DOC AIRBUS | AMM A320FMarking of the Unions after Application of Standard or Specific Tightening Torque
TASK 20-23-22-910-001-A
Marking of the Unions after Application of Standard or Specific Tightening Torque
After you tighten a union on a line or a pipe or a hose, you must identify it with a painted line:
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Referenced Information
3. Job Set-up
Subtask 20-23-22-869-050-A
Subtask 20-23-22-918-050-A
Subtask 20-23-22-869-051-A
[Rev.10 from 2021]
2026.03.31 22:59:42 UTC
Marking of the Unions after Application of Standard or Specific Tightening Torque
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the JobAfter you tighten a union on a line or a pipe or a hose, you must identify it with a painted line:
- This is to identify a tightened union
- This is to show possible loosening of the union.
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 2 | PAINTBRUSH |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.04SAB2) | Varnish Polyurethane-- Marking Structure |
| (Material No.08BAA9) | Non Aqueous Cleaner-General - - |
| (Material No.12ACB1) | Corrosion Preventive Compound-Heavy Duty Hard Film - |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| REFERENCE | DESIGNATION |
|---|---|
Example of Marking of UnionsSubtask 20-23-22-869-050-A
A. System Configuration
(1) Before you do this procedure, make sure that:
(a) You have tightened the related union to the applicable torque value.
(b) You have done the applicable leakage test.
4. Procedure(1) Before you do this procedure, make sure that:
(a) You have tightened the related union to the applicable torque value.
(b) You have done the applicable leakage test.
Subtask 20-23-22-918-050-A
A. Marking of the Unions in the Hydraulic System
(1) Use a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) to clean the surfaces on which you will make marks.
The Airbus recommended color is the red color. If the red color is not available, apply a different color included in the Consumable Material List (CML) that has a good contrast with the union color.
(4) Apply Corrosion Preventive Compound-Heavy Duty Hard Film - (Material No.12ACB1) on the cadmium-plated steel unions.
Subtask 20-23-22-918-054-A (1) Use a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) to clean the surfaces on which you will make marks.
NOTE: If you install components again, it is necessary to remove the remaining painted line before you paint a new line.
(2) Paint one line with a width of 2 mm (0.0787 in.) to 4 mm (0.1575 in.) on the union with the PAINTBRUSH and Varnish Polyurethane-- Marking Structure (Material No.04SAB2) . The Airbus recommended color is the red color. If the red color is not available, apply a different color included in the Consumable Material List (CML) that has a good contrast with the union color.
NOTE: The union marking is not applicable in the fuel tanks.
(3) Let it dry. (4) Apply Corrosion Preventive Compound-Heavy Duty Hard Film - (Material No.12ACB1) on the cadmium-plated steel unions.
B. Marking of the Unions for Pneumatic Sense Line
(1) Use a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) to clean the surfaces on which you will make marks.
The Airbus recommended color is the red color. If the red color is not available, apply a different color included in the CML that has a good contrast with the union color.
Subtask 20-23-22-918-055-A (1) Use a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) to clean the surfaces on which you will make marks.
NOTE: If you install components again, it is necessary to remove the remaining painted line before you paint a new line.
(2) Paint one line with a width of 2 mm (0.0787 in.) to 4 mm (0.1575 in.) on the union with the PAINTBRUSH and Varnish Polyurethane-- Marking Structure (Material No.04SAB2) . The Airbus recommended color is the red color. If the red color is not available, apply a different color included in the CML that has a good contrast with the union color.
NOTE: It is permitted to make a mark on the unions in the fuel tanks if sealant applied on these unions. It is not permitted to make a mark on the unions directly touch the fuel.
(3) Let it dry. C. Marking of the Unions in the Oxygen System
(1) Use a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) to clean the surfaces on which you will make marks.
The Airbus recommended color is the red color. If the red color is not available, apply a different color included in the CML that has a good contrast with the union color.
5. Close-up(1) Use a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) to clean the surfaces on which you will make marks.
NOTE: If you install components again, it is necessary to remove the remaining painted line before you paint a new line.
(2) Paint one line with a width of 2 mm (0.0787 in.) to 4 mm (0.1575 in.) on the union with the PAINTBRUSH and Varnish Polyurethane-- Marking Structure (Material No.04SAB2) . The Airbus recommended color is the red color. If the red color is not available, apply a different color included in the CML that has a good contrast with the union color.
NOTE: The union marking is not applicable in the fuel tanks.
(3) Let it dry. Subtask 20-23-22-869-051-A
A. Make sure that the work area is clean and clear of tools and other items.