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 Subtask 20-23-22-869-050
 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_________
 (Ref. Fig. 201/TASK 20-23-22-991-001)
 Subtask 20-23-22-918-050
 A. Hydraulic Systems
 (1) Clean the surfaces to be marked with CLEANING AGENTS (Material No. 11-003).
 NOTE : If you install components again, you must remove the old red____ line before you apply a new red line. 
R R R R R  (2) Make a mark on the union with one 2 mm (0.0787 in.) to 4 mm (0.1574 in.) wide line with STRUCTURE PAINTS (Material No. 16-003) or STRUCTURE PAINTS (Material No. 16-018) or PAINTS FOR DETAIL (INTERNAL AND EXTERN AL) (Material No. 07-020) (red color) applied with a brush. Let dry. 
R R R  NOTE : If you make a mark with PAINTS FOR DETAIL (INTERNAL AND EXTERN____ AL) (Material No. 07-020) on hydraulic unions, you must use a polyurethane lacquer.
 (3) Apply STORAGE PRESERVATION (Material No. 15-008) on cadmium-plated steel union.

 

 Example of Marking of Unions
 Figure 201/TASK 20-23-22-991-001
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 Subtask 20-23-22-918-051

 B. Crew Oxygen System
 (1) Clean the surface to be marked with CLEANING AGENTS (Material No. 11-005).
 NOTE : If you install components again, you must remove the old red____ line before you apply a new red line. 
R R R R  (2) Make a mark on the union with one 2 mm (0.0787 in.) to 4 mm (0.1574 in.) wide line with STRUCTURE PAINTS (Material No. 16-003) or PAINTS FOR DETAIL (INTERNAL AND EXTERN AL) (Material No. 07-020) (red color) applied with a brush. Let dry.
 5. Close-up________
 Subtask 20-23-22-869-051
 A. Make sure that the work area is clean and clear of tool(s) and other items.

 

 INSTALLATION AND REPAIR OF WATER AND AIR SUPPLY TUBING - MAINTENANCE PRACTICES
______________________________________________________________________________
 TASK 20-23-38-000-001
 Removal of the Tubes of the Potable Water and the Air Supply System
 NOTE : The procedure is the same for both the potable 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 blanking plugs
 No specific chipless cutter
 No specific container
 No specific warning notice

 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
12-24-38-680-001  Draining of the Potable Water System (with Electrical Power)
 20-23-38-300-001  Repair of the Tubes Assembly of the Potable Water and the Air Supply System to be carried out in the Workshop
 20-23-38-300-002 Repair of the Tubes of the Potable Water and the Air Supply System to be carried out in the Aircraft R 20-23-38-300-048 Repair of the Tubes with H-Fittings to be carried out in the Aircraft 20-23-38-300-049 Temporary Repair of the Tube Assemblies with MS21922 Sleeves to be carried out in the Workshop 24-42-00-861-001 Energize the Ground Service Network from the External Power 30-73-53-000-001 Removal of the Potable-Water De-icing Heater Elements
 (4DW, 5DW, 6DW, 9DW)
 38-10-00-614-002 Depressurization of the Potable Water System
 20-23-38-991-015 Fig. 201
 20-23-38-991-037 Fig. 202
 20-23-38-991-004 Fig. 203

 

 3. Job Set-up
__________ Subtask 20-23-38-861-053
 A. Energize the ground service network
 (Ref. TASK 24-42-00-861-001)

 Subtask 20-23-38-010-061
 B. Get Access
 (1) Remove/open the relevant access panels/doors to get access to the repair area.
 Subtask 20-23-38-860-059
 C. Aircraft Maintenance Configuration
 (1)
 Make sure that the water system is the depressurized before maintenance action (Ref. TASK 38-10-00-614-002).

 (2)
 Make sure that the potable water system is emptied before maintenance action (Ref. TASK 12-24-38-680-001).
　
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