Table 4-3. Hose Clamp Tightening, Fingertight-Plus Turns Method, Beaded Tubing

TM 1-1500-204-23-2 Table 4-3. Hose Clamp Tightening, Fingertight-Plus Turns Method, Beaded Tubing Clamps, radial Initial 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 Figure 4-17. MS Fitting and Components (2) Clamps on self-sealing hose. Hose clamps installed on self-sealing hose shall be tightened to a torque of 25 inch-pounds minimum to 30 inch- pounds maximum for original installation, and main- tained at this torque value. When sealing is not effective at 30 inch-pounds, component parts of con- nection shall be examined, and unserviceable parts replaced Under no circumstances shall hose clamp be tightened in excess of 30 inch-pounds in an attempt to effect sealing This added torque will reduce safety factor of hose clamps as well as destroy hose and connection. (3) Clamps on nonself-sealing hose. Hose clamps installed on nonself-sealing hose shall be in- stalled and maintained at a torque of 25 inch-pounds minimum to 30 inch-pounds maximum. If satisfactory sealing is not accomplished at a torque of 30 inch- pounds, component parts of connection shall be ex- amined and unserviceable parts replaced. 4-3. Fittings. Hydraulic fittings are used throughout the hydraulic system to provide simple connections between hydraulic components and tubing. Standard MS (flareless) and AN (flared) fittings are used in Army aircraft. Both types are made in many different shapes and designs. They may be ordered in either male or female design or in a combination design (male on one end and female on the other). The hydraulic repairer is concerned with installing both the AN and MS fittings in aircraft hydraulic systems. Nor- mally, the fittings to be used in an aircraft hydraulic system are selected according to the design of the system. The hydraulic repairer repairs fitting failures by duplicating the original installation. 4-14