TM 1-1520-240-BDFigure 7-4. Repair (Flareless) Seat7-15. BLEEDAIRPIPELINES.Effective repair of hotbleed air ducts is considered temporary. Limited repairmay be made as outlined below:a.RepairProcedures. Repair should be limited toareas not exceeding two inches in diameter (Figure 7-5).b.Insulation. Remove enough insulation blanketor permanent insulation to gain access to metaldamaged area. Clean duct surface, and smooth outdamaged area.c.Installation. Install flexible stainless steel sheet(0.016 to 0.018 inch thick) or aluminum sheet with 2wraps, around entire duct circumference. It shouldextend about two inches laterally in each directionbeyond the damaged area or puncture.d.HoseClamp. Install enough hose damps (aboutfive) to secure repair area. Exercise care whentightening damps. Overtightening may damage or crushthe bleed air duct.7-18. ALUMINUM TUBING DAMAGE7-17. GENERALINFORMATION .Aluminum tubing issubject to damage by projectiles and fragments.Replacement with original replacement parts isdesirable, but not essential. In BDAR, tubing and hose,AN and MS fittings, and other similar components canbe substitutes one for the other. Available time, tools,skills, and materials will determine which repair option touse. Whenever a line has complex bends, replacementof the damaged section with MS fittings, OPTION 3, isprobably the quickest fix.7-18. LIMITATIONS .None7-19. OPTION1.In One Repair (damage to straightsection of tubing).a.Materials/ToolsRequired:2 Repair Fittings-Shape MemoryMetal/Heat ShrinkSplice TubeTubing CutterKnife or FileHeat Gunb.ProceduralSteps:(1)Cut and remove damaged section oftubing, Figure 7-6. Tube ends must be square.(2)Clean ends of undamaged tubing withknife or file.(3)Measure the distance between the twoundamaged ends and prepare a tube splice replacementsection of this size. Clean ends of splice section asdone in Step 7-19.c.(2).7-7
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