W DOC AIRBUS | AMM A320F

Installation of the Tube Assembly of the Potable Water and the associated Air Supply System

TASK 20-23-38-400-003-A
Installation of the Tube Assembly of the Potable Water and the associated Air Supply System

WARNING: DO NOT DO WORK ON THE TOILET WASTE SYSTEM AND THE POTABLE WATER SYSTEM AT THE SAME TIME. THIS WILL PREVENT CONTAMINATION OF THE POTABLE WATER SYSTEM. SUCH CONTAMINATION CAN BE DANGEROUS TO HEALTH.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
NOTE: The procedure is the same for both the potable water and the air supply system.
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
2
TIE WRAP(S)
No specific
Torque wrench: range to between 0.15 and 0.12 m.daN (13.27 and 10.62 lbf.in ) T
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.03PEB1)
Lubricant-Rubber seal Glycerin -
(Material No.06AAB1)
Polysulfide Sealant-General Purpose Fillet -
(Material No.06PAG1)
Adhesion Promoter-For Polysulfide Sealant - -
(Material No.14DAB1)
Release Agent-- Water Base -
No specific
Tape NSA 0141-16A
No specific
Tape NSA 0141-25A
 C. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
4
TEE HALF BOX
AIPC 38-12-01-01-250
9
SEAL
AIPC 38-12-01-01-252
4
TEE HALF BOX
AIPC 38-12-01-01-256
4
TEE HALF BOX
AIPC 38-12-01-10-220
9
SEAL
AIPC 38-12-01-10-252
4
TEE HALF BOX
AIPC 38-12-01-10-256
4
TEE HALF BOX
AIPC 38-12-01-11-190
4
TEE HALF BOX
AIPC 38-12-01-11-220
4
TEE HALF BOX
AIPC 38-12-01-11-230
4
TEE HALF BOX
AIPC 38-12-01-11-236
4
TEE HALF BOX
AIPC 38-12-01-11-240
4
TEE HALF BOX
AIPC 38-12-01-11-250
9
SEAL
AIPC 38-12-01-11-252
4
TEE HALF BOX
AIPC 38-12-01-11-256
 D. Referenced Information
REFERENCE
DESIGNATION
TASK 12-15-38-613-001-A
Fill the Potable Water Tank System (Aircraft Electrical Power Available)
TASK 12-24-38-680-001-A
Draining of the Potable Water System (with Electrical Power)
TASK 20-21-12-911-001-A
Tightening Torques for Pipe Unions (not for OXYGEN Unions)
TASK 20-28-00-912-802-A
Electrical Bonding - General Maintenance Procedure
TASK 24-42-00-862-001-A
De-energize the Ground Service Network Supplied from the External Power
TASK 30-73-53-400-001-A
Installation of the Potable-Water De-icing Heater Elements
TASK 38-10-00-614-001-A
Pressurization of the Potable Water System from a Ground Air Supply
TASK 38-10-00-614-002-A
Depressurization of the Potable Water System
TASK 38-10-00-614-003-A
Pressurization of the Potable Water System with the Compressor
TASK 38-10-00-670-002-A
Disinfection of Potable Water System and Discard of Water Filter Elements, if Installed
TASK 38-41-00-790-001-A
Leak Check of the Components in the Air Supply System
F Connection of a (two) Tube(s) with Fittings
F Permissible Tube Depth - Stainless-Steel Tube Material
F Tubes with a Flexible Coupling
F Protection Hoses
F Tee Half Box
3. Job Set-up
Subtask 20-23-38-860-058-A
A. Aircraft Maintenance Configuration
   (1) Make sure that the water system is depressurized before maintenance action (Ref. AMM TASK 38-10-00-614-002).
   (2) Make sure that the potable water system is empty before maintenance action (Ref. AMM TASK 12-24-38-680-001).
4. Procedure
Subtask 20-23-38-410-059-A
A. Installation of the Tubing with HARRISON Sleeves and Fittings
F Connection of a (two) Tube(s) with Fittings
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. This will prevent subsequent removal of the tubing.
   (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 PLUG-BLANKING from each disconnected line end.
   (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.
F Permissible Tube Depth - Stainless-Steel Tube Material
   (6) Make sure that the tubes for the potable water are correctly identified Tape NSA 0141-25A.
   (7) Make sure that the tubes for the air supply system are correctly identified Tape NSA 0141-16A.
NOTE: Discard tubes that have indentations with a depth of more than 0.05 mm (0.0020 in.). Two causes are possible for these indentations:
  • A torque value that was too high during installation.
  • Installation and removal too many times.
   (8) Apply Lubricant-Rubber seal Glycerin - (Material No.03PEB1) on the thread of the tubes.
   (9) Put the tubing in position.
   (10) Make sure that the electrical bonds are correct (Ref. AMM TASK 20-28-00-912-802).
   (11) Torque the connections to the applicable values (Ref. AMM TASK 20-21-12-911-001).
NOTE: Airbus recommends to torque the connections only if the swivel nuts are installed manually without resistance and decrease the torque by 25% at the critical connections.
   (12) Install the potable-water de-icing heater elements:
Subtask 20-23-38-410-062-A
B. Installation of the Tube Assembly Fitted with Flexible Couplings (ABS0395)
F Tubes with a Flexible Coupling
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 items of equipment are installed in the correct position. This will prevent subsequent removal of the tubes (1) and (3).
   (2) Make sure that there is the minimum clearance between the tubes (1) and (3) and the other components (tubes, flexible hoses, structure, etc).
   (3) Make sure that a CONTAINER - CLEAN, APPLICABLE is in position below the potable water line to collect the unwanted water.
   (4) Make sure that the tubes (1) and (3) are in the correct condition.
   (5) Remove the PLUG - BLANKING from the disconnected line end(s).
