W DOC AIRBUS | AMM A320F

Temporary Repair of the Tube Assemblies with MS21922 Sleeves to be carried out in the Workshop

TASK 20-23-38-300-049-A
Temporary Repair of the Tube Assemblies with MS21922 Sleeves to be carried out in the Workshop

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. Consumable Materials
REFERENCE
DESIGNATION
(Material No.03LBB1)
Grease-Thread Anti-seize Graphited and Petrolatum -
(Material No.08BAA9)
Non Aqueous Cleaner-General - -
 B. Referenced Information
REFERENCE
DESIGNATION
TASK 20-23-38-000-001-A
Removal of the Tube 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
F Repair Procedure with a MS Sleeve
F Repair of a Straight Tube Section
F Repair of a Union
F Repair of a Tube End
F Repair of an Elbow
F Chipless Cutter
F Table and Operation of Deburring Tool
F Initial Torque Values/Torque Values for the Nuts MS21921
F Table of Torque Values for Pressure Test
3. Job Set-up
Subtask 20-23-38-010-055-A
A. Remove the Tube Assembly for Repair (Ref. AMM TASK 20-23-38-000-001)
Subtask 20-23-38-941-059-A
B. General
   (1) Temporary repair with MS21922 sleeve.
F Repair Procedure with a MS Sleeve
     (a) This temporary repair is applicable only for corrosion-resistant steel tubes.
     (b) Do not use MS21922 sleeves for permanent repairs. These sleeves are for temporary repairs (no more than 2500 flight hours). Complete this procedure with the applicable permanent repair procedure:
  • repair of the tubes with PERMASWAGE fittings,
  • repair of the tubes with HARRISON unions and sleeves,
  • repair of the tubes with SIERRACIN/HARRISON H-fittings.
     (c) You can use MS sleeves to do repairs on tubes that have MS33514 or MS33515 fittings. No special tools are necessary. The subsequent separation of joints with MS sleeves is possible.
4. Procedure
Subtask 20-23-38-320-059-A
A. Repair with a MS21922 Sleeve
   (1) Determine the length of tube to be cut as a function of the location of the damaged area.
F Repair of a Straight Tube Section
F Repair of a Union
F Repair of a Tube End
F Repair of an Elbow
NOTE: If you must use another tube to repair the damaged area, use a rigid tube of the same type as the tube to be repaired, if possible.
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.
   (2) Cut the tube.
Cut and deburr the inner and outer diameters of the ends of the tubes.
F Chipless Cutter
F Table and Operation of Deburring Tool
   (3) Clean the Tube
WARNING: WHEN YOU USE COMPRESSED AIR:
  • USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
  • DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.
LOOSE PARTICLES AND/OR HIGH PRESSURE AIR CAN CAUSE INJURY.
WARNING: WHEN YOU USE COMPRESSED AIR:
  • USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
  • DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.
LOOSE PARTICLES AND/OR HIGH PRESSURE AIR CAN CAUSE INJURY.
     (a) Clean the end of the tube with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
     (b) Blow air through the tube to remove all swarf and other foreign material.
   (4) Install the fitting.
     (a) Put the nut and the sleeve on the tube.
NOTE: Make sure that the cutting edge of the sleeve points to the end of the tube.
     (b) Lubricate with Grease-Thread Anti-seize Graphited and Petrolatum - (Material No.03LBB1) :
NOTE: No grease permitted in the tube.
  • the threads and the contact face of the nut,
  • the threads of the union.
     (c) Put the end of the tube into the fitting.
   (5) Do the Swaging
F Initial Torque Values/Torque Values for the Nuts MS21921
     (a) Hold the tube against the shoulder of the union and tighten the nut fully with your hand.
     (b) From this position, tighten the nut to swage the sleeve (obey the number of turns for the nut).
   (6) Do a check of the tube joint.
     (a) Loosen the nut and examine the swaging of the sleeve:
  • there must be a small bulge between the cutting edge and the contact shoulder of the nut,
  • the surface of the sleeve must be smooth (there must be no cracks or surface defects),
  • the end of the sleeve must not be flat (the nut must move freely along the sleeve).
     (b) Install the lines. Use the specified torque values (refer to the table).
F Initial Torque Values/Torque Values for the Nuts MS21921
NOTE: You must use these torque values each time that you assemble the tubes.
   (7) Clean the Tube
   (8) Clean the end of the tube with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
5. Close-up
Subtask 20-23-38-780-053-A
A. Do the Pressure Test of the Tube
   (1) Connect the HARRISON sleeve and union of the tube and TORQUE it to the normal value.
F Table of Torque Values for Pressure Test
   (2) Pressurize the tube to an operational pressure.
   (3) If there is leakage, slowly and continuously increase the torque value to maximum authorized (maximum test value) until you stop the leak.
   (4) Make sure that there is no leakage.
NOTE: Leakage is not permitted.
Subtask 20-23-38-410-055-A
B. Install the Repaired/New Tube (Ref. AMM TASK 20-23-38-400-003)
[Rev.10 from 2021] 2026.03.31 22:59:47 UTC
"Aviabrain" 2025