DOC AIRBUS | AMM A320FTemporary Repair of Hydraulic Tubes
TASK 20-23-11-300-004-A
Temporary Repair of Hydraulic Tubes
1. Reason for the Job
This task gives the permitted temporary repair procedures for hydraulic tubes or flexible hoses.
A. Consumable Materials
B. Referenced Information
3. Job Set-up
Subtask 20-23-11-917-065-A
Subtask 20-23-11-917-066-A
Subtask 20-23-11-860-064-A
[Rev.10 from 2021]
2026.04.01 04:47:18 UTC
Temporary Repair of Hydraulic Tubes
1. Reason for the Job
This task gives the permitted temporary repair procedures for hydraulic tubes or flexible hoses.
NOTE: Temporary repair with MS21922 sleeve
This procedure is applicable to:
This procedure is applicable to:
- Corrosion-resistant steel (21-6-9) tubes ref. ASNA3288, sizes -04 to -24
- Aluminum-alloy (6061-T6) tubes ref. ASNA3410 and DAN40, sizes -04 to -16 and -24.
NOTE: Temporary repair of a tube with a flexible hose
This procedure is applicable to:
This procedure is applicable to:
- Titanium-alloy (Ti-3Al-2.5V) tubes ref. ABS5004, sizes -04 to -16
- Corrosion-resistant steel (21-6-9) tubes ref. ASNA3288, sizes -04 to -24
- Aluminum-alloy (6061-T6) tubes ref. ASNA3410 and DAN40, sizes -04 to -16 and -24.
NOTE: It is not permitted to do a temporary repair on:
2. Job Set-up Information- Coiled tubes
- Hydraulic tubes or hydraulic flexible hoses installed on/in the:
. Engine area
. Pylon box structure
. Pylon forward secondary structure
. Fuel tanks
. Landing gear legs.
A. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.02ABA1) | Phosphate Ester Hydraulic Fluid-General Power - - |
| (Material No.08BAA9) | Non Aqueous Cleaner-General - - |
| 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 20-23-14-910-001-A | Protection of Hydraulic Lines from Vibration and Chafing |
| 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 |
Repair Procedure with an MS SleeveSubtask 20-23-11-917-065-A
A. General
(a) This temporary repair is applicable only for hydraulic tubes in 21-6-9 corrosion-resistant steel or 6061-T6 aluminum alloy.
(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:
(2) General rules for temporary repair with flexible hose
(a) You can connect a temporary-repair flexible hose to:
4. ProcedureNOTE: Separable fittings are not allowed in pressurized areas.
(1) Temporary repair with MS21922 sleeve. (a) This temporary repair is applicable only for hydraulic tubes in 21-6-9 corrosion-resistant steel or 6061-T6 aluminum alloy.
(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 hydraulic tubes with PERMASWAGE fittings,
- Repair of the hydraulic tubes with HARRISON sleeves and unions,
- Repair of the hydraulic tubes with SIERRACIN/HARRISON H-fittings.
(2) General rules for temporary repair with flexible hose
(a) You can connect a temporary-repair flexible hose to:
- A pipe or a flexible hose
- A fixed equipment
- An equipment that can have different positions.
Refer to paragraph 4.B. and 4.C.
- It is connected to a fixed or mobile equipment
- If there is a temporary repair on other hydraulic system(s).
Refer to paragraph 4.B. and 4.C.
- After the first flight or two flight cycles
- During the life limit period.
Refer to paragraph 4.B. and 4.C.
Subtask 20-23-11-917-066-A
A. Repair with an MS 21922 Sleeve
(1) Determine the length of tube to be cut as a function of the location of the damaged area.
Cut and deburr the inner and outside diameters of the ends of the tubes.
(3) Clean the end of the tube with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(4) Install the fitting.
(a) Put the nut and the sleeve on the tube.
(5) Do the swaging.
(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:
Subtask 20-23-11-917-064-A (1) Determine the length of tube to be cut as a function of the location of the damaged area.
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. If you use a flexible hose for the repair, refer to the temporary repair procedure of tubes with flexible hoses (this procedure is in this task).
(2) Cut the tube. Cut and deburr the inner and outside diameters of the ends of the tubes.
(3) Clean the end of the tube with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(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 Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) or Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) : - The threads and the mating face of the nut,
- The threads of the union.
