(1)  
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 polyurethane finish of the inlet cone.

 S 498-029-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.

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

 S 348-031-N00

 (3)  
Do the steps that follow to repair the polyurethane finish of the
 inlet cone (Fig. 801).

 (a)  
With the emery paper, remove the polyurethane finish from the fiberglass in the damaged area.

 S 018-030-N00
 NOTE: Small flakes and scratches can be made smooth, but it is
____ not necessary to completely remove the finish.
 (b)  Clean the surface with a clean, lint-free cotton cloth that is wet with Alcohol. 1) Let the surface become dry.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
WARNING: MIX THE POLYURETHANE IN AN AREA THAT HAS A GOOD FLOW OF
_______ AIR. DO NOT GET THE POLYURETHANE IN YOUR MOUTH OR EYES, OR ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM THE POLYURETHANE. PUT ON PROTECTIVE SPLASH GOGGLES AND GLOVES WHEN YOU USE THE POLYURETHANE. THE POLYURETHANE CAN CAUSE INJURY TO PERSONS.
 (c)  
Paint one layer of the polyurethane coating (PWA 36014) in the area that is shown. 1) Let the surface become dry.

 (d)  
Do the steps that follow to make a new surface on the inlet cone. 1) Paint one layer of the polyurethane coating (PWA 36013) in

 the area that is shown. 2) Let the surface become dry. 3) Paint one more layer of the polyurethane coating (PWA
 36013) in a direction that is different from the direction of the top layer. 4) Do these steps again until there is a total of five new layers of the polyurethane coating (PWA 36013).
 S 418-032-N00
 (4)
Install the outer segment of the inlet cone (AMM 72-31-01/401).

 S 098-033-N00

 (5)  
Remove the protective mat from the inlet cowl.

 TASK 72-31-01-308-017-N00
 4. Inlet Cone Surface Repair
_________________________
 A. General
 (1)  
This procedure gives the steps to repair the fiberglass surface of the inlet cone.

 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)  
G01099 Paper - Emery (No. 60 Grit)

 (3)  
A00000 Resin - Liquid Epoxy (PWA 421-2)

 (4)  
C00691 Agent - Curing, Epoxy Resin (PWA 422-1)

 (5)  
B00740 Alcohol - Isopropyl (PMC 9094)

 D.
References

 (1)  
AMM 72-31-01/401, Inlet Cone

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 ALL  ú ú N01 Page 807 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////

Surface Damage Repair
Figure 803

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