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747-400 MAINTENANCE MANUAL
S 128-417
(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 118-418
(5) Rub or rinse the tubing with solvent, Series 88 (AMM 20-30-88/201) to remove all the residue.
S 318-419
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 438-422
(11)
Install the repaired fuel tube per applicable maintenance manual procedure.
BAC 5975, Class A, using 4043 filler rod. .
(7) S 238-433Penetrant check welded area (SOPM 20-20-02).
(8) S 118-434Rinse with solvent, Series 88 (AMM 20-30-88/201).
(9) S 798-420Hydrostatically test required tube to 240 psig per BAC5001-2. shall be no leakage. There
S 378-421
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747-400
MAINTENANCE MANUAL
WRINKLE MEASUREMENTS
Permitted Ovality and Wrinkle of Hydraulic and Fire Extinguishing Tube Bends
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L07622
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747-400
MAINTENANCE MANUAL
OPERATING PRESSURE SYSTEM OD TUBE MATERIAL TUBE ALLOWABLE HEIGHT (Inches) WRINKLE 1 Specified OD)* (Percent of ALLOWABLE OVALITY
3000 PSI 1000 PSI To (Including Return Lines) Liquid: All Sizes Stainless Steel 0.010 5
Aluminum 0.010 5
3AL-2.5V Titanium Visible None 3
or Pressure Above 1500 PSI Temperature Above 160F Pneumatic And Oxygen: All Sizes Stainless Steel 0.010 5
or Pressure Less Than 1000 PSI Pressure Less Than 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
Less Than 2.0 1.0 Or Over, Stainless Steel 0.060 10
Aluminum Alloy & Copper 0.030 10
Less Than 3.0 2.0 Or Over, 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)
L07702
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