(a) Full First-Stage Fan Disk: 1) Cracks are not serviceable. 2) There is no limit on the quantity of nicks and scratches
(except in Areas W,X,Y and Z, dovetail slots, bolt holes
and mating faces) as follows:
a) The damage is less than 0.003 inch (0.075 mm) in depth.
b) A 100 cycle maximum service extension is permitted if
the damage is not more than 0.008 inch (0.20 mm) in depth.
3) Nicks, dents and scratches in the Areas W,X,Y and Z are not serviceable. If more than 0.0008 inches (0.02 millimeters) in depth.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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(b) Dovetail Slot Pressure Faces.
NOTE: CFMI tool 856A6629 is for use on only engines with a
____ non-rebroached fan disk (production). It is not necessary to use a tool on an engine with a rebroached fan disk to do an inspection of the pressure faces.
NOTE: Rebroached fan disks are identified by a white line
____ of paint that circles the fan disk, along with the words SHIMS REQUIRED in white letters on one side of the disk. On the opposite side of the disk are the words DISK REPAIRED, also in white letters. (Reference CFMI Service Bulletins 72-621 and 72-820 for more information.)
1) ENGINES WITH A NON-REBROACHED FAN DISK; (ENGINES PRE-CFMI-SB 72-621 AND PRE-CFMI-SB 72-820); Do an inspection of each pressure face. Damage is permitted if it is in the limits that follow: a) A worn, fretted surface that is less than 50% of Area A
is permitted.
b) If you find a worn, fretted surface that is equal to or more than 50% of Area A, then you must do a wear depth measurement on all dovetail slots.
1.
Wear depth measurement less than 0.005 inch (0.13
_ mm) in depth, the fan disk is serviceable.
2.
Wear depth measurement equal to or more than 0.005
_ (0.13 mm) in depth, the fan disk is not serviceable.
3. To regain serviceability of the fan disk, refer to
_
CFMI SB 72-854.
2) ENGINES WITH A REBROACHED FAN DISK; (ENGINES POST-CFMI-SB 72-621 AND POST-CFMI-SB 72-820); Do a visual inspection of each pressure faces, and obey the limits that follow: a) A worn, fretted surface that is less than 50% of Area A
is permitted.
b) If you find a worn, fretted surface that is equal to or more than 50% of Area A, then the fan disk is not serviceable.
3) There is no limit to the quantity of nicks, dents and scratches in Area A, if the damage is in the limits that follow: a) Damage less than 0.003 inch (0.075 mm) in depth is
permitted. b) A 100 cycle service extension is permitted if the damage is less than 0.008 inch (0.20 mm) in depth.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
72-31-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
4) There is no limit to the quantity of nicks, dents and scratches in area D, if the damage is in the limits that follow: a) ENGINES WITH A NON-REBROACHED FAN DISK;
(ENGINES PRE-CFMI-SB 72-621 AND PRE-CFMI-SB 72-820); Damage less than 0.0008 inch (0.02 mm) in depth is permitted.
b) ENGINES WITH A REBROACHED FAN DISK; (ENGINES POST-CFMI-SB 72-621 AND POST-CFMI-SB 72-820); Damage less than 0.003 inch (0.075 mm) in depth is permitted.
5) Nicks, dents, and scratches in Area B are serviceable if less than 0.0008 inch (0.02 mm) in depth. 6) Nicks, dents and scratches in area C are servicable if less than 0.01 inch (0.25 mm) in depth. 7) Nicks, dents, and scratches in the forward and aft radius are not serviceable. 8) Fretting in the forward flange is not serviceable.
S 226-025-C00
(10) Examine the forward flange of the booster spool as follows
(Fig. 605): ú (a) Wear in Area E: ú 1) The maximum permitted wear depth is 0.001 inch
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