   (6) Put the new O-rings (5) in position on the flanges (2) of the tubes (1) and (3).
   (7) Make sure that the O-rings (5) are not twisted.
   (8) Apply a thin layer of Lubricant-Rubber seal Glycerin - (Material No.03PEB1) on the O-rings (5).
NOTE: This is:
  • For the smooth installation of the sleeve (6).
  • To prevent contamination of the potable water.
   (9) Make sure that the minimum distance D1 between the flanges (2) of the tubes (1) and (3) is 6.35 mm (0.25 in.).
   (10) Apply Lubricant-Rubber seal Glycerin - (Material No.03PEB1) on the inner side of the sleeve (6).
   (11) Make sure that the ends of the tubes (1) and (3) are correctly aligned.
   (12) Install one end of the sleeve (6) on the tube (1) and the second end of the sleeve (6) on the tube (3).
   (13) Make sure that the sleeve (6) is installed in the correct position on the ends of the tubes (1) and (3).
CAUTION: MAKE SURE THAT EACH CLAMP IS CORRECTLY LOCKED. IF A CLAMP IS NOT CORRECTLY LOCKED, IT CAN OPEN SUDDENLY AND A LEAK CAN OCCUR.
   (14) Install and lock the clamp (4) on the sleeve (6).
NOTE: If you hear a click, this is not an indication that the clamp (4) is correctly closed.
   (15) Make sure that the locking system of the clamp (4) is correctly engaged.
   (16) If removed, install the heater bridges on the tubes (1) and (3).
   (17) If removed, install the potable-water de-icing heater-elements (Ref. AMM TASK 30-73-53-400-001).
   (18) If removed, install insulation packs on the tubes (1) and (3).
Subtask 20-23-38-410-063-A
C. Installation of the Protection Hose Assembly
F Protection Hoses
   (1) Make sure that all the items of equipment are installed in the correct position. This will prevent subsequent removal of the tubes (6) and (8).
   (2) Make sure that a CONTAINER - CLEAN, APPLICABLE is in position below the potable water line to collect the unwanted water.
   (3) Make sure that the clamp (7) is correctly engaged. If not, do the step 4.B. again.
   (4) Move the protection hoses (1) and (4) sufficiently to install the straight half shells (3).
   (5) Put the straight half shells (3) in position around the clamp (7).
   (6) Move the protection hoses (1) and (4) along the tubes (6) and (8) to put a cover on the straight half shells (3).
   (7) Install the clamps (5) on the protection hoses (1) and (4) with the clamp screws (2).
   (8) TORQUE the clamp screws (2) to between 0.15 and 0.12 m.daN (13.27 and 10.62 lbf.in ) T.
Subtask 20-23-38-410-064-A
D. Installation of the Tee Half Boxes
F Tee Half Box
   (1) Make sure that all items of equipment are installed.
   (2) Make sure that you do not remove the pipe assemblies (5), (7) and (8).
   (3) Make sure that the CONTAINER - CLEAN, APPLICABLE is in position below the potable water line to collect the unwanted water.
   (4) Make sure that the pipes attached with the flexible couplings (ABS0395) are correctly engaged. If the pipes are not correctly engaged, go to Paragraph 4.B.
   (5) Before you install the tee half boxes (4), apply Release Agent-- Water Base - (Material No.14DAB1) to the pipe assemblies (5), (7) and (8).
   (6) Select the applicable new tee half boxes (4):
   (7) If the tie wraps (1) are not used to attach the tee half boxes (4), apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) and Adhesion Promoter-For Polysulfide Sealant - - (Material No.06PAG1) on the edges of the tee half boxes (4).
   (8) If the tie wraps (1) are used to attach the tee half boxes (4):
     (a) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) on the edges of the tee half boxes (4).
     (b) Install the new AIPC 38-12-01-01-252 SEAL (9) or AIPC 38-12-01-10-252 SEAL (9) or AIPC 38-12-01-11-252 SEAL (9) on the edges of the tee half boxes (4).
   (9) Let the sealants cure.
   (10) Put the tee half boxes (4) in their correct installation positions around the tee (6).
   (11) Install the clamps (3) on the tee half boxes (4).
   (12) Tighten the screws (2) of the clamps (3).
   (13) If applicable, install the new TIE WRAP(S) (1).
5. Close-up
Subtask 20-23-38-790-051-A
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. AMM TASK 12-15-38-613-001).
     (c) Pressurize the potable water system (Ref. AMM TASK 38-10-00-614-001) or (Ref. AMM TASK 38-10-00-614-003).
     (d) Examine the repaired tubing for leaks.
   (2) If there is leakage, slowly 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 CONTAINER - CLEAN, APPLICABLE.
     (b) Install the potable-water de-icing heater elements as necessary:
   (3) Do the Leak Check of the Air Supply Lines
     (a) Examine the repaired air tubing for leaks . (Ref. AMM TASK 38-41-00-790-001)
     (b) If there is leakage, slowly and continuously increase the torque value to the maximum authorized (maximum test value) until you stop the leak.
NOTE: Leaks are not permitted.
Subtask 20-23-38-410-060-A
B. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Install/close the removed/opened access panels/doors.
Subtask 20-23-38-670-056-A
C. Do the Sterilization of the Potable Water System (Ref. AMM TASK 38-10-00-670-002).
Subtask 20-23-38-862-051-A
D. De-energize the Ground Service Network (Ref. AMM TASK 24-42-00-862-001).
[Rev.10 from 2021] 2026.04.01 04:49:59 UTC
"Aviabrain" 2025