B.  
Equipment

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

 C.  
Access

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

 D.  
Procedure

 S 866-050-N00
 CAUTION:_______MAKE SURE YOU USE A PROTECTIVE MAT. IF YOU DO NOT, DAMAGE MAY RESULT TO THE INNER SURFACE OF THE INLET COWL.
 (1)  
Put the protective mat on the inner surface of the inlet cowl.

 S 016-051-N00

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

 S 216-052-N00
 WARNING: TO PREVENT INJURY TO YOUR HANDS, GLOVES SHOULD BE WORN WHEN YOU
_______
 HANDLE THE BLADES.

 (3)  
Examine the platform for loose rubber seals or for rubber seals that have damage or are not there.

 (a)  
Replace rubber seals that are loose, have damage or are not there (AMM 72-31-02/801).

 NOTE: Partially unbonded or raised seals must be trimmed
____ so they do not protrude into the airstream.
 1)  A maximim of six (6) seals can be partially or completely missing.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
2) A mamimum of two (2) adjacent blades can have partial or missing seals. 3) Non-adjacent missing or partially missing seals must be seperated by a minimum of six (6) blades.
 S 216-053-N00
 (4)  
Examine Areas A, B, and C for worn areas, nicks, dents and other damage (Fig. 607, and Table 603).

 (a)  
Repair blades that have damage that is more than the limits.

 ~...............................................................................
 |  |  MAXIMUM DEPTH OF DAMAGE ON THE BLADE ROOT  |
 |  .........................................................
 |  EXAMINE THESE AREAS  | PERMITTED WITHOUT REPAIRS |  PERMITTED IF REPAIRED  |

 ................................................................................. | Dimension 1 | 0.200 Inch | | | (For Reference) | (5.080 mm) Minimum | | ................................................................................. | Area A | 0.005 Inch | 0.040 inch | | Root Edge | (0.127 mm) | (1.016 mm) | ................................................................................. | Area B | 0.005 Inch | 0.020 inch | | Platform Surface | (0.127 mm) | (0.508 mm) | ................................................................................. | Area C | 0.000 Inch | 0.005 inch | | Radius Under Platform | (0.000 mm) | (0.127 mm) | 2.......................…...........................…...........................1
 Blade Root Inspection Limits Table 603
 S 216-054-N00
 (5)  
Examine Area D for galling.

 (a)  
If you find much galling, you must use the visual inspection that is in the Engine Manual to Examine the Fan Blade.

 S 216-055-N00
 (6)  
Examine all areas of the blade root for cracks.

 (a)  
Remove fan blades that have cracks in the blade root, because you cannot repair cracks in the blade root.

 S 866-056-N00
 (7)  
If you are done with the fan blade inspections, do the steps that follow:

 (a)  
Install the inlet cone (AMM 72-31-01/401).

 (b)  
Remove the protective mat from the inlet cowl.

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 72-31-02
 ALL  ú ú N01 Page 616 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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