W DOC AIRBUS | AMM A320F

Repair of Titanium-Alloy Hydraulic Tubes with HARRISON Sleeves and Unions

TASK 20-23-11-300-005-A
Repair of Titanium-Alloy Hydraulic Tubes with HARRISON Sleeves and Unions

1. Reason for the Job
NOTE: This procedure is applicable to:
  • Titanium-alloy (Ti-3Al-2.5V) tubes ref. ABS5004, sizes -04 to -16.
NOTE: This repair procedure is not applicable to:
  • Hydraulic tubes in the engine area
  • Hydraulic tubes in the pylon box structure
  • Hydraulic tubes in the fuel tanks
  • Coiled tubes
  • Hydraulic tubes installed on the landing gear legs.
NOTE: It is not permitted to use separable fittings in pressurized areas.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
SWAGING TOOL HARRISON - ROLLER
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.03HBD9)
Synthetic Ester base Grease-General Purpose Low Temp -
(Material No.08BAA9)
Non Aqueous Cleaner-General - -
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 12-12-29-611-001-A
Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 12-12-29-611-002-A
Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart
TASK 20-23-11-917-003-A
Cutting and Deburring of Hydraulic Tubes
TASK 29-00-00-870-001-A
Bleeding Procedure of the Green Hydraulic System Upstream of the Engine Pump
TASK 29-00-00-870-002-A
Bleeding Procedure of the Green Hydraulic System Upstream of the PTU
TASK 29-00-00-870-003-A
Bleeding Procedure of the Green Hydraulic System Downstream of the Engine Pump
TASK 29-00-00-870-004-A
Bleeding Procedure of the Yellow Hydraulic System Upstream of the Engine Pump
TASK 29-00-00-870-005-A
Bleeding Procedure of the Yellow Hydraulic System Upstream of the PTU
TASK 29-00-00-870-006-A
Bleeding Procedure of the Yellow Hydraulic System Upstream of the Yellow E-Pump
TASK 29-00-00-870-007-A
Bleeding Procedure of the Yellow Hydraulic System Downstream of the Engine Pump
TASK 29-00-00-870-008-A
Bleeding Procedure of the Blue Hydraulic System Upstream of the Blue E-Pump
TASK 29-00-00-870-009-A
Bleeding Procedure of the Blue Hydraulic System Downstream of the Blue E-Pump
TASK 29-10-00-863-001-A
Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-002-A
Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-003-A
Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-003-A-01
Pressurize the Blue Hydraulic System with the Blue Electric Pump
TASK 29-14-00-614-002-A
Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01
Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
TASK 29-23-00-863-001-A
Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
TASK 29-23-00-863-002-A
Pressurize the Yellow Hydraulic System from the Green Hydraulic System through the PTU with the Ground Service Cart
TASK 32-42-00-870-001-A
Bleeding of the Normal Braking at the Brake Units
TASK 32-43-00-612-001-A
Filling and Bleeding of the Low Pressure Control System of the Alternate Braking
TASK 32-43-00-612-001-A-01
Filling and Bleeding of the Low Pressure Control System of the Alternate Braking using Green Reservoir fluid
TASK 32-43-00-870-002-A
Bleeding of the High Pressure Alternate Braking System
F Connection of Tubes with HARRISON Fittings
F Tube Protrusion and Tube Growth
F Minimum Length of Straight Tube for Swaging
F Tube End Dimension
F Dimension Acceptance Criteria for ASN-3759 Sleeves
F Dimension Acceptance Criteria for ASN-3760 Unions
F Internal Swage (Expander Tools)
F External Swage Tools for Sleeves
F External Swage Tools for Unions
F Tool Installation
F Torque Values for Pressure Tests
3. Job Set-up
Subtask 20-23-11-917-070-A
A. General
   (1) This approved repair procedure permits to repair hydraulic tubes in TI 3AL 2.5 V titanium alloy.
NOTE: This repair procedure uses a tube swaging method by internal rolling. It is not applicable to corrosion-resistant steel or aluminum-alloy tubes.
   (2) The use of HARRISON sleeve and union permits to make a separable connection between two tubes or between a tube and a system component.
   (3) The unions, sleeves and sleeve nuts applicable for this repair procedure are:
   (4) To repair the tube with HARRISON sleeve and union, you must:
  • Cut the tube and remove the damaged section,
  • Square and deburr the ends of the tubes,
  • Clean the tubes,
  • Install the sleeve nut, the sleeve and the union on the tubes,
  • Swage the tubes into the sleeve and the union,
  • Connect the ends of the tubes with the sleeve, the nut and the union.
NOTE: You must remove the tube to swage it.
   (5) You must use the applicable SWAGING TOOL HARRISON - ROLLER to swage the tube.
4. Procedure
Subtask 20-23-11-917-068-A
A. Preparation of the Tube
   (1) Tube cutting and deburring
     (a) determine the tube length and take into account the tube protrusion from the sleeve D and the tube growth after swaging delta L,
F Tube Protrusion and Tube Growth
     (b) make sure that the length of the straight section of the tube immediately after the bent section is the minimum necessary for the swaging operation.
F Minimum Length of Straight Tube for Swaging
NOTE: If the damaged section is too large or too near a bend, you can replace the damaged section by another tube.
In this case, you must use two HARRISON fittings.
     (c) Cut the tube and remove the damaged section: (Ref. AMM TASK 20-23-11-917-003)
  • Make sure that the tube ends have no burrs (inner and outer side).
    Deburr if necessary.
    F Tube End Dimension
   (2) Clean the tube with Non Aqueous Cleaner-General - - (Material No.08BAA9) and blow air through the tube to remove all swarf and impurities.
   (3) Accurately measure the tube thickness. Write this value to do the check of the swage.
   (4) Make sure that the tube thickness is in the permitted tolerance (E).
