747-400 AMM 飞机维护手册 结构 STRUCTURES(19)

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 NOTE: If it is necessary to rub the surface to the bare
____ metal, prepare the surface as if it was not painted.
 2)  Before you apply the topcoat, clean the surface with tack rags to remove dust and lint.
 (b) For Epoxy primer that was applied for more than 48 hours:
 CAUTION: USING COARSE GRIT ABRASIVES CAN CAUSE DAMAGE TO THE
_______ SUBSTRATE FIBERS IF THE GRIT COMES IN CONTACT WITH THE RESIN COATING OF THE COMPOSITE SUBSTRATE. TO REDUCE THE POSSIBILITY OF DAMAGE TO THE COMPOSITE SUBSTRATE, ONCE THE TOPCAOT HAS BEEN REMOVED, USE PROGRESSIVELY FINER GRITS TO OBTAIN THE REQUIRED SURFACE FINISH.
 1)  Use abrasive papers or pads to remove rough surfaces and loose soil. It is optional to use coarse grit abrasives for expedient cleaning and material removal to the first paint topcoat layer.
 NOTE: Do not use abrasive paper on rough surfaces such as
____ castings and forgings. Use a tack rag or solvent to clean these surfaces.
 2)  Rub the surface with a clean cheesecloth that is moist with solvent.
 NOTE: Rub glossy enamel surfaces until the gloss is
____
 removed.

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 3) Dry the surface with a clean dry cheesecloth.
 NOTE: Make sure that the surface is dry before you apply
____ the finish.
 (c)  
For Prestec that was applied in less than 12 hours: 1) It is not necessary to prepare the surface.

 (d)  
For Prestec that was applied in more than 12 hours: 1) Rub the surface with 240 grit (minimum) abrasive paper. 2) Remove all the remaining particles and soils with a

 cheesecloth that is moist with naphtha. 3) Before the solvent becomes dry, rub the surface with a clean dry cheesecloth.
 TASK 51-21-02-107-031
 4. Clean and Prepare Plastic Surfaces
__________________________________
 A. Equipment
 (1)  
Wood or plastic scrapers; Commercially
 available

 (2)  
Stiff bristle brush; Commercially available

 (3)  
Spray equipment; Commercially available

 B. Consumable Materials
 (1)  
Masking Materials

 (a)  
Aluminum foil tapes
 1) G00117 Permacel P-112
 2) G00291 Scotch No. 425

 (b)  
Masking tapes
 1) G00366 Permacel P-705
 2) G00132 3M No. 214
 3) G00367 Mystic 6223

 (c)  
G00111 Plastic film mylar or polyethylene

 (d)  
G00365 Polyethylene coated paper,
 VV-P-272C

 (e)  
G00301 Protex 20V

 

 (2)  
Solvents

 (a)  
G00148 Methyl Ethyl Ketone (MEK) -TT-M-261

 (b)  
B00135 Naphtha

 (c)  
B00151 Methyl Iso-Butyl Ketone (MIBK) TT-M-268

 (d)  
B00153 Toluene (Toluol) TT-T-548 or JAN-T-171 Grade A

 (e)  
1:1 MEK-Toluene Mixture

 (f)  
B00189 Thinner, TL-52

 

 (3)  
G00034 Cheesecloth

 (4)  
Other Materials

 (a)  
G00251 Aluminum Oxide Abrasive Paper, 240-grit (minimum)

 (b)  
B00340 Silicon carbide paper, 240-grit (minimum)

 

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747-400 MAINTENANCE MANUAL
 (c)  
B00102 Silicon carbide abrasive disc (Bear
 Tex) 240-grit (minimum)

 (d)  
B00107 Scotchbrite sheets, Type A,
 Aluminum Oxide Abrasive 240-grit
 (minimum)

 (e)  
B00101 Nylon pad, Aluminum Oxide Abrasive,
 Type F, 240-grit (minimum)

 (f)  
B00137 Abrasive paper 240-grit (minimum),
 P-P-121
　
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