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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
IS NOT BALANCED CENTER OF THE LOCATION THAT THE BALANCE WEIGHT IS PUT AT THE 
987654321 SCREW TYPE  QUANTITY SCREW  WEIGHT CORRECT BALANCE 
GM-CM  GM-INCH 
P05 P06P05P05P06  5  1809  712 
P05 P06P06P06P06  5  1925  758
P06 P06P06P06P06  5  1984  781
P05 P04P04 P04P05P05P04  7  2098  826
P05 P03P03 P06P05P05P06  7  2202  867
P05 P05P05 P05P05P05P05  7  2311  910
P05 P06P06 P05P05P05P05  7  2413  950
P06 P04P04 P06P06P06P06  7  2494  982
P06 P05P05 P06P06P06P06  7  2598  1023
P06 P06P06 P06P06P06P06  7  2700  1063 
P06 P05P05 P06P06 P04P04P04P04  9  2797  1101 
P06 P06P06 P02P02 P06P06P06P06  9  2896  1140 
P06 P06P06 P06P06 P03P06P06P03  9  3007  1184 
P02 P06P06 P06P06 P06P06P06P06  9  3089  1216 
P04 P06P06 P06P06 P06P06P06P06  9  3226  1270 
P05 P06P06 P06P06 P06P06P06P06  9  3287  1294 

S-M56-MM-1264-(1)-00-B
Fan Rotor Blade Balance Screw Selection
Figure 406

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 72-31-02
 ALL  ú
 ú  C01  Page 410
 ú  Jul 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////
VIBS.
SURVEY
WITHIN LIMITS
?

NO

YES
CUSTOMER CONVENIENCE
OR IF RESULTANT IMBALANCE
IS GREATER THAN 157.5 g-inch.
(400 g.cm).

 

DIFFERENCE DIFFERENCE OF MOMENT WEIGHTS OF MOMENT WEIGHTS
NO
YES BETWEEN THE NEW FAN BETWEEN THE NEW FAN

BLADE AND ITS OPPOSITE BLADE AND ITS OPPOSITE
.50 g-inch >50 g-inch
(.127 g-cm) (>127 g-cm)

OR

STATIC CORRECTION
NOTE AND RECORD
RESIDUAL UNBALANCE OF FAN BEFORE FAN BLADE

CHANGES = A BALANCE SCREW CONFIGURATION OF FAN BEFORE FAN BLADE CHANGES = B RESIDUAL UNBALANCE OF NEW FAN ROTOR WITH

NEW FAN BLADES = C
COMPUTE AND INSTALL THE FOLLOWING
(A + B - C) = D

 

 

D = BALANCE SCREW CONFIGURATION
D = NEW STATIC CORRECTION
Replacement of Individual Fan Blades
Figure 407

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 72-31-02
 ALL  ú
 ú  C01  Page 411
 ú  Nov 15/97 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E03339
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////

S-M56-MM-0963-(1)-03-8Static Imbalance Correction Example (Individual Fan Blade Replacement) Figure 408
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 72-31-02
 ALL  ú
 ú  C01  Page 412
 ú  Jul 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 ////////////////////////
(d)  
Lift the blade retainer out of the fan disk.

 (e)  
Lower the blade to the disk center to disengage the mid-span
 shroud.

 (f)  
Move the blade forward and out of the dovetail slot to remove the blade.

 CAUTION: MAKE SURE THAT THESE MARKS SHOW ON THE HUB OF THE FAN
_______ DISK: "SHIMS REQUIRED" AND "DISK REPAIRED". DAMAGE CAN OCCUR IF YOU DO NOT FOLLOW CORRECT PROCEDURES FOR ENGINES POST-CFMI-SB 72-621.
 (g)  
ENGINES WITH A REBROACHED FAN DISK;
　
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