that the cables were tightened evenly, check the
forward sector rig pin hole to see if the rig pin can be
inserted through the sector and into the structure. If
this is not possible, then the cables must be adjusted
by loosening one and tightening the other. This will
maintain the correct tension on the cables, and, at the
same time, rotate the forward sector to the neutral
position. The cable section is properly rigged when it
is possible to insert and remove the forward sector rig
pin easily with the aft sector pin installed and the
cables tightened to the prescribed tension.
The push-pull rod connecting the forward sector
and the bell crank is adjusted to the correct length by
installing a rig pin in the bell crank. Then, the rod
adjustable eye is turned in or out until the rod can be
installed between the sector and bell crank without
binding. At this point three rig pins are in place, and
should remain in place until the control sticks are
rigged to neutral.
When you are positioning the control sticks to
neutral, the rear stick must be adjusted first.
Remember, we are working forward from the elevator
surface. The push-pull rod connecting the bottom of
the rear stick with the bell crank must be adjusted
until the stick center line is the prescribed number of
degrees forward of a vertical reference line. See the
vertical reference line (14) and the center line (15) in
figure 9-26. The vertical reference line is a position
that the center line of the control stick would attain at
a 90-degree angle (19) to the cockpit floor (20).
Adjust the length of the push-pull tube between the
control sticks to position the front control stick to an
angle identical to that of the aft control stick. Then,
remove all three rig pins. This completes the rigging
and adjusting of the control system to neutral. All that
remains is to adjust the stops that limit the fore and aft
Figure 9-27.Elevator rigging fixture.
travel of the control sticks, and rig and adjust the
bungee that holds the system in the neutral position.
The stop bolts (2) (fig. 9-26) are located in front
and behind the aft control stick. They are installed so
that the stick hits the stop bolts at the extreme limits of
its travel. The maximum travel of the elevators in
each direction is determined by the manufacturer and
is controlled by the stop bolts. With the rigging
fixture still in place, move the control stick all the way
forward, and adjust the stop until the elevator DOWN
throw conforms to the MIM. Pull the stick all the way
aft, and adjust the aft stop bolt to obtain the correct
elevator UP throw. The stop bolts are safety wired in
place after this adjustment.
The last item to be adjusted in this control system
is the centering bungee.
Connect the bungee and
adjust its rod end so that with the stick against the stop
bolt in the full down elevator position, the bungee is a
minimum of 1/32 of an inch from bottoming. After
this adjustment, the elevators should be held in
neutral (plus or minus the prescribed number of
degrees) by bungee action. If the elevators are too
high, shorten the bungee rod end. If they are too low,
lengthen the bungee.
With the bungee properly
adjusted, tighten the bungee rod end locknut and
safety wire it.
Control cables are fabricated mostly of extra
flexible, preformed, corrosion-resistant steel. Control
cables vary from 1/16 to 3/8 inch in diameter. Cables
of 1/8 inch and larger are composed of 7 strands of 19
wires each. Cables 1/16 and 3/32 inch in diameter are
composed of 7 strands of 7 wires each.
Cutting cables may be accomplished by any
convenient method except an oxyacetylene cutting
torch. The method of cutting usually depends upon
the tools and machines available. If a cable tends to
unravel, the ends may be sweat soldered or wrapped
with a strip of tape prior to cutting.
Small diameter cable may be cut satisfactorily
with a pair of heavy-duty diagonal cutters, side
cutters, or a pair of wire nippers. Best results are
obtained if the cutting jaws are held perpendicular to
the cable during the cutting operation. Cables up to
3/32 of an inch in diameter may be cut in one
operation by this method. Larger cables may require
two or more cuts.
When you cut large diameter