71-00-47
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 ú  C01  Page 103
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 2 (BLOCK 13)

YES
YES

15 RELUBRICATE FAN BLADE
DOVETAILS AND MIDSPAN SHROUDS
(AMM 72-31-02/401), AND DO THE
VIBRATION SURVEY
(AMM 71-00-00/501, TEST
NO. 7).

IS VIBRATION LEVEL WITHIN GUIDELINES?

NO
NO
17 DO THE TRIM BALANCE
(AMM 72-31-00/501).
CAN VIBRATION LEVELS BE

REDUCED TO ACCEPTABLE GUIDE-LINES?

High Vibration Indication
Figure 101 (Sheet 3)

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 ú  C01  Page 104
 ú  Mar 15/96 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES
BIRDSTRIKE OR FOD NONE
WITH NORMAL PARAMETERS
YES

1 LOOK IN THE ENGINE INLET
10 REPAIR THE DAMAGE OR
FOR DEBRIS OR DAMAGE TO THESE REPLACE THE COMPONENTS.
COMPONENTS (AMM 71-00-58, CLEAN THE DEBRIS FROM THE
FIG. 108):ENGINE INLET.
. INLET COWL CLEAN THE GENERATOR DRIVE
. SPINNER OIL COOLER (AMM 71-00-58,
. FAN ROTOR BLADES FIG. 116).
. 1ST-STAGE STATOR VANES CONTINUE THE ENGINE IN
. FAN OUTLET GUIDE VANES, SERVICE.

ABRADABLE SHROUD, ACOUSTIC
PANELS, OGV INNER SHROUD,
FAN DUCT PANELS, AND
SPLITTER FAIRING

.PRECOOLER FAN AIR INLET
USE A BORESCOPE TO LOOK AT THE HPC 3RD-,5TH-, AND 9TH-STAGE BLADES AND COMBUSTION CHAMBER (BIRDSTRIKE) FOR DAMAGE (AMM 72-00-00/601) IF ONE OR MORE OF THESE CONDI-TIONS APPLY:
1.  
DEBRIS APPEARS TO HAVE ENTERED GAS GENERATOR.

2.  
BIRDSTRIKE RESULTED INMISSING MATERIAL TO THE FAN BLADES.

LOOK AT THE AIRFRAME FOR DAMAGE (AMM 5-51-37/201). IS THERE DAMAGE?
NO

11 CLEAN THE DEBRIS FROM THE ENGINE INLET.
CLEAN THE GENERATOR DRIVEOIL COOLER (AMM 71-00-58,FIG. 116).
CONTINUE THE ENGINE IN SERVICE.

IF BORESCOPE INSPECTION IS NECESSARY, BORESCOPE INSPECTION MAY BE DELAYED UP TO 10 CYCLES OR 15 HOURS, PROVIDED BIRDSTRIKE DID NOT RESULT IN MISSING MATERIAL TO THE FAN BLADES, SURGE/STALL, FLAMEOUT OR FAN BLADE DAMAGE THAT IS MORE THAN THE LIMITS IN THE AREA RADIALLY INWARD OF THE MIDSPAN SHROUD. THIS SERVICE EXTENSION IS ONLY PERMITTED ON ONE ENGINE IN THE EVENT OF A MULTI-ENGINE OR ONE ENGINE FOD EVENT AND IS NOT PERMITTED ON ETOPS FLIGHTS.

2
IT IS RECOMMENDED (NOT MANDATORY) TO DO A ONE-TIME REPEAT BORESCOPE INSPECTION AT A-CHECK OR 400-800 CYCLES TO ENSURE COMPONENT INTEGRITY.
Birdstrike or FOD with Normal Parameters
Figure 102

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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 ////////////////////////
BIRDSTRIKE OR FOD PREREQUISITES WITH ABNORMAL NONE PARAMETERS OR FLAMEOUT
YES

1 LOOK IN THE ENGINE INLET 21 REPLACE THE ENGINE
AND EXHAUST AREAS FOR FOD AND/ (AMM 71-00-02/401).
OR METAL PARTICLES
(AMM 71-00-58/101, FIG. 108).

ARE SIGNS OF ENGINE
FAILURE FOUND?

NO YES
3 LOOK IN THE ENGINE INLET 15 REPAIR DAMAGE OR REPLACE
FOR DEBRIS/DAMAGE TO THESE COMPONENT AS NECESSARY.
COMPONENTS (AMM 71-00-58/101,
CONTINUE TO DO TROUBLE-FIG. 108):

SHOOTING AT BLOCK 4.
1.  
INLET COWL

2.  
SPINNER

3.  
FAN ROTOR BLADES
　
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