737-300 400 500 AMM 飞机维护手册 结构 STRUCTURES(49)

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 (c)  Apply sufficient layers to get a total dry thickness of 2-3 mils.
 NOTE: To decrease the effect of bronzing, the Corogard EC-843
____ and EC-843-S material has more pigments than usually necessary. The aluminum pigments can rub off but the quality of the Corogard EC-843 and EC-843-S does not decrease.
 (d) Dry the mixture for a minimum of 24 hours at 65 to 85°F.
 NOTE: The dry time can decrease if you apply heat on the
____ surface at 125 (| 5)°F for 2 hours.
 J. Apply the Aeroflex G12E25 Coating (Preferred)
 S 377-028-B00
 (1)  Prepare the aluminized coating Aeroflex G12E25.
 (a)  Fully mix the Aeroflex G12E25 material for 10-15 minutes manually or use a power mixer.
 NOTE: There must be no air bubbles while you mix the Aeroflex.
____
 (b)  Make sure that the aluminum pigment is constant in the mixture.
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A 737-300/400/500MAINTENANCE MANUAL
 (c)  Use the Aeroflex thinner to make the mixture thin.
 NOTE: The thinner must not be more than 20 percent (by volume)
____
 of the base material.

 (d)  The pot life of this mixture is 4 hours with no temperature limit.
 S 377-029-B00
 (2)  Apply the Aeroflex G12E25.
 (a)  
Apply BMS 10-11 and BMS 10-20 primer on the surface.

 (b)  
Let the primer dry before you apply the mixture.

 (c)  
Put the Aeroflex mixture through a clean cloth or sieve.

 (d)  
Apply the Corogard mixture with a spray gun.

 (e)  
Add sufficient layers to get a total dry thickness of 2-3 mils

 (0.002 to 0.003 inch).
 NOTE: If the mixture becomes dry when you use Aeroflex G12E25,
____ decrease the atomizing air pressure . You can also add the C25/90S thinner to make the mixture thin as an alternative.
 (f)  
Dry the mixture at 65-85 degrees for a minimum of 4 hours before you move the airplane to an open area.

 (g)  
Dry the mixture for 24 hours before flight.

 NOTE: The dry time can decrease if you apply heat on the
____ surface at 125 +/- 5 degrees for 2 hours.
 K. Repair and Rework
 S 357-030-B00
 (1)  Clean areas with small damages such as scratches and gouges.
 (a)  
Rub the areas smooth with 280 grit (minimum) abrasive paper.

 (b)  
Clean the areas with clean rags moist with toluene or xylene.

 S 377-031-B00
 (2)  Apply the primer and Aeroflex or Corogard.
 (a)  
Feather all the edges.

 (b)  
Use a brush for small damages.

 S 357-032-B00
 (3) Clean areas with EC-843 or EC-843S Corogard or Aeroflex applied.
 (a)  
Fully clean the areas with toluene or xylene.

 (b)  
Rub the areas smooth with 280 grit (minimum) abrasive paper.

 (c)  
Clean the areas again with rags that are moist with toluene or xylene.

 (d)  
Rub the surface dry with a clean cloth.

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737-300/400/500MAINTENANCE MANUAL
 S 227-018-B00
 (4)  Make sure the repair and overlap thickness is not more than 5.0 mils.
 NOTE: The color of the new EC-843 and EC-843S Corogard coating will
____ not be the same as the adjacent surface. The color will become the same in approximately 60 days. Permit the coating to dry a minimum of 4 hours at 65-85°F.
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