(b)
Install the potable-water de-icing heater elements as necessary (Ref. TASK 30-73-53-400-001).
(3) Do a leak check of the air supply items.
(a)
Examine the repaired air tubing for leaks (Ref. TASK 38-41-00-790-001).
(b)
If there is leakage, slowely and continuously increase the torque value to the maximum authorized (maximum test value) until you stop the leak. (Ref. Fig. 217/TASK 20-23-38-991-026)
NOTE : Leaks are not permitted.
____
5. Close-up
________
Subtask 20-23-38-410-054
A. Close Access
(1) Close all the access doors/panels opened for repair.
Subtask 20-23-38-670-053
B. Do the Sterilisation of the Potable Water Tank and Distribution System (Ref. TASK 38-10-00-670-002) (Potable Water System).
Subtask 20-23-38-862-050
C. De-energize the Ground Service Network (Ref. TASK 24-42-00-862-001)
TASK 20-23-38-300-049
Temporary Repair of the Tube Assemblies with MS21922 Sleeves to be carried out in the Workshop
NOTE : The procedure is the same for both the potable water and the air supply
____ system.
1.
Reason for the Job
__________________
Self Explanatory
2.
Job Set-up Information
______________________
A. Consumable Materials
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. 04-003 USA MIL-T-5544 GRAPHITED PETROLATUM THREAD COMPOUND (Ref. 20-31-00) Material No. 11-003 USA ASTM D 740 METHYL-ETHYL-KETONE (Ref. 20-31-00)
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
20-23-38-000-001
R 20-23-38-400-003
20-23-38-991-004
20-23-38-991-005
20-23-38-991-027
20-23-38-991-040
20-23-38-991-041
20-23-38-991-042
20-23-38-991-043
20-23-38-991-044
20-23-38-991-045
3. Job Set-up
__________
Subtask 20-23-38-010-055Removal of the Tubes of the Potable Water and the Air Supply System Installation of the Tubes Assembly of the Potable Water and Air Supply SystemFig. 203Fig. 207Fig. 218Fig. 230Fig. 231Fig. 232Fig. 233Fig. 234Fig. 235
A. Remove the Tube Assembly for Repair (Ref. TASK 20-23-38-000-001)
Subtask 20-23-38-941-059
B. General
(1) Temporary repair with MS21922 sleeve.
(Ref. Fig. 230/TASK 20-23-38-991-040)
(a)
This temporary repair is applicable only for corrosion-resistant steel tubes.
(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:
R - repair of the tubes with PERMASWAGE fittings,
-
repair of the tubes with HARRISON unions and sleeves,
-
repair of the tubes with SIERRACIN/HARRISON H-fittings.
(c) You can use MS sleeves to do repairs on tubes that have MS33514 or MS33515 fittings. No special tools are necessary. The subsequent separation of joints with MS sleeves is possible.
4. Procedure
_________
Subtask 20-23-38-320-059
A. Repair with a MS21922 Sleeve
(1) Determine the length of tube to be cut as a function of the location of the damaged area. (Ref. Fig. 231/TASK 20-23-38-991-041, 232/TASK 20-23-38-991-042, 233/TASK 20-23-38-991-043, 234/TASK 20-23-38-991-044)
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.
(2) Cut the tube.
WARNING : MAKE SURE THAT THE EQUIPMENT YOU USE FOR THIS PROCEDURE IS
_______ CLEAN AND APPROVED FOR THE POTABLE WATER SYSTEM. IF NOT IT CAN CAUSE CONTAMINATION OF THE POTABLE WATER SYSTEM.
Cut and deburr the inner and outer diameters of the ends of the
tubes.
(Ref. Fig. 203/TASK 20-23-38-991-004, 207/TASK 20-23-38-991-005)
Repair Procedure with a MS Sleeve
Figure 230/TASK 20-23-38-991-040
1EFF : ALL 1 20-23-38 Page 267
1 1 May 01/98
1 1
1CES 1
Repair of a Straight Tube Section
Figure 231/TASK 20-23-38-991-041
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