(12) E00074 Stripper - Inorganic, Sodium Dichromate
 or Sulfuric Acid

 D. References
 (1)  
AMM 51-21-21/701, Prepaint Cleaning and Treatment

 (2)  
SRM 51-20-01, Corrosion Inhibiting Compound

 E. Procedure - Aluminum Corrosion Removal
 S 357-002-B00
 (1)  Do these steps for general external skin corrosion:
 (a)  
Put the airplane in a location where you can immediately flush all areas with water.

 (b)  
Remove all grease, oil, dirt, and loose paint material (AMM 51-21-21/701).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 CAUTION:_______ACID BRIGHTENERS FOR ALUMINUM CAN CAUSE ILLNESS. USE THEM ONLY WHEN IT IS NECESSARY.
 (c)  Add 1 parts (by volume) of water to the acid brightener.
 CAUTION: DO NOT LET ACID BRIGHTENERS FOR ALUMINUM AND PHOSPHORIC
_______ ACID CORROSION REMOVERS FOR ALUMINUM OR STEEL FALL ON TEFLON LINED SELF-LUBRICATED BEARINGS, ELECTRICAL THERMINAL PLUGS, NYLON COATED WIRES, NYLON BUSHINGS, WHITE THERMAL PROTECTIVE FINISH, OR FABRIC OR PLASTIC SURFACES. THE CHEMICALS IN THE ACID BRIGHTENERS AND THE PHOSPHORIC ACID CORROSION REMOVERS CAN CAUSE DAMAGE TO THESE COMPONENTS AND SURFACES.
 (d)  Apply the acid brightener solution. Start from the bottom of the surface and move up.
 CAUTION: DO NOT LET THE ACID BRIGHTENER SOLUTION STAY ON THE
_______ SURFACE CORROSION FOR MORE THAN 30 MINUTES. DAMAGE TO THE SURFACE CAN OCCUR.
 (e)  Let the acid brightener solution stay on the surfaces for 5 to 30 minutes.
 NOTE: Do not remove corrosion when the airplane temperature
____ is greater than 100° or less than 45°F. Work on a small area. Do not let the acid brightener dry on the surface.
 (f)  
Rub the surface with a nylon brush.

 (g)  
Keep the surface wet with the acid brightener solution.

 (h)  
Use a spray gun to clean the surface with water. Use a light water spray while you remove the corrosion material. Use a high pressure water spray to finish the removal of the corrosion.

 (i)  
Do these steps again for the remaining parts of the airplane.

 (j)  
Flush the surface and the adjacent areas with water.

 NOTE: Make sure you fully clean the wheel well areas, skin
____
 seams, and other holes.

 (k)  
Apply alodine (Alodine 1000) finish on the clad aluminum areas with a brush.

 (l)  
Apply alodine (Alodine 1200S) finish on the nonclad areas.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 357-003-B00
 (2)  Do these steps for light skin corrosion (aluminum):
 NOTE: These steps are optional to the first procedure.
____
 (a)  
Mechanically remove the corrosion with an approved airplane polish.

 (b)  
Clean the surface with a solvent or use a solvent alkaline or emulsion cleaner (SRM 51-20-01). Then flush the surface with water.

 (c)  
Add 4 to 8 parts (by volume) of water to the phosphoric acid corrosion remover.

 (d)  
Apply the phosphoric acid corrosion remover.

 (e)  
Flush the surface and the adjacent areas with water.

 F. Procedure - Steel Corrosion Removal
 S 357-004-B00
 (1)  Do these steps to remove corrosion from steel parts that are heat-treated to 180 KSI or less:
 NOTE: If you do not know the heat-treat of a steel part, prepare
____ the part as if it was heat-treated at 180 KSI or more.
 CAUTION: PUT COVERS ON ALL ADJACENT AREAS THAT DO NOT HAVE
_______ CORROSION. THE CORROSION REMOVAL PROCEDURES CAN CAUSE DAMAGE TO AREAS WITHOUT PROTECTION.
 (a)  Remove corrosion with a stainless steel wool and wire brush.
　
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