Example of Marking of Unions 
 Figure 201/TASK 20-23-22-991-001 
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 1CES  1
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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