B.  
References

 (1)  
AMM 28-11-00/201, Fuel Tanks

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A
747-400
MAINTENANCE MANUAL

 (2)  
AMM 28-11-00/701, Fuel Tanks

 (3)  
AMM 28-26-00/201, Defueling

 (4)  
CPM 20-40-00

 (5)  
SRM 51-10-02

 C.
Consumable Materials

 (1)  
B00184 Solvent, Presealing, Cleaning Solvent - BMS 11-7

 (2)  
G00034 Cheesecloth, gauze - BMS 15-5

 D.
Repair of the Fuel Tank Corrosion

 S 658-215
 (1)  Do this task: Fuel Tank Defueling (AMM 28-26-00/201).
 S 658-216
 WARNING: OBEY THE PURGING AND FUEL TANK ENTRY PROCEDURE PRECAUTIONS.
_______ FAILURE TO OBEY THE PURGING AND FUEL TANK PROCEDURE PRECAUTIONS COULD CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)
Do this task: Purging and Fuel Tank Entry (AMM 28-11-00/201).

 S 148-217

 (3)
Look for corrosion on all structural surfaces of the fuel tank.

 CAUTION: REFER TO THE STRUCTURAL REPAIR MANUAL TO CALCULATE IF THE
_______ STRUCTURE IS WEAK. CORROSION CAN MAKE THE STRUCTURE WEAK.
 (a)  To find and repair damage, do the procedures specified in (SRM 51-10-02) and (CPM 20-40-00).
 S 118-269
 WARNING:_______MAKE SURE YOU HAVE GOOD FLOW OF AIR IN THE AREA. OBEY ALL FIRE SAFETY PRECAUTIONS. POISONOUS AND FLAMMABLE MATERIALS ARE USED THAT CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (4)  
With solvent, BMS 11-7, clean the applicable fuel tank surfaces that have corrosion.

 (5)
Apply etchant over the cleaned fuel tank surfaces with corrosion.

 S 158-220
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 S 178-221
 (6)  
Flush the surface with water.

 S 378-222

 (7)  
To apply the alodine treatment, do this task: Apply the Corrosion Resistant Finish (Topcoat) (AMM 28-11-00/701).

 NOTE: Refer to the Alodine Metal Surface Treatment procedure.
____
 S 398-223
 (8)  
To repair all sealant damaged or removed when you remove corrosion, do the "Repair of Sealant Leaks in Fuel Tank Structure" procedure.

 S 378-224

 (9)  
To apply topcoat, do this task: Apply the Corrosion Resistant Finish (Topcoat) (AMM 28-11-00/701).

 S 418-225

 (10)
 Do this task: Fuel Tank Closure (AMM 28-11-00/201).

 TASK 28-11-00-308-226
 3.  Repair of Sealant Leaks in the Fuel Tank Structure__________________________________________________
 A. General
 (1)  
This task has instructions to do a permanent repair of a damaged seal on the internal surface of an integral fuel tank.

 B.
References

 (1)  
AMM 20-30-93/201, Final Cleaning Prior to Fuel Tank Sealing (Series 93)

 (2)  
AMM 28-11-00/201, Fuel Tanks

 (3)  
AMM 28-11-00/601, Fuel Tanks

 (4)  
AMM 28-11-00/701, Fuel Tank

 (5)  
AMM 28-26-00/201, Defueling

 (6)  
SRM 51-40-00

 (7)  
SRM 57-00-00

 C.
Equipment

 (1)  
Gun - Rivet, Cherry Monel
 (commercially available)

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