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S 358-355
(3)
If tubing is cracked, drill 3/32-inch stop holes at each end of crack.
S 128-356
(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 118-357
(5) Rub or rinse the tubing with solvent, Series 88 (AMM 20-30-88/201) to remove all the residue.
S 318-358
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 per
(10)
Finish repaired area with appropriate protective coatings as required to meet original tube finish requirements.
S 438-361
(11)
Install the repaired fuel tube per applicable maintenance manual procedure.
BAC 5975, Class A, using 4043 filler rod.
(7) S 238-362Penetrant check welded area (SOPM 20-20-02).
(8) S 118-363Rinse with solvent, Series 88 (AMM 20-30-88/201).
(9) S 798-359Hydrostatically test repaired tube to 240 psig per BAC5001-2. shall be no leakage. There
S 378-360
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MAINTENANCE MANUAL
RADIAL WRINKLE LONGITUDINAL WRINKLE
WRINKLE HEIGHT
WRINKLE MEASUREMENTS
Permitted Ovality and Wrinkle of Hydraulic and Fire Extinguishing Tube Bends
Figure 801 (Sheet 1)
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OPERATING PRESSURE SYSTEM OD TUBE MATERIAL TUBE HEIGHT (Inches) WRINKLE ALLOWABLE 1 (Percent of Specified OD)* ALLOWABLE OVALITY
1000 PSI To 3000 PSI Return Lines) (Including Liquid: All Sizes Stainless Steel 0.010 5
Aluminum 0.010 5
3AL-2.5V Titanium None Visible 3
Pressure Above or 1500 PSI Temperature Above 160F Pneumatic And Oxygen: All Sizes Stainless Steel 0.010 5
or Pressure Less Than Pressure Less Than 1000 PSI Other Liquid Systems: Systems: Than 160F 1500 PSI Temperature Less Pneumatic and Oxygen Less Than 1.0 Stainless Steel 0.040 10
Alloy & Copper Aluminum 0.020 10
1.0 Or Over, Less Than 2.0 Stainless Steel 0.060 10
Aluminum Alloy & Copper 0.030 10
2.0 Or Over, Less Than 3.0 Stainless Steel 0.080 5
Aluminum Alloy & Copper 0.040 5
3.0 Or Over Stainless Steel 0.100 5
Aluminum Alloy & Copper 0.050 5
* Specified Diameter = Drawing Specified Tube Diameter
OD MAX - OD MIN
1 PERCENT (OVALITY) = X 100
OD SPECIFIED*
(NOTE: OD MEASURED IN SAME PLANE).
NOTE: FOR ADDITIONAL INFORMATION ON TUBE BENDING, SEE SAE AIR 5378 "AIRCRAFT TYBE BENDING METHODS, TECHNIQUES AND TOOLING."
Permitted Ovality and Wrinkle of Hydraulic and Fire Extinguishing Tube Bends
Figure 801 (Sheet 2)
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