(c)  
Remove the sponges and cotton rags when they are soaked.

 (d)  
Count the number of sponges and cotton rags as they are removed from the fuel tank.

 (e)  
Make sure the counts agree.

 (f)  
Make sure you remove all sponges and cotton rags from the fuel tank.

 WARNING: SPONGES AND RAGS USED TO CLEAN THE FUEL TANK ARE A FIRE
_______ HAZARD. FOLLOW APPROVED PROCEDURES FOR FUEL SOAKED SPONGES AND RAGS. DO NOT PUT FUEL SOAKED SPONGES AND RAGS IN UNAPPROVED BARRELS. SPONGES AND RAGS THAT ARE NOT CORRECTLY HANDLED CAN CAUSE A FIRE. A FIRE CAN CAUSE SERIOUS INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (g)  Follow approved procedures to dispose of or clean the fuel soaked sponges and rags.
 S 362-598
 (20)
 Do the necessary repair or maintenance procedures.

 S 082-601

 (21)
 After you complete the maintenance do this task: Fuel Tank Closure.

 TASK 28-11-00-002-580
 4.  Fuel Tank Closure__________________
 A. General
 (1)  
After you do the maintenance, do this task to close the fuel tank.

 (2)  
Make sure you read and obey the precautions in this task: Purging and Fuel Tank Entry Precautions.

 B.
References

 (1)  
AMM 12-11-01/301, Fuel Servicing

 (2)  
AMM 12-11-01/301, Fuel Servicing

 (3)  
AMM 28-11-00/201, Fuel Tanks

 (4)  
AMM 28-11-01/401, Center Wing Tank Access Door

 (5)  
AMM 28-11-02/401, Reserve and Main Tank Access Door

 (6)  
AMM 28-11-03/401, Surge Tank Access Doors

 (7)  
AMM 28-11-06/401, Center Wing Tank Purge Door

 C.
Access

 (1)  
Location Zones
 130 Center Wing Tank
 500 Wing Tanks, Left
 600 Wing Tanks, Right

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747-400 MAINTENANCE MANUAL
 D. Clean the Fuel Tank
 S 212-592
 (1)  
Each time you go into a fuel tank you must examine the fuel tank very carefully before you close it.

 S 082-581

 (2)  
Remove all of the equipment used to perform the maintenance (for example, tools, solvent containers, plugs, brushes, and other equipment).

 NOTE: Keep a written record of all the tools, equipment, material,
____ and persons when they go into and go out of the fuel tank. Before you close the fuel tank, make sure the record shows there are no unwanted items in the tank.
 S 162-600
 (3)  Use a lint free wiper to clean any unwanted solvents, liquids or grease.
 S 162-583
 WARNING: GROUND ALL OF THE EQUIPMENT AND THE HOSES USED IN THE FUEL TANK
_______ OR ADJACENT TO THE OPEN FUEL TANK. IF YOU DO NOT GROUND ALL OF THE EQUIPMENT AND HOSES, AN EXPLOSION CAN OCCUR.
 WARNING: ONLY USE SHOP AIR OR BOTTLED AIR AS THE SOURCE OF GAS TO POWER
_______ AIR DRIVEN EQUIPMENT. GASES OTHER THAN SHOP OR BOTTLED AIR CAN REMOVE OXYGEN FROM A CLOSED AREA. IF YOU GO INTO A CLOSED AREA WITHOUT ENOUGH OXYGEN, YOU CAN BECOME UNCONSCIOUS OR IT CAN KILL YOU.
 (4)  
Only use shop air or bottled air as a gas source for air-driven tools. Do not use nitrogen, oxygen, carbon dioxide (CO2) or any other non-air source of gas.

 S 162-595

 (5)  
Use an air driven vacuum to remove unwanted particles and pieces of used sealant.

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747-400 MAINTENANCE MANUAL
 E. Inspect the Fuel Tank
 S 212-584
 (1)  Examine all the repairs, sealant and finishes to make sure they are correct and complete.
 S 212-585
 WARNING: MAKE SURE YOU REMOVE ALL UNWANTED PARTICLES AND MATERIALS FROM
　
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