747-400 AMM 飞机维护手册 结构 STRUCTURES(24)

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 (b)  Apply the protective finish as soon as possible to avoid soiling, scuffing, or the start of new corrosion.
 S 107-003
 (5)  Do the subsequent steps to remove steel corrosion (steel parts heat-treated to 180 ksi or less):
 CAUTION: WHEN THE HEAT-TREAT VALUE OF A PART IS UNKNOWN, PREPARE
_______ THE PART AS IF IT WAS HEAT-TREATED OVER 180 KSI AND DO NOT APPLY ACID SOLUTIONS TO THE PART. MAKE SURE THAT ALL ADJACENT AREAS HAVE PROTECTION DURING THE REMOVAL OF CORROSION. DAMAGE TO THE PART CAN OCCUR IF THERE IS NO PROTECTION FROM THE ACID SOLUTIONS.
 (a)  Remove all loose corrosion with a stainless steel wool and a wire brush.
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747-400 MAINTENANCE MANUAL
 CAUTION: APPLY THE ACID SOLUTION ONLY ON THE AREAS OF CORROSION.
_______
 DAMAGE TO THE ADJACENT AREA CAN OCCUR.

 (b)  Use a phosphoric acid corrosion remover to remove the remaining corrosion from the surface.
 NOTE: Use one part of phosphoric acid corrosion remover to
____
 three parts of water.

 (c)  
Let the acid solution stay on the surface until you can see a gray coating.

 (d)  
Flush the surface with clean water.

 (e)  
Clean the surface with a moist cloth. Let the surface dry. Use a machine to dry the surface if it is possible.

 (f)  
Immediately apply protective finish when it is necessary.

 S 107-005
 (6)  Do the subsequent steps to remove steel corrosion (steel parts heat-treated over 180 ksi, optional for parts less than 180 ksi):
 CAUTION: MAKE SURE ALL THE ADJACENT AREAS HAVE PROTECTION DURING
_______ THE MANUAL REMOVAL OF CORROSION. DAMAGE CAN OCCUR IF THE ADJACENT AREAS DO NOT HAVE PROTECTION.
 (a)  
Use 220 grit (maximum) abrasive paper or dry abrasive blast the surface to remove corrosion.

 (b)  
Use a solvent to clean the surface.

 (c)  
Apply protective finish.

 NOTE: Apply primer coats in 1 hour after you rub or dry-blast
____
 the surface.

 S 107-006
 (7)  Do the subsequent steps to remove corrosion from resisting steel (all types), nickel-base alloys and titanium:
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

 WARNING:_______ SMALL PARTICLES OF TITANIUM ALLOY CAN EASILY CAUSE
 IGNITION.  USE DRY TALC, CALCIUM CARBONATE, SAND, OR
 GRAPHITE TO EXTINGUISH A TITANIUM ALLOY FIRE.  DO NOT USE
 WATER, CARBON DIOXIDE, CARBON TETRACHLORIDE, OR AN
 ORDINARY DRY CHEMICAL FIRE EXTINGUISHER TO EXTINGUISH A
 TITANIUM ALLOY FIRE.  INJURY OR DAMAGE CAN OCCUR IF
 INCORRECT PROCEDURES ARE USED TO EXTINGUISH A TITANIUM
 ALLOY FIRE.
 CAUTION:_______ MAKE SURE THAT ALL ADJACENT AREAS HAVE PROTECTION WHEN YOU
 REMOVE CORROSION.  DAMAGE CAN OCCUR IF THE ADJACENT AREAS

 DO NOT HAVE PROTECTION DURING THE CORROSION REMOVAL.
 (a)  Use stainless steel wool, a wire brush, fine abrasive paper or abrasive blast to remove corrosion.
 NOTE: Make sure that no particles of corrosion stay on the
____ surface. Rub the surface until all corrosion has been removed.
 (b)  
Polish the surface with 400 grit aluminum oxide paper to remove all scratches.

 (c)  
Remove the remaining particles with solvent alkaline cleaner. Then flush the surface with water.

 (d)  
Use an air blast dry the surface.

 (e)  
Apply protective finish if it is necessary.

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