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Page 59
CHAPTER EIGHT
SECTION 8.6
MAST PLATE AND DOUBLE TRUSS (continued)
PHILLYSTRAN DOUBLE TRUSS INSTALLATION
When attaching the Phillystran truss material to the turnbuckle located on the truss boom, the rule of “don't
saddle a dead horse” still applies. You must be certain that the saddle portion of the wire clip is on the
longer or “live” side of the Phillystran, and the U-bolt section is on the “dead” or (short) side of the Phil-
lystran. Locate the 3/16” galvanized thimbles (PN 60-0048) and pry the end apart so that it will slide over
the eye portion of the turnbuckle. When the thimble is attached, be sure to bend the ends back so that it
cannot fall off. Unwind the turnbuckle so that approximately 1 inch of threads are still inside the frame, as
shown in
figure 8.61
. The slack is needed so that you can appropriately tighten the Phillystran once secured
to the turnbuckle.
When preparing the Phillystran truss, you will need to bring the Phillystran from below the thimble as shown
in
figure 8.62
. Loop the Phillystran around the thimble until the Phillystran is as tight as possible. Leave
approximately 8” of the Phillystran on the “dead” side as shown in
figure 8.63
and trim with a utility knife.
While holding the Phillystran so that it remains tight, position the first of the four wire clips
(PN 60-0045)
so
that the wire clip is as close to the thimble as possible. Tighten the wire clips, alternating between each nut
so that the tightening force is evenly distributed. Hold each portion of the Phillystran in place while tighten-
ing, to ensure that a good mate is formed between the two cables. Wait 20 minutes and tighten some
more, as cold-flow of the plastic usually occurs. Position the next wire clip approximately 1 inch behind the
first wire clip and tighten accordingly as shown in
figure 8.64
. Repeat with the remainder of the wire clips
as shown in
figure 8.65
.
Locate the plastic end cap (PN 60-0044) and push it onto the end of the Phillystran as shown in figure XX.
The cap will be difficult to slide on. An easy way to accomplish this is to heat the cap slightly with the heat
gun—it will slide on easier, but take care not to melt your plastic cap (or your fingers). Secure the Phil-
lystran pieces at the end of the wire clips with electrical tape as shown in
figure 8.66
.
Repeat the process of attaching the Phillystran to the truss attachment plate and the turnbuckles for the
remaining 3 portions of the boom truss. When all of the Phillystran is secured, the boom can be leveled.
FIG. 8.66
FIG. 8.61
FIG. 8.63
FIG. 8.65
FIG. 8.64
FIG. 8.62