(5) Do the swaging.
(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 mating 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).
NOTE: You must use these torque values each time that you assemble the tubes.
B. Flexible Hose Temporary-Repair for Replacement of a Fixed Pipe or a Fixed Flexible Hose
(1) Installation conditions
(a) A temporary repair with a flexible hose is permitted on two hydraulic systems if there is no hydraulic line temporary-repair on the third hydraulic system.
(b) A temporary repair with two or more flexible hoses end-to-end is permitted if:
(2) Operational conditions
(a) One temporary repair
2 Replace the temporary repair (flexible hose) with a permanent repair at 1000 flight hours or 750 flight cycles (the one that comes first).
3 Do an inspection of the flexible hose temporary-repair to make sure that it is in the correct condition:
3 Do an inspection of the flexible hose temporary-repair to make sure that it is in the correct condition:
(a) If possible, attach the flexible hose to an adjacent pipe or other hose with tie-wraps and spacers. This is to prevent chafing with the adjacent structure (Ref. AMM TASK 20-23-14-910-001).
Make sure that there is sufficient space for movement of the flexible spare hose.
If there is a risk of chafing between the hose and the structure/component, install a chafe guard on the related section of the hose.
(b) The flexible hose must have an overlength or a curve to make an allowance for length variations caused by pressure.
The hose length changes:
(d) Obey the minimum bend radius of the hose to prevent sharp bends in the hose assembly. Use:
Use swivel connections at one end or at the two ends to prevent distortion stresses.
(f) In all operation conditions, there must be clearance between the hose assemblies and:
(g) When you install the hose assembly supports, make sure that they do not cause distortion of the rigid lines (this can occur when the lines and hoses move in relation to each other). Use the correct number of clamps to make sure that the lines are correctly installed along the contour of the structure. This prevents abrasive wear, kinks and entanglement during flexure. You must install clamps, at a minimum, in the locations where the tube clamps were. You must not attach hoses around their outside diameters with tight, rigid clamps which prevent all movement. Some hoses between rigid connections must move longitudinally. In this condition, use clamps which will not cause wear on the hose casing. You must attach the connections at the tube, not at the hose.
Subtask 20-23-11-917-087-A (1) Installation conditions
(a) A temporary repair with a flexible hose is permitted on two hydraulic systems if there is no hydraulic line temporary-repair on the third hydraulic system.
(b) A temporary repair with two or more flexible hoses end-to-end is permitted if:
- The repair replaces one pipe only (between two pipe connections).
- Only standard fittings are installed between flexible hoses (if necessary).
NOTE: The below table is only applicable for the flexible hoses temporary repairs. Others repairs method (by MS21922 sleeve or welding), are independent.
| | SYSTEM 1 | SYSTEM 2 | SYSTEM 3 | |||
|---|---|---|---|---|---|---|
| Allowed | 1 | 1000 FH/750 FC | 0 | NA | 0 | NA |
| | 2 (or more) | 20 FC (for each repairs) | 0 | NA | 0 | NA |
| | 1 | 20 FC | 1 | 20 FC | 0 | NA |
| | 2 (or more) | 20 FC (for each repairs) | 1 | 20 FC | 0 | NA |
| Not Allowed | 1 (or more) | NA | 1 (or more) | NA | 1 (or more) | NA |
| | 2 (or more) | NA | 2 (or more) | NA | 0 | NA |
(a) One temporary repair
NOTE: i.e. one temporary repair on one system, and no temporary repairs on the others systems (refer to the above table).
1 The maximum life limit-period is 1000 flight hours or 750 flight cycles (the one that comes first). 2 Replace the temporary repair (flexible hose) with a permanent repair at 1000 flight hours or 750 flight cycles (the one that comes first).
3 Do an inspection of the flexible hose temporary-repair to make sure that it is in the correct condition:
- After two flight cycles.
- Each week.
NOTE: Refer to the above table for the allowed/not allowed repair number.
1 The maximum life limit-period is 20 flight cycles. NOTE: When the permanent repair(s) replace(s) the temporary repair(s), the FC limitation for remaining temporary repair (if one is remaining), comes back to 1000FH/750FC. Its limitation starting point is the temporary repair installation.
