(15)
 G00382 Paper - Abrasive, Aluminum Oxide, 240 Grit (Minimum)

 (16)
 B00340 Paper - Abrasive, Silicon Carbide, 240 Grit (Minimum)

 (17)
 Fabric or Pad - Abrasive, Very Fine or Ultrafine

 (a)
B00107 Aluminum Oxide, Scotchbrite, Type A

 (b)
B00102 Aluminum Oxide, Bear - Tex

 (c)
B00102 Silicon Carbide, Bear - Tex

 (18)
 B00102 Disk - Abrasive, Silicone Carbide (Bear Tex) 240 Grit or Finer

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 51-21-21
 ALL  ú ú B02 Page 701 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 C. References
 (1)  AMM 51-31-00/201, Seals and Sealing
 D. Clean the Surface
 S 957-036-B00
 CAUTION: SEALANTS AND SMOOTHER CAN BE DAMAGED DURING PREPAINT CLEANING
_______ OPERATIONS. DAMAGED SEALANT AND SMOOTHER WILL NOT BOND TO THE SURFACE AND MUST BE REMOVED.
 (1)  
Put covers on all adjacent areas.

 S 167-002-B00

 (2)  
Clean the surface.

 NOTE: Do not clean anodized surfaces with abrasive disks, fabrics,
____ pads, or paper if you will not paint the surfaces.
 (a)  
Remove all temporary protective coatings.

 (b)  
Use a spray gun to remove all the remaining stripper material, loose dust particles and contamination.

 (c)  
Use water, at a temperature between 135 to 145°F, and at a rate of 10 to 20 gallons per minute.

 WARNING: DO NOT GET METHYL ETHYL KETONE (MEK) IN YOUR MOUTH OR
_______ EYES, OR ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM MEK. PUT ON A PROTECTIVE SPLASH GOGGLE AND GLOVES WHEN YOU USE MEK. KEEP MEK AWAY FROM SPARKS, FLAME, AND HEAT. MEK IS A POISONOUS AND FLAMMABLE SOLVENT WHICH CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 CAUTION: BE CAREFUL WHEN YOU CLEAN AROUND THE FASTENERS, SEAMS AND
_______ LAP JOINTS. THIS IS TO PREVENT DAMAGE TO THE FASTENERS, SEAMS AND LAP JOINTS.
 (d)  Use a rigid bristle brush that is moist with MEK and toluene
 (1:1 mixture by volume) to clean around fasteners, seams and lap joints.
 NOTE: You can isolate the sealant bead from the skin when you
____ clean with MEK and Toluene. Do not do a test of the sealant bead bond with your fingernail or with a knife. Only do a visual inspection of the interface between the sealant bead and the skin.
 S 357-003-B00
 (3)  Repair all damaged sealant (AMM 51-31-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 51-21-21
 ALL  ú ú B01 Page 702 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 127-004-B00
 (4)  
Remove the sealant bead where the separation occurs between the body of the sealant bead and the airplane skin.

 S 167-005-B00

 (5)  
If the separation is confined to the thin edge of the sealant bead, do these steps:

 (a)  
Remove the sealant where the separation occurs with MEK or a

 1:1 solution of MEK and toulene.

 (b)  
Carefully rub the surface with abrasive paper, fabric or a pad.

 S 127-006-B00
 (6)  Use silicon carbide paper to make the stainless steel and titanium surfaces rough.
 NOTE: The surfaces with aluminum flame-sprayed fiberglass or
____ Alodine 1200 must not be made rough.
 S 117-007-B00
 (7)  Clean the surface with a 1:1 solution of MEK and toulene before you paint the surface.
 (a)  Clean the surface until you can see no signs of dirt on a cheesecloth.
 TASK 51-21-21-307-014-B00
 3. Surface Pretreatment
____________________
 A. Equipment
 (1)  Tack Rags; Commercially available
 B. Consumable Materials
 (1)  
B00325 Cleaner - Alkaline, Jet Clean E

 (2)  
B00335 Cleaner - Alkaline, TEC 86-2

 (3)  
B00189 Solvent - Thinner, TL-52
　
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