W DOC AIRBUS | AMM A320F

Repair of the Tubes with H-Fittings to be carried out in the Aircraft

TASK 20-23-38-300-048-A
Repair of the Tubes with H-Fittings to be carried out in the Aircraft

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
1
CONTAINER - CLEAN, APPLICABLE
No specific
AR
CUTTER - ROLLER TYPE, CHIPLESS
No specific
AR
TOOL - DEBURRING
No specific
AR
WARNING NOTICE(S)
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.08BAA9)
Non Aqueous Cleaner-General - -
 C. 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 24-42-00-861-001-A
Energize the Ground Service Network from the External Power
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 38-10-00-670-002-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 Chipless Cutter
F Table and Operation of Deburring Tool
F Usual Repair Procedures
F Part Numbers and Dimensions of a Fitting
F Fitting Installation
F Table of Dimensions Acceptane Criteria for NSA 855034P Unions
3. Job Set-up
Subtask 20-23-38-861-052-A
A. Energize the ground service network (Ref. AMM TASK 24-42-00-861-001)
Subtask 20-23-38-010-054-A
B. Get Access
   (1) Open/remove the relevant access panels/doors to get access to the repair area.
Subtask 20-23-38-860-055-A
C. Aircraft Maintenance Configuration
   (1) Make sure that the water system is the depressurized before maintenance action (Ref. AMM TASK 38-10-00-614-002).
   (2) Make sure that the potable water system is emptied before maintenance action (Ref. AMM TASK 12-24-38-680-001).
Subtask 20-23-38-941-058-A
D. Safety Precautions
WARNING: MAKE SURE THAT THE POTABLE WATER SYSTEM IS DEPRESSURIZED. A PRESSURIZED SYSTEM CAN CAUSE INJURY TO PERSONS WHEN THEY DO WORK ON IT.
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.
   (1) Put a WARNING NOTICE(S) in position to tell personnel not to fill or pressurize the potable water system.
4. Procedure
Subtask 20-23-38-941-061-A
A. Put a CONTAINER - CLEAN, APPLICABLE below the potable water line to collect the unwanted water.
Subtask 20-23-38-350-052-A
B. Removal of the Damaged Tube Section
WARNING: MAKE SURE THAT THE WATER TANK IS DEPRESSURIZED.
WARNING: MAKE SURE THAT THE POTABLE WATER SYSTEM IS DEPRESSURIZED. A PRESSURIZED SYSTEM CAN CAUSE INJURY TO PERSONS WHEN THEY DO WORK ON IT.
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.
   (1) Cut and Deburr the Damaged Tubing
     (a) Use a CUTTER - ROLLER TYPE, CHIPLESS and a TOOL - DEBURRING
F Chipless Cutter
F Table and Operation of Deburring Tool
NOTE: The maximal distance between the ends of the tube is 6.36 mm (0.25 in.).
Subtask 20-23-38-320-058-A
C. Tube Repair Procedure
NOTE: The H-fitting is approved for the permanent repair of middle line tubes when:
  • the applicable swaging equipment or other special tools are not available,
  • there must be an immediate repair (this repair procedure is faster than other repair procedures).
    There are four different types of repair procedures
    F Usual Repair Procedures
    Use the applicable fitting (refer to the H-fitting Dimension and Part Number Table).
    F Part Numbers and Dimensions of a Fitting
    Each fitting is supplied in a plastic bag which also contains a positioning template and tape.
   (1) Installation procedure for SIERRACIN/HARRISON H-fittings.
F Fitting Installation
NOTE: You can repair defects or chafing areas that are less than or equal to 9.52 mm (0.37 in.). across. You must splice defects that are larger. The minimum dimension that you can splice is 114.3 mm (4.50 in.).
     (a) Carefully clean the ends of the tube with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
Make sure that the tube I.D. and O.D. are clean.
     (b) Use the template to find the position of the tape (2) on the tube at from 14.22 +0.5 -0 mm (0.56 +0.02 -0.00 in.) the end of the tube.
     (c) Find the tube insertion mark at 36.6 +0 -0mm (1.44 +0.00 0.00 in.) from the other end of the tube.
     (d) Put the nut (1), the union (2), the coupling (3) and the slide (4) in the correct sequence in position on the tube.
     (e) Move on only one layer of tape (5). Cut off the unwanted tape.
     (f) Put the union (2) in position against the tape (5).
     (g) Engage the slide (4) on the tube. The rounded end of the slide must be against the union (2).
     (h) Engage the nut (1) on the slide (4) side.
     (i) Engage the coupling (3) on the union (2) side.
     (j) Engage the nut (1) in the coupling (3) and tighten it with the union (2) against the tape (5).
     (k) Hold the coupling end (3).
NOTE: Do not turn the coupling (3).
     (l) Tighten the nut (1) until you feel resistance. This occurs when the slide (4) and the coupling (3) close tightly against the union (2).
     (m) Make sure that you can see the insertion mark on the tube.
     (n) Remove the nut (1). Make sure that the slide (4) and the coupling (3) are between 3.8 mm (0.15 in.) and 0 mm (0.00 in.) from the shoulder of the union. If not, tighten the nut (1) until the slide (4) and the coupling (3) are in the correct position.
     (o) The union (2) must touch the tape (5).
     (p) The edge of the coupling (3) must be across the mark on the tube.
     (q) Tighten the assembly to complete the swaging procedure.
Subtask 20-23-38-790-054-A
D. Do the Leak Check of the Repaired Tube.
   (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).
     (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.
F Table of Dimensions Acceptane Criteria for NSA 855034P Unions
NOTE: Leaks are not permitted.
     (a) Remove the container.
     (b) Install the potable-water de-icing heater elements as necessary:
   (3) Do a leak check of the air supply items.
     (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.
F Table of Dimensions Acceptane Criteria for NSA 855034P Unions
NOTE: Leaks are not permitted.
5. Close-up
Subtask 20-23-38-410-054-A
A. Close Access
   (1) Close all the access doors/panels opened for repair.
Subtask 20-23-38-670-053-A
B. Do the Sterilisation of the Potable Water Tank and Distribution System (Ref. AMM TASK 38-10-00-670-002) (Potable Water System).
Subtask 20-23-38-862-050-A
C. De-energize the Ground Service Network (Ref. AMM TASK 24-42-00-862-001)
[Rev.10 from 2021] 2026.03.31 22:59:46 UTC
"Aviabrain" 2025