2 Replace the temporary repair (flexible hose) with a permanent repair at 20 flight cycles. 3 Do an inspection of the flexible hose temporary-repair to make sure that it is in the correct condition:
- After two flight cycles.
- Each day.
- At minimum, be applicable for the operation pressure in the system
- Be applicable for the type of fluid in the system
- Have a nominal size that is the same as or larger than the size of the damaged tube
- Have a sufficient length to replace the damaged tube or the damaged part of the tube.
(a) If possible, attach the flexible hose to an adjacent pipe or other hose with tie-wraps and spacers. This is to prevent chafing with the adjacent structure (Ref. AMM TASK 20-23-14-910-001).
Make sure that there is sufficient space for movement of the flexible spare hose.
If there is a risk of chafing between the hose and the structure/component, install a chafe guard on the related section of the hose.
(b) The flexible hose must have an overlength or a curve to make an allowance for length variations caused by pressure.
The hose length changes:
- From +2 to -2.9% for a moderate pressure
- From +2 to -2% for a high pressure.
(d) Obey the minimum bend radius of the hose to prevent sharp bends in the hose assembly. Use:
- Elbow fittings
- Hoses with elbow-type end fittings.
Use swivel connections at one end or at the two ends to prevent distortion stresses.
(f) In all operation conditions, there must be clearance between the hose assemblies and:
- The other lines
- The adjacent structure
- The equipment.
| HOSE CLEARANCE TO | MINIMUM CLEARANCE (INCH) |
|---|---|
| CONTROL CABLES AND LINKAGES | 1.0 |
| CABLE AT PULLEYS | 0.5 |
| CABLE AT MIDDLE OF SPAN | 2.0 |
| ELECTRICAL WIRING | 0.5 |
| HYDRAULIC TUBES OR HOSES | 0.2 |
NOTE: When the lines have rigid tubes, it is necessary to wind Teflon tape around the hose after protection.
(5) If necessary for repair, install the applicable fittings on the ends of the tubes to connect the flexible hose assembly. Obey the installation rules related to the flexible hoses. Make sure that the fittings that you will install on the tubes are compatible with the fittings on the flexible hose assembly. For installation of sleeve MS21922, refer to the repair procedure with an MS21922 sleeve in this task. C. Flexible Hose Temporary-Repair Replacement of a Pipe or a Flexible Hose Connected to a Mobile Part or a Mobile Equipment
(1) Installation conditions
(a) A temporary repair with a flexible spare hose is permitted on two hydraulic systems if there is no hydraulic line temporary-repair on the third hydraulic system.
(b) A temporary repair with two or more flexible hoses end-to-end is permitted if:
(a) Maximum life limit period: 20 flight cycles
(b) Replace the temporary repair by a permanent repair after 20 flight cycles.
(c) Do an inspection of the flexible hose temporary repair to make sure that it is in the correct condition
(a) If possible, attach the flexible spare hose to an adjacent pipe or other hose with ty-wraps and spacers (Ref. AMM TASK 20-23-14-910-001) to prevent chafing with the adjacent structure.
Make sure that there is sufficient space for movement of the flexible spare hose. If there is a risk of chafing between the hose and the structure/component, install a chafe guard on the related part of the hose.
(b) The flexible spare hose must have an overlength or a curve to make an allowance for length variations caused by pressure.
The hose length changes:
(d) Obey the minimum bend radius of the hose.
To prevent sharp bends in the hose assembly, use:
(f) In all operation conditions, during the full movement, there must be clearance between the hose assemblies and:
(g) When you install the hose assembly supports, make sure that they do not cause distortion of the rigid lines (this can occur when the lines and hoses move in relation to each other). Use a correct number of clamps to get correct routing of the lines along the contour of the structure. This prevents abrasive wear, kinks and entanglement during flexure. You must install clamps, at a minimum, at locations where the tube clamps were. You must not attach hoses around their outside diameters with tight, rigid clamps which prevent all movement. Some hoses between rigid connections must move longitudinally. For these hoses, use clamps which will not cause wear on the hose casing. You must attach the connections at the rigid part, not at the hose.
5. Close-up(1) Installation conditions
(a) A temporary repair with a flexible spare hose is permitted on two hydraulic systems if there is no hydraulic line temporary-repair on the third hydraulic system.
