where there is little bond between the sealing compound and the vane or shroud are permitted if the vane is not loose.
 2)  Very small cracks (called crazing), dryness, and areas where there is little bond between the sealing compound and the vane or shroud are not permitted if the vane is loose.
 F.  Put the Airplane Back to its Usual Condition.
 S 326-005-N00
 (1)  
Repair the vanes that must be repaired (AMM 72-31-04/801).

 (2)
Install the applicable 1st-stage fan blades (AMM 72-31-02/401).

 S 416-006-N00
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 72-31-04
 ALL  ú ú N01 Page 605 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
1ST-STAGE STATOR - REPAIRS
__________________________
 1.  General
_______
 A.  This procedure gives the steps to blend the 1st-stage stator vanes.
 B.  The stator assembly is a circular flange to which the stator vanes are attached. This stator assembly is at the forward section of the front compressor, and is immediately aft of the fan rotor blades.
 C.  You must go into the inlet cowl and remove the fan blades to get access to the 1st-stage stator vanes.
 TASK 72-31-04-308-001-N00
 2.  Repair the 1st-Stage Stator (Fig. 801)
___________________________
 A.  General
 (1)  
You will blend the edges or surfaces of the 1st-stage stator vanes to do the repair. You can blend the vanes with a high quality file, an abrasive cloth, or an abrasive stone. You can blend with a slow speed power tool if you must remove a large quantity of material.

 B.  
Standard Tools and Equipment

 (1)  
File - for blend repair

 (2)  
Stone - Fine, for blend repair and finishing

 (3)  
Mat - Protective, Rubber Manufacturer's Association, Grade SC43 neoprene sponge, 1-inch thick, approximately 5x6 feet with warning streamer attached (3 are used).

 C.  
References

 (1)  
AMM 70-31-01/201, Fluorescent Penetrant Inspection

 (2)  
AMM 72-31-01/401, Inlet Cone

 (3)  
AMM 72-31-02/401, 1st-Stage Fan Blade

 (4)  
IPC 72-31-04 Fig. 1

 D.  
Access

 (1)  
Location Zone
 412 Engine 1 - LPC
 422 Engine 2 - LPC
 432 Engine 3 - LPC
 442 Engine 4 - LPC

 E.  
Prepare for the procedure

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 868-010-N00
 CAUTION: MAKE SURE THAT YOU PUT COVERS ON ALL OF THE LOWER INNER SURFACE
_______ OF THE INLET COWL. ALSO MAKE SURE THAT THE EDGES OF THE MATS TOUCH OR ARE ATTACHED WITH SOME TAPE. IF THE EDGES ARE NOT TOGETHER, THE TOOLS OR PARTS CAN FALL AND CAUSE DAMAGE TO THE INLET COWL SURFACE.
 (1)  
Put the protective mats on the lower inner surface of the inlet cowl.

 S 018-011-N00

 (2)  
Remove the inlet cone (AMM 72-31-01/401).

 S 018-012-N00

 (3)  
Remove the 1st-stage fan blades (AMM 72-31-04/401).

 S 868-013-N00

 (4)  
Put the protective mat on the inner surface of the fan case to prevent damage to the rubstrip.

 S 018-014-N00

 (5)
Remove the 1st-stage stator, if it is necessary (AMM 72-31-04/401).

 F.
Repair the 1st-Stage Stator Vanes (Fig. 801).

 S 328-016-N00
 CAUTION: IF YOU USE A POWER TOOL TO BLEND, MAKE SURE THERE IS NOT TOO
_______ MUCH HEAT. DAMAGE TO THE VANE CAN OCCUR IF THERE IS TOO MUCH HEAT ON THE VANE.
 (1)  Use a fine file, an abrasive cloth, or an abrasive stone to do the blend repair.
 NOTE: If the damage is very large or deep, use a slow speed power
____ tool first. Then, blend by hand to make the area smooth.
　
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