20-10-51
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 D. Procedure
 S 948-236
 (1)  
Remove pressure from the system where you will do the repair.

 S 358-237

 (2)  
Use the tools (Fig. 837) contained in swager, RTSK8-02-006.

 S 358-238

 (3)  
Cut out the damaged section of the tube using a chipless tube cutter (Fig. 804) and the following:

 (a)  
Make sure the section you cut out of the tube is a straight section with a minimum straight length as shown in (Fig. 812). This will make sure the fitting and the swage tool will fit.

 (b)  
Use one Rynglok union for the repair if the damaged section is not longer than the dimensions listed in (Fig. 805). If the damage is within the dimensions, the cut can be through the center of the damaged section.

 S 158-239
 (4)  
Remove the paint and the anodize from the tubes to the dimensions shown in (Fig. 812).

 S 118-240

 (5)  
Clean the non-painted tube sections that you will repair with alcohol, MIL-E-51454, Type II.

 S 398-241

 (6)  
Use a brush to apply coating, MIL-C-81706, MIL-C-5541, Type II to the cut ends of the tube.

 S 628-242

 (7)  
Seal the tube ends with a cap if you do not join the tubing
 immediately.

 S 948-243

 (8)  
Apply positioning and inspection marks on the tube to be repaired using the appropriate gage from the swager, RTSK8-02-006 and a Sanford Sharpie (or equivalent) felt tip pen with a fine or extra fine point (Fig. 837,838). Bottom the gage on the cut edge of the tube before making the marks.

 (9)  
Move the Rynglok union over the tube ends.

 S 948-245

 (10)
 Put the edge of the fitting ring over the center of the positioning mark (nominaltube insertion) as shown in (Fig. 839). The edge of the fitting ring may be anywhere along the length of the positioning mark but the nominal position is recommended.

 S 948-244
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 368-246

 WARNING:_______ MAKE SURE YOU MAKE NO PUMP ADJUSTMENT THAT CAN CAUSE THE SWAGE
 TOOL HYDRAULIC PRESSURE TO BE OUTSIDE THE MANUFACTURER'S
 RECOMMENDATIONS.  THE AEROQUIP RECOMMENDATION FOR THE TOOL IS
 8000 PSI TO 8500 PSI MAXIMUM.  IF PRESSURE IS GREATER THAN THIS
 VALUE, INJURY AND DAMAGE CAN OCCUR.

 (11) Swage the union to the tube as shown in the Aeroquip Installation Guide supplied with the swager, RTSK8-02-006.
 NOTE: The fitting must always be fully installed in the tool to
____ maximize tool life.
 S 368-247
 (12)
 Examine the finished installation for correct ring advancement using the appropriate size inspection gage from the swager, RTSK8-02-006. The inspection gage should fit over the ring area as shown in (Fig. 840) so that the ring is flush with the center portion of the union.

 S 948-248

 (13)
 Pressurize the hydraulic system to operating pressure for the system which was repaired.

 S 368-249

 (14)
 Examine the tube-to-union interface for hydraulic leakage.  If leakage is found, the union must be cut out and a tube repair by section replacement must be done.

 S 378-250

 (15)
 Apply coating, MIL-C-81706, MIL-C-5541, Type II to bare areas of the aluminum tubing where paint was removed, followed by a coat of primer, BMS10-11, Type I.

 TASK 20-10-51-358-251
 11. Repair Hydraulic Tubing With Flexible Hoses___________________________________________
 A. General
 (1)  The Boeing Company recommends that the operator do these procedures:
 (a)  
Make a record of the flexible hoses that you install as temporary repairs for rigid lines.

 (b)  
Make a schedule for the regular inspection of flexible hose installations. Make sure the installation stays an airworthy repair until the system is put back to its initial configuration.
　
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