(2)
G00011 Etchant - TEC 361
B. References
(1) SRM 51-20-01, Protective Treatment of Metallic and Graphite Materials
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A 737-300/400/500MAINTENANCE MANUAL
EXTRUDED SEALANT
PUSH THE METAL SEAL COVER INTO POSITION
METAL NOTE: THE NOZZLE SIZE
SEAL DEPENDS ON THE
COVER SIZE OF THE METAL SEAL COVER
SEALING GUN
FILL THE METAL SEAL COVER
Metal Seal Cover Installation Figure 813
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C. Access
(1) Location Zones
221 Center Section Fuel Tank
305 Left Wing Fuel Tank
405 Right Wing Fuel Tank
D. Remove the Fuel Tank Corrosion
S 118-278
(1) Clean the fuel tank surfaces that have corrosion with BMS 11-7 solvent.
METAL
Installed Metal Seal Cover
Figure 814
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S 378-279
(2)
Apply the etchant on the cleaned fuel tank surfaces with corrosion.
S 378-280
(3)
Keep the etchant on the fuel tank surfaces for 3 to 5 minutes.
S 168-281
(4)
Flush the surface with water.
S 118-282
(5)
If you find corrosion on the tank surfaces, do these steps:
(a)
Clean the surfaces that have corrosion with BMS 11-7 solvent.
(b)
Spray, brush, or swab the etchant on the cleaned surfaces and do not remove it for 3-5 minutes.
(c)
Wash the cleaned area with clean water.
E. Repair the Alodine Treatment for Metal Surfaces (If It Is Necessary)
S 388-283
(1) If the alodine treatment is worn or damaged, you must apply the alodine layer before you apply the new sealant or the finish.
CAUTION: USE ONLY ALODINE 600 TO REPAIR ALUMINUM WING SURFACES.
_______ PRIMER ADHESION PROBLEMS CAN OCCUR IF OTHER ALODINE SOLUTIONS ARE USED.
(a) Apply an alodine layer to the surface with Alodine 600 (SRM 51-20-01).
S 398-286
(2) Repair all of the sealant that you removed or caused damage to when you removed the corrosion.
NOTE: Refer to the applicable procedures in the task "Repair of
____
Sealant Leaks in the Fuel Tank Structure".
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A
737-300/400/500MAINTENANCE MANUAL
S 628-287
(3) If it is necessary, do this Task: Application of Corrosion Resistant Finish (Topcoat) (AMM 28-11-00/701).
NOTE: A layer of corrosion resistant finish is necessary only
____ to protect bare (anodized) metal. It is not necessary to apply a layer of corrosion resistant finish on sealant. Corrosion resistant finish can be applied on sealant, but it is not necessary. Usually topcoat is applied to sealant only when it must be applied to protect adjacent bare metal.
TASK 28-11-00-208-288
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