72-33-00
 ALL  ú ú C01 Page 807 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////
TASK 72-33-00-348-103-C00
 4.  ENGINES WITH THE RTV SILICONE (BLACK COLOR) ABRADABLE SHROUD; Patch Repair of the Abradable Shroud
____________________________________
 A.  General
 (1)  This task refers to a procedure for the in-place repair of the abradable shroud by installation of a patch of 24 inches (600 mm) maximum length.
 NOTE: The following patch repair is estimated to take less than
____ 8 hours in the hangar when done by skilled mechanics familiarized with the procedure.
 B.  Equipment
 (1)  
Protective mats (two are necessary) - Rubber Manufacturer's Association, Grade SC43, Neoprene sponge, 1.0 inch thick, approximately 3.0 x 4.0 feet with warning streamer attached.

 (2)  
Scalpel - locally available.

 (3)  
Locally manufactured tooling - Pressure pad, thermally-controlled electrical supply unit and heating blanket (see Fig. C) or:

 Special tool - Pressure tool inflatable blade path liner
 -
For 220 VAC (50 Hz), 856A3630G01

 -
For 110 VAC (60 Hz), 856A3630G02

 NOTE: The heating blanket and the thermally-controlled electrical
____ supply unit may be purchased from: Watlow France, Immeuble Somag 1, Rue Ampere 95300 Pontoise - France Tel: (1) 30732425 FAX: (1) 30732875
 C.  Consumable Materials
 (1)  
Abrasive cloth - CP2239 grit size 80 to 120

 (2)  
Acetone - CP1039

 (3)  
Base RTV 147 A - CP2297

 (4)  
Catalyst (hardener) RTV 147B - CP2298

 (5)  
Primer MB - CP2340

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 72-33-00
 ALL  ú ú C02 Page 808 ú Nov 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////
(6)  
RTV 630, Part A and Part B - CP2339

 (7)  
Primer SS 4155 - CP2215

 (8)  
Heat - resistant tape 3M No. 5490 - CP2306

 (9)  
Release film - CP2505

 (10)
 Abradable liner (Ref CFMI IPC 72-23-00, Item 26-790)

 D. References
 (1)  
AMM 72-31-02/401, Fan Rotor Blades

 (2)  
CFMI IPC 72-23-00, Fig. 26, Item 790

 E. Access
 (1)  Location Zones
 501 Engine No. 1, Left Inlet
 601 Engine No. 2, Right Inlet
 506 Engine No. 1, Fan Frame
 606 Engine No. 2, Fan Frame

 F. Prepare to Locally Recondition the Abradable Shroud
 S 868-053-C00
 (1)  Make sure the start levers are in the CUTOFF position.
 (a)  Install the DO-NOT-OPERATE tag on the start levers.
 S 868-054-C00
 (2)  Open the applicable circuit breaker and install a DO-NOT-CLOSE tag.
 (a)  P6 Load Control Center
 1) ENG 1 START VALVE
 2) ENG 2 START VALVE

 S 038-055-C00
 CAUTION:_______MAKE SURE YOU INSTALL THE MATS IN THE INLET COWL. THIS WILL PREVENT DAMAGE FROM TOOLS, PARTS OR UNWANTED MATERIAL THAT FALL ON THE INLET COWL.
 (3)  Install the mats into the lower half of the inlet cowl.
 S 348-102-C00
 CAUTION:_______THIS REPAIR MUST NOT BE DONE IN A HUMID ATMOSPHERE. THIS COULD AFFECT THE QUALITY OF THE BONDING COMPOUND. THE MINIMUM TEMPERATURE MUST BE 60°F (15°C).
 (4)  Take reference measurements of the clearance between the fan blade
 tip and the abradable liner at several locations around the liner.

 (a)  
Use only one blade as reference.

 (b)  
Make a record of the dimensions.

 S 018-056-C00
 (5)  Remove a sufficient number of fan blades to get access to the repair area (AMM 72-31-02/401).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
　
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