747-400 AMM 飞机维护手册 结构 STRUCTURES(59)

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 (1)  This procedure gives instructions to apply the water-displacing corrosion preventive compound, BMS 3-23. We recommended that you apply the BMS 3-23 periodically.
 NOTE: Each operator must know his aircraft's environment, the
____ corrosion preventive compound used, and when it was applied. If not, the corrosion protection can be unsatifactory. Boeing made BMS 3-23 as a standard for organic corrosion inhibitors and recommends its use. But, there are other water-displacing corrosion preventive compounds that can be satisfactory.
 CAUTION: KEEP BMS 3-23 AWAY FROM SURFACES THAT CAN BE 300°F OR MORE
_______ DURING USE. THE DRY FILM FLASH POINT IS 500°F. THE BMS 3-23 CAN CAUSE A FIRE OR AN EXPLOSION.
 (2)  
The BMS 3-23 is not satisfactory for surfaces that can be more than 150°F because it contains wax compounds.

 (3)  
It is not easy to apply a primer and paint on the BMS 3-23. The BMS 3-23 gets in the surface and can bleed-out. This can cause the primer and paint to have a unsatisfactory bond.

 (4)  
Let the primer and enamel dry for a minimum of 8 hours before you apply the BMS 3-23.

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747-400
MAINTENANCE MANUAL

 (5)  
Apply masking tape and paper or plastic to the area where you will not apply the BMS 3-23.

 (6)  
Apply tape and plastic to the electrical connectors to prevent contamination on the electrical contacts.

 (7)  
Do not apply BMS 3-23 to the actuator rods.

 NOTE: BMS 3-23 or all other hydrocarbons can cause
____ damage to the seals that are used with BMS 3-11 hydraulic fluid.
 (8)  Be careful when you apply the BMS 3-23 near to silicone rubber seals or clamps with rubber lining.
 WARNING: DO NOT LET CORROSION PREVENTIVE COMPOUND GET IN THE OXYGEN
_______ SYSTEM. IF THE CORROSION PREVENTIVE COMPOUND GETS IN THE OXYGEN SYSTEM, A FIRE OR AN EXPLOSION CAN OCCUR.
 (9)  Make sure you keep the BMS 3-23 corrosion preventive compound out of the oxygen system (AMM 35-00-00/201).
 NOTE:____Masking tape is not sufficient. Use plastic or equivalent covers to fully seal the equipment.
 B. Consumable Materials
 (1)  
G00009 Compound - Corrosion Preventive, BMS 3-23, Type I or Type II

 (2)  
C00755 Compound - Corrosion Preventive, BMS 3-26, Type I

 (3)  
C00915 Compound - Corrosion Preventive Advanced, BMS 3-29

 (4)  
G00034 Cheesecloth - Clean and Lint-Free

 (5)  
G00268 Paint Brush - Nylon or Bristle

 C. References
 (1)  AMM 51-41-03/401, Fuselage Drain Valve - Removal/Installation
 D. Procedure
 S 027-018
 (1)  
Remove the drain valves (AMM 51-41-03/401).

 (2)  
Apply the necessary masking tape and plastic.

 S 497-019
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747-400 MAINTENANCE MANUAL
 S 627-011
 (3)  Apply a layer of the corrosion preventive compound. You can spray it, use a brush or a cloth to apply it.
 NOTE: Make sure a sufficient quantity of air can flow through the
____ closed areas like the cavities and cargo compartments.
 S 627-012
 (4)  
Permit the layer to stay on the surface for a minimum of 30 minutes to make sure it gets into the mating surfaces.

 S 147-013

 (5)  
Remove the unwanted corrosion preventive compound from the surface with clean wipers.

 NOTE:____Only a thin layer is necessary. A thick layer will not give better protection than a thin layer, and will hold dirt.
 S 957-014
 (6)
Remove all the masking tape, and the protective paper or plastic.

 S 847-015

 (7)  
Make sure a sufficient quantity of air can flow through the closed areas like the cavities and cargo compartments until they are dry.
　
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