Figure 7-5. Using a Tensiometer
When taking a reading, it may be
difficult to see the dial. Therefore a
pointer lock is present on the
tensiometer. Push it in to lock the
tensiometer from the cable and
observing the reading, pull the lock
out and the pointer will return to
different sizes of cable. Each riser
has an identifying number and is
identified in the tensiometer kit.
Risers are easily inserted into the
c. Conversion of Tensiometer Reading to Pounds.
Each tensiometer comes with a conversion table which
is used to convert the dial reading to pounds. The
conversion table is very similar to that shown in figure 7-
6. The dial reading is converted to pounds of tension as
The conversion table shown in
figure 7-6 is only an example to
illustrate the process of conversion.
Consult the table included with the
tensiometer being used for the
correct tension values.
Note that the risers are specified for
use with specific cable diameters.
Since this particular tensiometer is
not designed for use in measuring
7/32- or 1/4-inch cable, no values
are shown in the column for the
number 3 riser.
(1) Using a number 2 riser to measure the tension
of a 3/16 inch cable, a reading of 48 is obtained.
(2) As shown in figure 7-6, read across to the
tension column for a reading of 70 pounds. Therefore,
the actual tension of the cable is 70 pounds.
d. Cable Rigging Tension Charts. Cable rigging
tension charts are graphic tools used to compensate for
establishing cable tensions in flight control systems,
landing ear systems, or any other cable-operated
systems. A typical chart is shown in figure 7-7. To use
the chart, proceed as follows:
Figure 7-6. Conversion of Tensiometer Reading in Pounds