747-400 AMM 飞机维护手册 结构 STRUCTURES(46)

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____ a bare surface are signs of hydraulic fluid contamination. The titanium parts in fire-resistant hydraulic fluid areas have a flat, black inorganic finish. Make sure you know the difference between the fire-resistant hydraulic fluid contamination and the fire-resistant hydraulic fluid residue.
 (a)  Clean with cheesecloth or aluminum wool that is moist with Oakite 61 or equivalent.
 NOTE: If you use the aluminum wool, make sure it is
____ sufficiently coarse to make the surface not shiny. Do not clean a shiny or polished surface.
 (b)  
Flush the surface with water.

 (c)  
Remove the unwanted moisture with cheesecloth.

 (d)  
Flush the surface with a clean wet cloth.

 (e)  
Flush the surface with water until you get a water break-free surface.

 NOTE: A water break-free surface will have a continuous layer
____
 of water for 30 seconds.

 S 117-006
 (5)  To remove the remaining unwanted material, do the steps that follow:
 (a)  
Use the cheesecloth to remove the unwanted material with the Stoddard solvent.

 (b)  
Flush the surface fully with water. Use the high pressure flush if it is possible.

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747-400 MAINTENANCE MANUAL
 (c)  Clean with Stoddard solvent and flush the surface with water until you get a water break-free surface.
 NOTE: A water break-free surface will have a continuous layer
____
 of water for 30 seconds.

 (d)  Let the surface dry.
 S 157-007
 (6)  To remove the unwanted coating, do the steps that follow:
 WARNING:_______ALKALINE IS STRONGLY OXIDIZING WHEN USED AT 200°F. WEAR GOGGLES AND HEAVY RUBBER GLOVES AND DO NOT TOUCH THE ALKALINE. USE MILD STEEL CONTAINERS AND HANDLING EQUIPMENT. DO NOT TOUCH THE ALKALINE WITH ORGANIC SOLVENTS SUCH AS ACETONE OR METHYL ETHYL KETONE WHICH CAN CAUSE EXPLOSION.
 (a)  
Refer to the direction on the container to prepare the Turco 4338 stripper.

 (b)  
Put the parts in the stripper for 30 to 40 minutes.

 (c)  
Flush the parts with water.

 (d)  
Wash the parts with air water spray.

 (e)  
Do the step (6) again until the black coating is removed.

 S 967-008
 (7)  Replace the parts that have metal corrosion.
 D. Apply High Temperature Coating
 S 377-023
 CAUTION:_______DO NOT SHAKE THE COATING. IF YOU SHAKE THE COATING, THE AIR WILL STAY IN THE COATING, AND THE COATING WILL HAVE AN UNSATISFACTORY SURFACE.
 (1)  Slowly add distilled or deionized water to the B-2000 coating. Refer to the container instructions while you slowly shake the mixture.
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MAINTENANCE MANUAL

 S 377-024
 CAUTION: DO NOT APPLY B-2000 COATING WHERE THERE ARE OTHER SOLVENTS IN
_______ THE AIR, BECAUSE THIS CAUSES FILM CRATERING AND UNSATISFACTORY BOND.
 (2)  Brush or spray apply mixed B-2000 coating to a dry film thickness of
 0.8 to 1.2 mils.
 NOTE: If you use a brush, the brush must have soft, high quality
____
 bristles.

 S 377-011
 (3)  
Permit to air dry a minimum of 1 hour at 70 to 90°F.

 S 377-012

 (4)  
Bake the coating at 350 |25°F a minimum of 1 hour.

 NOTE:____The coating must be dry before you bake. If a blister occurs when you bake, increase the air dry time.
 TASK 51-24-08-307-013
 3. Apply BMS 10-82 Coating
_______________________
 A. Consumable Materials
 (1)  
C00314 Coating - Low Emissivity Gold, BMS 10-82

 (2)  
B00184 Solvent - BMS 11-7

 (3)  
B00394 Solvent - Toluene, TT-T-548
　
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