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subdivide into the D lines. Make sure that the lines
are all separated and not tangled. The A/C lines will
be on top of the B/D lines when the lines are returned
to the ground after the preflight of each section. Make
sure there is no debris around to catch in the line sets
during wing inflation; when the length of the line is
altered it changes how the line holds the wing. The
length of the lines are clearly defined by the manufacturers
and should not be changed. The more organized
Figure 5-16. The pilot will physically pull the steering
lines out and away from the bundle of suspension lines to
ensure they are tangle free.
Figure 5-17. Check the suspension lines for tangles, knots,
and wear.
the suspension lines are laid out during this preflight
check, the more likely that the wing will kite evenly
and without mishap; a lot of runway can be used up
trying to get all the cells open during inflation of the
wing. Aborting the takeoff to re-kite the wing is always
an option, but it is not desirable. Preflight the
wing correctly the first time; taking your time will pay
off in the end.
Line Tangles, Twists, and Line-Overs
Line tangles and twists can be frustrating if you do
not understand how to solve them. The good news
is that wing line problems are simple to understand,
few in type, and easy to solve. They break down into
line twists and line-overs. A definite advantage for the
pilot is that both ends of the suspension lines are attached
to either the risers or the wing. That means
there are no loose ends to get twisted in and around
each other. Any loops in the lines readily pull out if
shaken a little; gently shaking all of the lines loose is
5-15
an important step to get the wing laid out properly in
preparation for flight.
Line Twists
A line twist is when all of the lines on both sides of
the wing are spiraled together. Sometimes it will seem
that all of the lines on one side are twisted around
the steering line. That is actually the case. [Figure
5-18] Trying to fly the powered parachute with the
suspension lines twisted is unsafe and the pilot should
consider the wing unairworthy until the line twist is
removed. Line twists most often occur because the
pilot inadvertently flips, or turns, the wing over while
moving it from the stowed position. This is why it is
so important to put your wing away and take it out the
same way each time. The suspension lines can also
get twisted if the wing flies over the cart accidentally,
or if the wing is incorrectly repositioned behind the
cart when the wing settles to one side of the cart during
an aborted takeoff or during landing.
Figure 5-19. Undoing a line twist—beginning of the
process.
center of the two sets of lines (or through the center of
the circle created by the cart/wing configuration) and
under the twisted group of lines you are holding. A
counterclockwise twist will require just the opposite
movement. The wing edge will need to travel clockwise
under the line set and then up and over the twist
via the center of the circle. Remember to maintain the
clockwise motion for the counterclockwise twist, and
the counterclockwise motion for the clockwise twist.
Disconnecting the wing from the risers or the wing
from the cart is not a safe practice; the flight instructor
needs to explain this to the PPC student in detail. The
risers are specific to each cart. Refer to the PPC manufacturer
and the operating manual for information.
Starting at the riser cables, gather all the lines in the
group and walk toward the wing keeping the lines
gathered as you go. Once close to the wing, you can
easily manipulate the edge of the wing and not tangle
the lines any further. The key is to remember that the
lines are twisted as a group—not tangled individually—
therefore they must be untwisted as a group to
prevent them from becoming tangled. [Figures 5-19
and 5-20]
Figure 5-18. Line twist.
Unless someone has mistakenly twisted a single set
of suspension lines while rigging the PPC wing to the
cart at the attachment points, a line twist will happen
to both sets of lines on both sides of the powered parachute
at the same time. This stands to reason if you
think of the entire configuration of cart and attached
wing as a continuous structure or a complete circle.
To get rid of a line twist, you do not have to pack the
wing back into the wing bag and flip the whole bag in
reverse, although this is an option. You can actually
flip the wing while it is out of the bag.
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Powered Parachute Flying Handbook动力伞飞行手册(48)
