20-10-51
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A
737-300/400/500MAINTENANCE MANUAL
j) Rotate the deburring tool until the inside burr is removed.
k) Remove the tool with the plug expanded. The expanded plug should remove particles from the inside of the tube.
NOTE: Make sure you do not drop metal particles in
____ area of the repair.
3) Swage the necessary flareless BACS13BX sleeves to the repair tube using the applicable section: Swage BACS13BX Flareless Sleeves with the Harrison Elastomer Swagers 5175, 5570, 5720.
4) Assemble and tighten the flareless fittings which are part of the repair section (AMM 20-10-51/401).
5) Measure all of the tube assembly length with BACS13BX sleeves (L1) (Figs. 806, 809).
6) To find the necessary cutout length (L2) as shown in (Figs. 806, 809), use the procedure given in (Fig. 810) for BACS13BX sleeves and Harrison Portable Swagers with MS21902 unions.
7) Remove the pressure from the systems where you will do the repairs.
8) Cut out the damaged tube (L2). Trim the tube ends as shown in (Fig. 804).
9) When you make the installation, refer to the section: "Swage the BACS13BX Flareless Sleeves with the Harrison Elastomer Swagers 5175, 5570, 5720".
10) Install the repair section and tighten the nuts (AMM 20-50-11/201).
TASK 20-10-51-208-260
13. Aluminum Fuel Tubes - Temporary Weld Repair Method
__________________________________________________
A. General
CAUTION: REPLACE THE TUBE THAT HAS A TEMPORARY REPAIR WITH A NEW SECTION
_______ OF TUBE WITHIN A MAXIMUM OF 250 FLIGHT HOURS. IF YOU DO NOT REPLACE THE TUBE, DAMAGE COULD OCCUR.
(1) This is a temporary repair method approved for 6061 and 5052 aluminum fuel system tubing, and is applicable only to tubes with wear-through damage, cracks, or punctures.
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20-10-51
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737-300/400/500MAINTENANCE MANUAL
(2)
Repair is accomplished with tubing removed from airplane.
B.
Consumable Materials
(1)
B01000 Solvent, Series 80
(2)
B01008 Solvent, Series 88
C.
Aluminum Fuel Tube Repair
S 018-261
(1) Remove aluminum fuel tube to be repaired by referring to applicable maintenance manual removal and installation procedure.
S 118-262
CAUTION:_______FULLY CLEAN THE TUBING. IF YOU DO NOT CLEAN THE TUBING, THE WELD CAN GET CONTAMINATED AND THE WELD QUALITY DECREASES.
(2)
Completely clean the inner and outer surfaces of all the tube section with solvent, Series 80 (AMM 20-30-80/201).
S 358-263
(3)
If tubing is cracked, drill 3/32-inch stop holes at each end of crack.
S 128-264
(4)
Clean tubing use wire brush to descale and remove all protective coatings and oxides from area to be welded.
NOTE: Wire brushes used for descaling must have bristles of
____ austenitic corrosion-resistant steel or nickel-silver.
S 118-265
(5) Rub or rinse the tubing with solvent, Series 88 (AMM 20-30-88/201) to remove all the residue.
S 318-266
CAUTION: MAKE SURE THERE IS NOT TOO MUCH PRESSURE IN THE TUBING DURING
_______ THE WELDING. A HIGH PRESSURE CAN CAUSE A BAD WELD BEAD CONFIGURATION.
(6) Fusion weld the damaged area by a gas tungsten arc process.
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