(2)
C00064 Coating, Surface Treatment (Alodine) - MIL-C-81706,
MIL-C-5541, Type II MIL-C-5541, Type II
(3)
C00259 Primer, chemical and solvent resistant finish, epoxy resin primer - BMS10-11, Type I
D. Procedure
S 948-389
(1)
Remove pressure from the system where you will do the repair.
S 358-390
(2)
Use the tools (Fig. 837) contained in swager, RTSK8-02-006.
S 358-391
(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 158-392
(4)
Remove the paint and the anodize from the tubes to the dimensions shown in (Fig. 812).
S 118-393
(5)
Clean the non-painted tube sections that you will repair with alcohol, MIL-E-51454, Type II.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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A
747-400
MAINTENANCE MANUAL
S 398-394
(6)
Use a brush to apply coating, MIL-C-81706, MIL-C-5541, Type II to the cut ends of the tube.
S 628-395
(7)
Seal the tube ends with a cap if you do not join the tubing immediately.
S 948-396
(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.
S 948-397
(9)
Move the Rynglok union over the tube ends.
S 948-398
(10)
Put the edge of the fitting ring over the center of the positioning mark (nominal tube 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 368-399
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 368-400
(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. 841) so that the ring is flush with the center portion of the union.
S 948-401
(13)
Pressurize the hydraulic system to operating pressure for the system which was repaired.
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A
747-400 MAINTENANCE MANUAL
S 368-402
(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 378-403
(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.
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