Table 4-10. Hose Clamp Tightening, Fingertight-Plus Turns Method

TM 1-1500-204-23-2 Table 4-10. Hose Clamp Tightening, Fingertight-Plus Turns Method Clamps, Radial Instal Installation Clamp, worm screw-type and other type only (10 threads per Inch) (28 threads per Inch) Self-Sealing Hose Fingertight Plus 2 Fingertight Plus 2 1/2 Complete Turns Complete Turns Approximately 25 to 30 Inch-Pounds All Other Aircraft Hose Fingertight Plus 1 1/2 Fingertight Plus 2 Approximately 25 to 30 Complete Turns Complete Turns Inch-Pounds 30 inch-pounds, component parts of connection shall be examined and unserviceable parts replaced. (c) Hose clamps installed on rubber nipple- type fuel cell fittings and fuel system molded rubber connections shall be tightened to a torque of 15 inch- pounds for original installation, and maintained at finger- tight plus 1 1/4 turns. Fuel cell fittings are very easily damaged by hose clamps; therefore, these torque values shall be followed. (d) As an alternate method, hose clamps may be tightened with a special hose clamp tool easily fabricated from a long midget socket (figure 4-32) A slot is cut through hex end of socket wide enough and deep enough to accommodate thumbscrew portion of hose clamp. This type of tool may be used on the end of a ratchet or extension. c. Repair of High-Pressure Tubing Assemblies High-pressure tubing assembly can be repaired either by removal of the damaged section and a union in- stalled, or by replacement of the entire tubing assembly. (1) Repair. The damaged portion of tubing is cut out and removed (see figure 4-33). The ends of the remaining tubing are cleaned and deburred. If the damaged section of the tubing does not exceed the length of a union, a new tube section is not needed. (2) Replacement. If a tubing assembly Is to be replaced, fittings can usually be salvaged and replacing assembly will amount to replacement of tubing only. If tubing is small and made of soft material, assembly may be formed during installation by hand bending. How- ever, if tubing is of such material and size that hand bending is impractical, care shall be taken to remove assembly without further damage or distortion so that it can be used as a forming template. This will allow duplication as to length, bends, and angles. All tubing for replacement in low pressure oxygen systems shall Figure 4-32. Tightening Hose Clamp with Socket 4-30