B. Consumable Materials
 (1)  
B00130 Alcohol - Isopropyl

 (2)  
G00034 - Wiper, Process Cleaning Absorbent

 C. References
 (1)  
AMM 28-10-00/201, Storage

 (2)  
SRM 57-00-00

 D. Access
 (1)  Location Zones
 221 Center Section Fuel Tank
 305 Left Wing Fuel Tank
 405 Right Wing Fuel Tank

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A
737-300/400/500MAINTENANCE MANUAL
 E. Procedure
 S 017-143
 (1)  
Go into the fuel tank (AMM 28-10-00/201).

 S 017-144

 (2)  
Remove the necessary fuel tank equipment and the support brackets to get access to the area that you must clean.

 S 147-145

 (3)  
Use a fiber brush to loosen the contamination.

 S 117-146

 (4)  
Use clean lint free wipers coated with isopropyl alcohol to remove the contamination.

 S 147-147

 (5)  
Use an air hose or a wire to make sure the limber hole areas are free of unwanted material (Fig. 701).

 S 217-150

 (6)
Do a visual check of the fuel tank structure for corrosion.

 (a)  If you find corrosion, then repair the damage (SRM 57-00-00).
 S 417-148
 (7)  
Install the support brackets and the fuel tank equipment that you removed.

 (8)  
Close and go out of the tank (AMM 28-10-00/201).

 S 417-149
 TASK 28-11-00-107-034
 4.  Fuel Tank Cleaning, Fungus, and Corrosion Removal - Steam Cleaning__________________________________________________________________
 A. General
 (1)  This section has these procedures:
 (a)  Clean the fuel tank
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737-300/400/500MAINTENANCE MANUAL
 (b)  
Look for structural corrosion

 (c)  
Look for damage to the fuel tank sealant or the corrosion resistant finish.

 CAUTION: DO NOT USE DETERGENTS TO REMOVE FUNGUS FROM THE TANK SURFACES.
_______ THEY WILL CAUSE THE MICROBES AND THE FUNGUS TO INCREASE IN OTHER LOCATIONS.
 (2)  
The fuel tanks can have corrosion caused by fungus and microbes. The fungus and microbes are in hydrocarbon fuels, and they become attached to the bottom surfaces of the tanks. You can remove the fungus from the tank surfaces with a fiber brush and water. You can also use a steam cleaner. If you use a steam cleaner, it helps to remove the fuel fumes. It also helps you to find the loose or deteriorated finish. The steam cleaner causes the badly bonded finish to come off.

 (3)  
While the tanks are wet with fuel, the fungus is a black, smooth, moist material. When the tanks are dry, the fungus is a solid material on the tank surfaces. The solid material can have a light brown color when it is dry. If there is fungus, it is usually in the bottom lower panel of the wing. You can also find fungus in the areas adjacent to the bottom panel where the water collects. Fungus can possibly add to the corrosion of the structure. If you find some corrosion, refer to the Structural Repair Manual.

 (4)  
You can find the drain holes and the drain tubes through the wing stringers. They let the sump fuel and the water drain to the lowest areas of the wing tanks. You must keep the holes and tubes clear of material. This will prevent the collection of the fuel and the water when you drain the tanks (Fig. 701).

 B. Standard Tools and Equipment
 (1)  
Brush - wire, hand-held

 (2)  
Brush - wire, rotary, stainless steel

 (3)  
Gloves - Asbestos, Jackson Products, Warren, Michigan, or equivalent
　
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