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9/27/01 TABLE 9-2. Tube data. AC 43.13-1B CHG 1 Minimum bend radii Wrench torque for tightening AN-818 Nut (pound inch) Dash Nos. Ref. Tubing OD inches Aluminum-alloy tubing Minimum Maximum Steel tubing Aluminum-alloy tubing (Flare MS33583) for use on oxygen lines only Minimum Maximum measured to tubing centerline. Dimension in inches. Alum. Steel Alloy Minimum Maximum -2 -3 -4 -5 -6 -8 -10 -12 -16 -20 -24 -28 -32 1/8 3/16 1/4 5/16 3/8 1/2 5/8 3/4 1 1-1/4 1-1/2 1-3/4 2 20 25 50 70 110 230 330 460 500 800 800 - 1800 30 35 65 90 130 260 360 500 700 900 900 - 2000 75 95 135 170 270 450 650 900 1200 1520 1900 - 2660 85 105 150 200 300 500 700 1000 1400 1680 2100 - 2940 - - - 100 200 300 - - - - - - - - - - 125 250 400 - - - - - - - 3/8 7/16 9/16 3/4 15/16 1-1/4 1-1/2 1-3/4 3 3-3/4 5 - 8 - 21/32 7/8 1-1/8 1-5/16 1-3/4 2-3/16 2-5/8 3-1/2 4-3/8 5-1/4 - 7 d. Replacement of Flexible Lines. When replacement of a flexible line is necessary, use the same type, size, part number, and length of hose as the line to be replaced. Check TSO requirements. If the replacement of a hose with a swaged-end type fitting is necessary, obtain a new hose assembly of the correct size and composition. Certain synthetic oils re quire a specially compounded synthetic rubber hose, which is compatible. Refer to the air craft manufacturer’s service information for the correct part number for the replacement hose. If the fittings on each end are of the cor rect type or sleeve type, a replacement may be fabricated as shown in figure 9-8. Before cut ting new flexible wire braided hose to the proper size, tape the hose tightly with masking tape and cut in the center of the masking tape to prevent fraying. The use of a mandrel will prevent cutting the inside of the hose when in serting the fittings. Typical aircraft hose speci fications and their uses are shown in table 9-3. Install hose assemblies without twisting. (See figure 9-9.) A hose should not be stretched tight between two fittings as this will result in overstressing and eventual failure. The length of hose should be sufficient to provide about 5 to 8 percent slack. Avoid tight bends in flex lines as they may result in failure. Never exceed the minimum bend radii as indicated in figure 9-10. (1) Teflon hose is used in many aircraft systems because it has superior qualities for certain applications. Teflon is compounded from tetrafluoroethylene resin which is unaf fected by fluids normally used in aircraft. It has an operating range of -65°F to 450 °F. For these reasons, Teflon is used in hydraulic and engine lubricating systems where temperatures and pressures preclude the use of rubber hose. Although Teflon hose has excellent perform ance qualities, it also has peculiar characteris tics that require extra care in handling. It tends to assume a permanent set when exposed to high pressure or temperature. Do not attempt to straighten a hose that has been in service. Any excessive bending or twisting may cause kinking or weakening of the tubing wall. Re place any hose that shows signs of leakage, abrasion, or kinking. Any hose suspected of kinking may be checked with a steel ball of proper size. Table 9-4 shows hose and ball sizes. The ball will not pass through if the hose is distorted beyond limits. (2) If the hose fittings are of the reus able type, a replacement hose may be Par 9-30 Page 9-19PDF Image | AFS-640
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