(b) A temporary repair with two or more flexible hoses end-to-end is permitted if:
- The repair replaces one flexible hose only,
- Only standard fittings are installed between the flexible spare hoses (if necessary).
(a) Maximum life limit period: 20 flight cycles
(b) Replace the temporary repair by a permanent repair after 20 flight cycles.
(c) Do an inspection of the flexible hose temporary repair to make sure that it is in the correct condition
- After the first flight,
- Then every day.
- At minimum, be specified for use with the operation pressure in the system
- Be specified for use with the type of fluid used in the system
- Have a nominal size that is the same as or larger than the size of the damaged flexible hose or pipe
- Have sufficient length to replace the damaged flexible hose or pipe.
(a) If possible, attach the flexible spare hose to an adjacent pipe or other hose with ty-wraps and spacers (Ref. AMM TASK 20-23-14-910-001) to prevent chafing with the adjacent structure.
Make sure that there is sufficient space for movement of the flexible spare hose. If there is a risk of chafing between the hose and the structure/component, install a chafe guard on the related part of the hose.
(b) The flexible spare hose must have an overlength or a curve to make an allowance for length variations caused by pressure.
The hose length changes:
- From +2 to -2.9% for a moderate pressure
- From +2 to -2% for a high pressure.
(d) Obey the minimum bend radius of the hose.
To prevent sharp bends in the hose assembly, use:
- Elbow fittings,
- Hose with elbow-type end fittings.
(f) In all operation conditions, during the full movement, there must be clearance between the hose assemblies and:
- The other lines,
- The adjacent structure,
- The equipment.
Hose minimum clearances must be as follows:
| HOSE CLEARANCE TO | MINIMUM CLEARANCE (INCH) |
|---|---|
| CONTROL CABLES AND LINKAGES | 1.0 |
| CABLE AT PULLEYS | 0.5 |
| CABLE AT MIDDLE OF SPAN | 2.0 |
| ELECTRICAL WIRING | 0.5 |
| HYDRAULIC TUBES OR HOSES | 0.2 |
NOTE: When the lines have rigid tubes, you must wind Teflon tape around the hose after protection.
(5) If necessary for repair, install the applicable fittings on the ends of the tubes to connect the flexible hose assembly. Obey the installation rules related to the flexible hoses. Make sure that the fittings to be installed on the tubes can be used with the fittings on the flexible hose assembly. For installation of MS21922 sleeve, refer to the repair procedure with an MS21922 sleeve in this task. Subtask 20-23-11-860-064-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:
(5) Bleed the related hydraulic system:
(a) For the Green system:
(e) For the alternate braking system:
(1) Pressurize the hydraulic reservoirs (Ref. AMM TASK 29-14-00-614-002).
(2) If necessary, fill the hydraulic reservoirs:
- With a hand pump (Ref. AMM TASK 12-12-29-611-001) or
- With a hydraulic cart (Ref. AMM TASK 12-12-29-611-002).
- For the Green system (Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001)
- For the Yellow system (Ref. AMM TASK 29-10-00-863-002) or (Ref. AMM TASK 29-23-00-863-002)
- For the Blue system (Ref. AMM TASK 29-10-00-863-003).
(5) Bleed the related hydraulic system:
(a) For the Green system:
- Upstream of the engine pump (Ref. AMM TASK 29-00-00-870-001)
- Upstream of the Power Transfer Unit (PTU) (Ref. AMM TASK 29-00-00-870-002)
- Downstream of the engine pump (Ref. AMM TASK 29-00-00-870-003).
- Upstream of the engine pump (Ref. AMM TASK 29-00-00-870-004)
- Upstream of the PTU (Ref. AMM TASK 29-00-00-870-005)
- Upstream of the Yellow E-pump (Ref. AMM TASK 29-00-00-870-006)
- Downstream of the engine pump (Ref. AMM TASK 29-00-00-870-007).
- Upstream of the Blue E-pump (Ref. AMM TASK 29-00-00-870-008)
- Downstream of the Blue E-pump (Ref. AMM TASK 29-00-00-870-009).
(e) For the alternate braking system:
- Low pressure (if installed) (Ref. AMM TASK 32-43-00-612-001)
- High pressure (Ref. AMM TASK 32-43-00-870-002).