72-31-01
 ALL  ú ú N01 Page 808 ú Oct 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E.  Access
 (1)  
Location Zone
 412 Engine 1 - Front LPC Hub
 422 Engine 2 - Front LPC Hub
 432 Engine 3 - Front LPC Hub
 442 Engine 4 - Front LPC Hub

 F.  
Repair the Inlet Cone.

 S 498-034-N00
 CAUTION: MAKE SURE THAT YOU PUT COVERS ON ALL OF THE LOWER HALF OF THE
_______
 INLET COWL SURFACE. ALSO MAKE SURE THAT THE EDGES OF THE MATS
 TOUCH OR ARE ATTACHED WITH TAPE. IF THE EDGES ARE NOT, THEN
 THE TOOLS OR PARTS CAN FALL AND CAUSE DAMAGE TO THE INLET COWL
 SURFACE.

 (1)  
Put the protective mat on the lower, inner half of the inlet cowl.

 S 018-035-N00

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

 S 348-036-N00

 (3)  
Do the steps that follow to repair the fiberglass surface of the
 inlet cone.

 (a)  
In the damaged area, use emery paper to remove the polyurethane finish from the outer surface of the inlet cone.

 (b)  
With the emery paper, make the surface rough.

 (c)  
Clean the surface with a clean lint-free cotton cloth that is wet with Alcohol. 1) Let the surface become dry.

 (d)  
Mix the applicable quantity of filler compound as follows:

 1)  Mix 100 parts (by weight) of liquid epoxy resin with 25 parts (by weight) of epoxy curing agent at ambient temperature.
 NOTE: The pot life of the compound is 20-30 minutes at
____
 ambient temperature.

 (e)  
Fill the damaged area with the prepared resin compound.

 1)  Make the outer surface of the filled area a small quantity higher than the adjacent surface.

 (f)  
Make the contour the same as the usual contour.

 (g)  
Let the surface have a cure time of 4 hours, at a temperature of 175°F (80°C).

 (h)  
Apply a new polyurethane finish on the repaired area (Ref par. 3).

 (4)  
Install the inlet cone (AMM 72-31-01/401).

 S 418-037-N00
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 72-31-01
 ALL  ú ú N01 Page 809 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 098-038-N00
 (5)  Remove the protective mat from the inlet cowl.
 TASK 72-31-01-358-044-N00
 5.  Front Cone Segment Bolt Pocket Corner Repair____________________________________________
 A. General
 (1)  
This procedure gives the steps to repair the bolt pocket corner of the front inlet cone segment.

 (2)  
This repair is temporary and the part must be replaced at the next schedule maintenance interval.

 B.
Standard Tools and Equipment

 (1)  
Mat - Protective, Rubber
 Manufacturer's Association, Grade 5C43 neoprene
 sponge, 1 inch thick, approximately 5x6 feet
 with warning streamers attached (3 required).

 C.
Consumable Materials

 (1)  
G00834 Cloth - Cotton, Lintfree

 (2)  
B00380 Paper - Aluminum Oxyde (No. 240 Grit)

 (3)  
G02442 Paper - Abrasive (No. 180 Grit)

 (4)  
A00610 Sealant - Silicone

 (5)  
B00740 Alcohol - Isopropyl (PMC 9094)

 D.
References

 (1)  
AMM 70-42-04/201, Degreasing of Parts by Solvent Wiping (SPOP 208)

 (2)  
AMM 72-31-01/401, Inlet Cone

 E.
Access

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

 F.
Repair the Inlet Cone Front Segment.

 S 848-053-N00
 CAUTION: MAKE SURE THAT YOU PUT COVERS ON ALL OF THE LOWER HALF OF THE
_______ INLET COWL SURFACE. ALSO MAKE SURE THAT THE EDGES OF THE MATS TOUCH OR ARE ATTACHED WITH TAPE. IF THE EDGES ARE NOT, THEN THE TOOLS OR PARTS CAN FALL AND CAUSE DAMAGE TO THE INLET COWL SURFACE.
　
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