASS WARNING SYSTEM OPERATION
YES
WITHIN LIMITS?
YES

DIFFERENTIAL PRESSURE SWITCH (73-34-01). REPEAT FUEL FILTER BYPASS WARNING SYSTEM TEST (73-34-00 A/T).
IS FUEL FILTER BYPASS WARNING SYSTEM OPERATIONWITHIN LIMITS? NO

22 CHECK AND REPAIR FUEL
FILTER BYPASS WARNING SYSTEM
CIRCUIT (WM 73-34-00).

23 REPLACE OIL/FUEL HEAT
EXCHANGER (79-21-02).

25 PERFORM CORRECTIVE ACTION (71-00-59, FIG. 103).

Filter Bypass Light Illuminated
Figure 101

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