1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
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REFERENCE QTY DESIGNATION
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No specific NSA 0141-25A
 B. Referenced Information
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REFERENCE DESIGNATION

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12-15-38-613-001 Fill the Potable Water Tank System (Aircraft Electrical Power Available) 12-24-38-680-001 Draining of the Potable Water System (with Electrical Power) 20-21-12-911-001 Tightening Torques for Pipes Unions (not for OXYGEN
 unions) 20-28-00-912-003 Electrical Bonding of Electrical Connectors 24-42-00-862-001 De-energize the Ground Service Network Supplied from
 the External Power 30-73-53-400-001 Installation of the Potable-Water De-icing Heater Elements (4DW, 5DW, 6DW, 9DW) 38-10-00-614-001 Pressurization of the Potable Water System from a
 Ground Air Supply 38-10-00-614-002 Depressurization of the Potable Water System 38-10-00-670-002 Sterilization of Water Tank and Distribution System 38-41-00-790-001 Leak Check of the Components in the Air Supply System 20-23-38-991-015 Fig. 201 20-23-38-991-053 Fig. 236

 3. Job Set-up__________
 Subtask 20-23-38-860-058
 A. Aircraft Maintenance Configuration 
R R  (1) Make sure that the water system is depressurized before maintenance action (Ref. TASK 38-10-00-614-002). 
R R  (2) Make sure that the potable water system is empty before maintenance action (Ref. TASK 12-24-38-680-001).
 4. Procedure_________
 Subtask 20-23-38-410-059
 A. Installation of the Tubing with HARRISON Sleeves and Fittings (Ref. Fig. 201/TASK 20-23-38-991-015)
 WARNING : MAKE SURE THAT THE EQUIPMENT YOU USE FOR THIS PROCEDURE IS_______ CLEAN AND APPROVED FOR THE POTABLE WATER SYSTEM. IF NOT IT CAN CAUSE CONTAMINATION OF THE POTABLE WATER SYSTEM.
 WARNING : MAKE SURE THAT THE POTABLE WATER SYSTEM IS DEPRESSURIZED. A_______ PRESSURIZED SYSTEM CAN CAUSE INJURY TO PERSONS WHEN THEY DO WORK ON IT.
 (1) Make sure that all the equipment items to be connected are in the correct position so that it will not be necessary to remove the tubing subsequently.
 (2) Make sure that you flush the lines before installation, and that the threads of the fittings are clean and in the correct condition.
 (3) Remove the blanking caps.
 (4) Make sure that the tubing ends, the sleeves and the unions are clean and in the correct condition.
 (5) Make sure that the tubes are in the correct condition (Ref. Fig. 236/TASK 20-23-38-991-053)
 (6) Make sure that the tubes are correctly identified NSA 0141-25A.
 NOTE : Discard tubes that have indentations with a depth of more than____ 0.05 mm (0.0019 in.). Two causes are possible for these indentations:

 Permossible Tube Depth - Stainless-Steel Tube Material
 Figure 236/TASK 20-23-38-991-053

 -a torque value that was too high during installation,
 -installation and removal too many times.
 (7)
 Put the tubing in position.

 (8)
 Make sure that the electrical bonds are correct (Ref. TASK 20-28-00-912-003).

 (9)
 Torque the connections to the applicable values (Ref. TASK 20-21-12-911-001).

 (10) Install the potable-water de-icing heater elements (4DW,5DW,6DW,9DW) (Ref. TASK 30-73-53-400-001).
 5. Close-up
________ Subtask 20-23-38-790-051
 A. Do the Leak Check of the Installed Tube Assembly
 (1)
 Do the leak test of the potable water lines.

 (a)
 Remove the warning notice(s).

 (b)
 Fill the potable water system with water (Ref. TASK 12-15-38-613-001)

 (c)
 Pressurize the potable water system (Ref. TASK 38-10-00-614-001)

 (d)
 Examine the repaired tubing for leaks.

 (2)
 If there is leakage, slowely and continuously increase the torque value to the maximum authorized (maximum test value) until you stop the leak.

 NOTE : Leaks are not permitted.
____
 (a)
 Remove the container.

 (b)
 Install the potable-water de-icing heater elements as necessary (Ref. TASK 30-73-53-400-001).

 (3) Do the Leak Check of the Air Supply Lines
　
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