20-10-31
 ALL  ú ú 01 Page 401 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 1.

2.

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A
737-300/400/500MAINTENANCE MANUAL
 METAL SURFACES CLEANING/PAINTING
________________________________General
_______
 A.  This procedure contains five tasks:
 (1)  
The first task is to hand clean with abrasives.

 (2)  
The second task is to spot clean with a rotary bonding brush.

 (3)  
The third task is to spot clean with a rotary abrasive disk.

 (4)  
The fourth task is to remove paint with solvent, Series 84 (AMM 20-30-84/201).

 (5)  
The fifth task is to solvent clean bare, clad, or plated metal.

 B.  Use the tasks in this procedure to clean the faying surface bonds and bonding jumper installations. Do not use abrasives or wire brushes on plated surfaces, alclad aluminum that is not painted, or CRES that is not painted.
 TASK 20-10-34-217-014Hand Clean with Abrasives
_________________________
 A.  General
 (1)  
Use this task for titanium. No other task in this procedure is applicable to titanium.

 (2)  
Do not apply abrasives to plated surfaces, alclad aluminum, or CRES.

 B.  Consumable Materials
 (1)  
B00137 Abrasive Paper, 180 grit, Federal Spec
 P-P-121

 (2)  
B000138 Abrasive Cloth, 180-Grit, Federal Spec
 P-C-451

 C.  Procedure
 S 127-002
 CAUTION: DO NOT LET PARTICLES FROM THE ABRASIVE CAUSE CONTAMINATION TO
_______ THE MECHANISMS OR ELECTRICAL EQUIPMENT. DAMAGE CAN OCCUR.
 (1)  Use a circular or elliptical movement of the abrasive paper or cloth to give an equally smooth surface.
 TASK 20-10-34-147-015Spot Clean with a Rotary Bonding Brush
______________________________________
 A.  General
 (1)  
Use this task to remove paint from metal or to remove Alodine, Iridite, or light anodize from aluminum.

 (2)  
Do not use rotary bonding brushes on plated surfaces or on metals not painted (for example, CRES or alclad aluminum). Clean these surfaces with solvent, Series 84 (AMM 20-30-84/201).

 B.  Equipment
 (1)  
Drill motor or other applicable drive

 (2)  
Bonding brush, stainless steel, of correct size (Fig. 701).

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 20-10-34
 ALL  ú ú 01 Page 701 ú Jul 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 C. Procedure
 NOTE: Identify the bonding brush housings you can use on each metal.
____
 Refer to Remove Paint with Lacquer Thinner.

 S 147-021
 CAUTION:_______DO NOT USE CARBON STEEL BONDING BRUSHES. STEEL PARTICLES IN METAL SURFACES COULD CAUSE DANGEROUS CORROSION.
 DO NOT USE ROTARY WIRE BRUSHES OR ABRASIVE DISKS ON TITANIUM. REFER TO PROCEDURE, HAND CLEAN WITH ABRASIVES, TO CLEAN TITANIUM.
 (1)  Clean the necessary area as follows:
 NOTE: Use a drill motor or other applicable drive with a
____ stainless steel bonding brush of the correct size.
 (a)  
Touch the surface with the brush intermittently. Make sure the cutting face is parallel with the surface.

 (b)  
Examine the results after each time you touch the surface with the brush.

 NOTE: Try to remove only the minimum quantity of metal.
____
 (c)  
Continue the procedure until the area is clean.

 (d)  
If you cannot get through an anodic film, use the procedure, Spot Clean with a Rotary Abrasive Disk.

 TASK 20-10-34-147-016
 4. Spot Clean with a Rotary Abrasive Disk
______________________________________
 A. General
 (1)  
Use this task to remove not painted anodize, Iridite, Alodine, BMS 3-11 resistant finish, or other hard finishes. You can use this task to remove paint but the disk will quickly become clogged.

 (2)  
Do not use this task on plated surfaces or metals not painted, for example, CRES or alclad aluminum. Clean these surfaces with a solvent.
　
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