72-31-01
ú ú N01 Page 803 ú Feb 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 028-027-N00
(3)
Do the steps that follow to replace the seal.
(a)
With a scraper, remove the seal.
(b)
Clean the surface with a clean lint-free cotton cloth that is wet with Alcohol. 1) Let the surface become dry.
(c)
Install a new seal around and in the space on the inlet cone support.
(d)
Cut the seal to the correct length as shown in Fig. 801.
(e)
Clean the cut ends of the seal with a clean lint-free cotton cloth that is wet with Alcohol. 1) Let the surface become dry.
(f)
Apply a continuous layer of the silicone rubber sealant, approximately 0.010 inch (0.254 mm) in thickness, on the cut ends of the new seal.
(g)
Bond the ends of the seal together to make a continuous circle.
(h)
Let the sealant cure as follows: 1) In air at a temperature of 70-95°F (21.35°C), and a
relative humidity of not less than 50 percent, 2) A minimum of 24 hours, 3) In an area that is free of oil, fumes, spray, and other
unwanted material.
NOTE: To make a good bond, materials, tools, fixtures and
____ equipment must also be free of unwanted materials.
(i)
With a non-metallic grit cloth, make the bonding joints of the seal rough until it has a continuous matt finish. 1) Clean this area with a clean lint-free cotton cloth that is
wet with Alcohol.
a) Let the bonding joints become dry.
(j)
Apply a thin continous film of the silicon rubber sealant on the bonding joints of the seal and inner diameter of the inlet cone support. 1) Bond the seal to the inlet cone.
(k)
Let the sealant cure in air at ambient temperature, a minimum of 24 hours.
NOTE: Use the same cure conditions as with the ends of the
____
seal.
S 418-011-N00
(4)
Install the inlet cone (AMM 72-31-01/401).
(5)
Remove the protective mat from the inlet cone.
S 438-028-N00
TASK 72-31-01-308-012-N00
3. Inlet Cone Polyurethane Finish Repair
_____________________________________
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72-31-01
ALL ú ú N01 Page 804 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
1. PROTECTIVE POLYURETHANE COATING
L-A3778
Compressor Inlet Cone - Protective Finish Restoration Figure 802
A87913
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72-31-01
ALL ú ú N01 Page 805 ú Oct 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
A. General
(1)
This procedure gives the steps to apply a new polyurethane finish to 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 are
necessary).
C.
Consumable Materials
(1)
G00834 Cloth - Cotton, Lintfree
(2)
C00672 Coating - Polyurethane, PWA 36013
(3)
C00690 Coating - Polyurethane, PWA 36014
(4)
G01077 Paper - Emery (No. 250 Grit)
(5)
B00740 Alcohol - Isopropyl (PMC 9094)
D.
References
