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 ALL  ú ú B01 Page 607 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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A
737-300/400/500MAINTENANCE MANUAL
 PROTECTIVE FINISHES - DESCRIPTION AND OPERATION
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General
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 A.  Structure of the airplane is protected from corrosion by application of various finishes. The finish applied depends upon the parent material and upon whether the surface is an interior or exterior surface. The following finishes are applied to new airplanes and recommended for refinishing of all.
 B.  Interior surfaces requiring special protective finishes.
 (1)  
Epoxy primer and BMS 10-11 Type II white enamel on areas near and below the battery, galley and toilet for corrosion protection.

 (2)  
BMS 10-11 Type I primer and BMS 10-11 Type II white enamel on fuselage bilge areas and electronic compartments for protection and to provide better visibility for maintenance purposes.

 NOTE: For in-service repairs to the interior finish where
____ appearance is not of concern, it is acceptable to use two coats of BMS 10-11, Type I primer instead of the BMS 10-11 primer plus white enamel. Test have shown that two coats of primer is as effective as the primer plus enamel for protection against corrosion.
 (3)  
Fuel tank coating in integral fuel tanks (Ref Chapter 28, Fuel).

 (4)  
BMS 5-89 corrosion inhibiting adhesive primer (CIAP) is required production primer for all structural bonded assemblies. The structural bonded assembly receives a subsequent coating of BMS 10-11 or BMS 10-79 primer on top of CIAP.

 C.  Exterior surfaces requiring special protective finishes.
 (1)  
Epoxy primer and white enamel on critical corrosion areas including wing and empennage spar cavities, cove areas, and wheel wells.

 (2)  
Epoxy primer and Corogard on wing upper inspar skins and other selective areas.

 (3)  
BMS 10-79 primer and BMS 10-60 flexible polyurethane enamel on wing lower inspar skins, and leading and trailing edge panels of wing, fin and stabilizer. This finish system is also recommended for structure surrounding the emergency exit hatches, outboard flap track fairings and skate angeles for flap track and engine nacelle to wing fairings.

Hydraulic Fluid Contamination Areas
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 A.  Certain areas on the airplane are subject to contamination by hydraulic fluid. See Fig. 1 for the locations of the possible hydraulic fluid contamination areas.
Exterior Decorative Markings
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 A.  Exterior decorative marking drawing is listed on Boeing drawing 65-61373.
 WARNING:_______DO NOT PAINT PRESSURE RELIEF VALVE OR OUTFLOW VALVE. PAINT MAY PREVENT PRESSURE RELIEF VALVE OR OUTFLOW VALVE FROM PROPER OPERATION: NO PAINT SHOULD BE APPLIED FOR A ONE INCH WIDE CIRCULAR BAND AROUND OR ON THE PRESSURE RELIEF VALVE DOORS OR OUTFLOW VALVE.
 (1)  Obey this warning during all of this task.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 51-21-00
 ALL  ú ú B01 Page 1 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
BOTTOM VIEW
TOP VIEW
LEFT SIDE VIEW
INTERIOR AND EXTERIOR
EXTERIOR
1 ENGINE AREA AND COWLING ARE SUBJECT TO INTERIOR AND EXTERIOR HYDRAULIC FLUID CONTAMINATION
Hydraulic Fluid Contamination Areas Figure 1
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 51-21-00
 ALL  ú ú B01 Page 2 ú Oct 20/83
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 PROTECTIVE FINISHES - CLEANING/PAINTING
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 TASK 51-21-00-107-003-B00
　
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