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RIGGING AND ADJUSTING TOOLS
Throwboards

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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the amount of force required to deflect a cable a certain distance at right angles to its axis. The cable to be tested is placed under the two blocks on the instrument, and the lever assembly on the side of the instrument is pulled down. Movement of this lever pushes up on the center block, called a “riser.” The riser pushes the cable at right angles to the two clamping points. The force required to do this is indicated by a pointer on the dial. Different risers are used with different size cables. Each riser carries an identifying number, and is easily inserted in the instrument. Each tensiometer is supplied with a calibration table to convert the dial readings into pounds. One of these calibration tables is shown in figure 9-23. For example, if the pointer on the dial indicates 48 with a No. 2 riser and a 3/16-inch diameter cable, the actual tension on the cable is 100 pounds. With this particular instrument, the No. 1 riser is used with 1/16-, 3/32-, and 1/8-inch diameter cables. CAUTION The calibration table applies to the particular instrument  only, and cannot be used with any other. For this reason, the calibration table is secured inside the cover of the box in which the instrument is kept. The chart is serialized with the same serial number as the instrument. Using the cali- bration table from another instrument will result in inaccurate reading. During the adjustment of turnbuckles, the calibration table must be used to obtain the desired tension in a cable. For example, to obtain a tension of 110 pounds in a 3/16-inch diameter cable, the No. 2 riser is inserted in the instrument and the number opposite 110 pounds is read from the calibration table. In this case, the number is 52. The turnbuckle is then adjusted until the pointer indicates 52 on dial. NOTE: Tensiometer readings should not be taken within 6 inches of any turnbuckle, end fitting, or quick disconnect. the In some cases, the position of the tensiometer on the cable may be such that the face of the dial cannot be seen by the operator. In such cases, after the lever has been set and the pointer moved on the dial, the Figure 9-24.—Rigging pin set. 9-30







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