AFS-640

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AFS-640 ( afs-640 )

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9/27/01 AC 43.13-1B CHG 1 A- Minimum Length of Sleeve. B- Streamline Tube Length of Minor Axis. C- Streamline Tube Length of Major Axis. S.L. Size 1” 1-1⁄4 1-1⁄2 1-3⁄4 2 2-1⁄4 2-1⁄2 A 7.324 9.128 10.960 12.784 14.594 16.442 18.268 B .572 .714 .858 1.000 1.144 1.286 1.430 (applicable to wing and C 1.340 1.670 2.005 2.339 2.670 3.008 3.342 tail surface brace struts and other FIGURE 4-43. Streamline tube splice using split sleeve members). b. Replacing weld deposit by chipping out the metal deposited by the welding process and rewelding after properly reinforcing the joint by means of inserts or external gussets. 4-104. STAINLESS STEEL STRUC­ TURE. Repair structural components made from stainless steel, particularly the “18-8” va­ riety (18 percent chromium, 8 percent nickel), joined by spot welding, in accordance with the instructions furnished by the manufacturer, DER, or FAA. Substitution of bolted or riv­ eted connections for spot-welded joints are to be specifically approved by a DER or the FAA. Repair secondary structural and non­ structural elements such as tip bows or leading and trailing edge tip strips of wing and control surfaces by soldering with a 50-50 lead-tin sol­ der or a 60-40 lead-tin solder. For best results, use a flux of phosphoric acid (syrup). Since the purpose of flux is to attack the metal so that the soldering will be effective, remove ex­ cess flux by washing the joint. Due to the high-heat conductivity of the stainless steel, use a soldering iron large enough to do the work properly. Par 4-103 Page 4-75

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