TASK 38-11-00-143-080
 4.  Manually Clean the Potable Water Tank_____________________________________
 A. General
 (1)  This task is used to manually clean the potable water tank. This should only be used when the disinfecting task is not effective. This task only cleans the water tank, not the entire potable water system. The normal process for maintenance of the potable water system is Potable Water System Disinfect Procedure, AMM 38-11-00/301.
 B. Equipment
 (1)  
Water service cart

 (2)  
Soft bristle brush with handle

 (3)  
Gloves

 (4)  
Utility knife

 (5)  
Soft mallet

 C. Consumable Materials
 (1)  
G00022 Chemical - Water purifying Chlorine Dioxide (stabilized 2% solution)

 (2)  
B00637 - Citric (Crystals or powder)

 (3)  
B00402 - Cleaning Compound, MIL-C-87936

 D. References
 (1)  
AMM 12-14-00/301, Potable Water System

 (2)  
AMM 38-41-00/201, Potable Water System - Depressurization

 E. Access
 (1)  Location Zone
 166 Area Aft of Aft Cargo Compartment

 F. Procedure
 S 683-093
 (1)  
Drain the potable water system (AMM 12-14-00/301).

 S 683-092

 (2)  
To release the pressure from the potable water system, do this task: Potable Water System - Depressurization (AMM 38-41-00/201).

 S 013-094

 (3)  
Remove the access panel on the aft bulkhead in the aft cargo compartment.

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 38-11-00
 ALL  ú ú 07 Page 308 ú Nov 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Water Tank Cleaning
Figure 301

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 38-11-00
 ALL  ú ú 01 Page 309 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
L84005
A 737-300/400/500MAINTENANCE MANUAL
 S 013-095
 (4)  Do these steps to gain access to the inside of the water tank:
 WARNING: DEPRESSURIZE WATER TANK BEFORE OPENING TANK END CAP.
_______ IF THE TANK END CAP SNAP RING IS REMOVED PRIOR TO TANK DEPRESSURIZATION, THE TANK END CAP CAN INJURE MAINTENANCE PERSONEL.
 CAUTION: DO NOT INSERT MORE THAN 0.25 INCH OF THE KNIFE INTO THE
_______ INSULATION COVER. IF THE DEPTH OF THE CUT IS MORE THAN
 0.25 INCH, YOU CAN DAMAGE THE POTABLE WATER TANK.
 (a)  
To access each end cap, make two cuts, one horizontal and one vertical, into the insulation material near the center of each of the tank end caps.

 (b)  
Move the insulation cover to the side.

 (c)  
On each end cap, compress the snap ring and remove from the end cap, Figure 301.

 (d)  
Pull the end caps from the tank.

 S 673-096
 (5)  Mix a disinfectant solution as follows:
 (a)  
Mix 19 fluid ounces (0.57 liter) chlorine dioxide with 2.00 ounces (56.6 grams) of citric acid in a 5 gallon (20 liter) plastic container.

 (b)  
Mix thoroughly with a clean instrument.

 (c)  
Let stand for 5 minutes to activate.

 (d)  
Add clean water to make 4 or 5 gallons of solution (16 to 20 liters).

 S 673-097
 (6)  
Put the mixture into the water tank.

 S 113-102

 (7)  
Clean the inside of the tank with a soft bristle brush.

 (8)  
Drain the tank (AMM 38-11-00/301).

 S 163-101

 (9)  
Mix 16 fluid ounces (0.5 liter) of detergent and 2.5 gallons (10 liters) of water in a 5 gallon (20 liter) plastic container.

 (10)
 Put the mixture into the water tank.

 (11)
 Clean the inside of the tank and caps with a soft bristle brush.

 S 683-103
 S 113-104
 S 143-105
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