F Dimension Acceptance Criteria for ASN-3759 Sleeves
F Dimension Acceptance Criteria for ASN-3760 Unions
Subtask 20-23-11-917-071-A
B. Preparation of the Swage Tools
   (1) Make sure that the roller swage machine is in this configuration:
  • Power switch OFF,
  • Calibration switch on RUN,
  • Jaw select switch on RELEASE,
  • Thumb wheel switch on O.O.O.,
  • Swage machine clear of swage tools and other items,
  • Air pressure source 5.6 bar (81.2211 psi) min. connected to the swage machine,
  • Electrical power supply connected to the swage machine.
   (2) Do a trial run at no load:
     (a) Put the power switch in the ON position.
     (b) Put the jaw select switch in the LOCK position.
     (c) Push the power on button and make sure that:
  • The motor runs in the counterclockwise direction,
  • The mandrel feed is in the full back position,
  • The torque shown is 3.60.
     (d) Push the swage button and make sure that:
  • The motor runs in the clockwise direction,
  • The mandrel feed moves forward.
     (e) Push the RESET button and make sure that all the above functions go back to their initial position.
   (3) Put the power switch in the OFF position.
   (4) Put the jaw select switch on RELEASE.
NOTE: Make sure that you have done the check of the swage tools for conformity.
Make sure that the maintenance and calibration periodicity of the roller swage machine is not exceeded.
   (5) Determine the expander tool to swage the tubes on the sleeve and the union.
F Internal Swage (Expander Tools)
NOTE: The same expander tool is used for the sleeve and the union.
   (6) Determine the external tools applicable:
   (7) Install the external tools on the housing of the swage machine.
   (8) Install the expander tool on the swage machine as follows:
  • Remove the cover from the housing assembly,
  • Put the expander tool on the housing,
  • Engage the mandrel square-drive shank into the quick-disconnect coupling,
  • Install the cover on the housing assembly.
   (9) Lubricate the rollers of the expander tool with Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) .
     (a) Pull the expander tool mandrel to the rear.
     (b) Put the grease through the hole of the cage with a grease hand pump with a V-shaped nozzle.
The grease must flow out of the cage openings.
     (c) Remove the old grease which may contain titanium particles.
NOTE: You must lubricate the rollers before each swaging operation.
NOTE: After approximately 30 swages, you must fully clean the rollers, the cage and the mandrel with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
Subtask 20-23-11-917-069-A
C. Swage the Tube
F Tool Installation
   (1) Make a visual inspection of the tube I.D. to make sure that there are no scratches.
   (2) Put the sleeve (or union) and the tube in position into the external swage tools.
   (3) Push the tube fully in and close the two half jaws.
   (4) Put the power switch in the ON position.
   (5) Put the jaw switch on LOCK.
   (6) Adjust the swaging torque as a function of the tube diameter, with the three thumb wheels.
TUBE DIA. mm
TUBE DIA. in.
SWAGE TORQUE
6.35
1/4
006
9.52
3/8
015
12.70
1/2
026
15.87
5/8
045
19.05
3/4
047
25.40
1
084
NOTE: The torque values shown are in lbf.in.
They are the same for the sleeves and unions.
   (7) Push the swage button and make sure that this sequence occurs:
  • The mandrel turns clockwise,
  • The expander moves forward into the tube,
  • The mandrel moves forward and expands the rollers,
  • When you get the set swage torque values (after 15 to 20 seconds), the motor stops, the mandrels turns counterclockwise then moves to the rear,
  • The expander moves to the rear,
  • The cycle is completed.
   (8) Put the jaw switch on RELEASE.
   (9) Open the half jaws and remove the tube from the swage tool.
   (10) Carefully clean the tube with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
Subtask 20-23-11-917-067-A
D. Do the Check of the Swage
   (1) Measure the diameter A, B and C and make sure that they obey the dimension acceptance criteria.
F Dimension Acceptance Criteria for ASN-3759 Sleeves
F Dimension Acceptance Criteria for ASN-3760 Unions
NOTE: You must calculate the permitted min. and max. dia. C as a function of the actual thickness of the tube before swaging.
NOTE: In all cases, you cannot re-swage.
   (2) Make sure that there are no scratches or other damage on the seal areas between sleeve and union.
   (3) Make sure that there are no scratches or roller marks on the tube I.D.
NOTE: A helical extrusion mark in the G area (due to tube wall growth during swaging) or a rubbing mark in the H area (due to swage tool cage rubbing) is permitted.
   (4) Connect the HARRISON sleeve and union of the tubes and TORQUE it to the normal test value.
F Torque Values for Pressure Tests
5. Close-up
Subtask 20-23-11-860-063-A
A. Put the Aircraft back to its Initial Configuration
   (1) Pressurize the hydraulic reservoirs (Ref. AMM TASK 29-14-00-614-002).
   (2) If necessary, fill the hydraulic reservoirs:
   (3) Pressurize the hydraulic systems for 15 minutes:
   (4) Make sure that there is no leakage in the repaired area.
     (a) If there is a leakage, slowly and continuously increase the torque value to the maximum approved (maximum test value) until you stop the leak.
   (5) Bleed the related hydraulic system:
     (a) For the Green system:
     (b) For the Yellow system:
     (c) For the Blue system:
     (d) For the normal braking system (Ref. AMM TASK 32-42-00-870-001).
     (e) For the alternate braking system:
   (6) Make sure that the work area is clean and clear of tools and other items.
[Rev.10 from 2021] 2026.04.01 04:47:13 UTC
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