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Archive / FAA Powered Parachute Flying Handbook / FAA Powered Parachute Flying Handbook: Chapter 5 — Weight and Balance

Chapter 5 — Weight and Balance

Chapter 5 — Weight and Balance — Part 3

FAA-H-8083-29 (2015)

the wing bag, and one line sleeve up and around the

cart to follow the bag; those lines should run straight

from the attach points on the cart to the wing bag after

the bag is in position behind the cart. Tilt the wing bag

toward the cart to spill the folded wing out of the bag

and onto the ground. [Figure 5-13]

With the wing folded behind the cart, you are ready

to spread it out and in doing so begin to visually in -

spect the uninflated wing. Unfold the right side of the

wing toward the right and repeat on the left side. As

you unfold the wing, it should remain centered di -

rectly behind the cart. After the wing is completely

unfolded, stand directly behind the cart and hold the

leading edge of the wing up in front of you as you

face the backside of the cart. You will see an “x” in the

lines; this “x” should be positioned directly behind

the centerline of the prop on the cart. [Figure 5-14] If

it is not, physically pick up the center and drag it into

the center position. Then go to the end of the side that

will be bunched up and pull out the slack.

Remove the protective sleeves that cover the sus -

pension lines and their components. The protective

sleeves are referred to as line sleeves and there is a

line sleeve on each set of lines (or two— the right and

the left). [Figure 5-15]

While laying out the wing, check for tears in the fab-

ric, torn or loose stitching, abrasions, and deteriora -

tion of the fabric from ultraviolet rays. The sun is one

of the powered parachute wing’s worst enemies, next

to the prop! Certain colors deteriorate faster than oth-

ers, like red and orange, when exposed to ultraviolet

rays from the sun. When the wing is not being used,

you should always return it to its wing bag. Take this

opportunity to check the wing cells for debris, such as

stones, sticks, and bugs; lifting the wing by the trail -

ing edge and gently shaking it will allow most cap -

tured debris to fall out of the ram-air openings on the

leading edge of the wing.

With the wing centered behind the cart, it is time to

start checking the suspension lines. At first glance

it may look difficult to sort out all of the lines from

the cart to the wing. Most of the time, the lines will

straighten out with just a light flick of the wrist. Make

sure you have no twists or line-overs and your lines

are straight. As long as the wing has not been physi -

cally removed, or disconnected from the cart, there

should not be any permanent knots in the lines. In

the event that you detect pressure knots during the

line inspection they are easily removed with minimal

manipulation.

Small twigs, stems from weeds, and other debris can

get caught in the lines to form pressure knots. Pres -

sure knots are a concern because they are only “knots”

when there is tension on the lines. That means they are

only a problem when your wing is inflated. As soon

as you land, the foreign object often shakes free and

there is no knot. However, while you are flying, that

Figure 5-13. Wing removed from wing bag and folded

behind the cart.

Figure 5-15. Removal of the line sleeve is an important

step in the wing layout and inspection.

Figure 5-14. “X” in the suspension lines marks the exact

center of the uninflated wing.

pressure knot can cause the powered parachute to go

into a steep turn. Make sure there is nothing around to

catch into your line sets. The more organized the sus-

pension lines are laid out during this preflight check,

the more likely that the wing will kite evenly and

without mishap. It may take a great deal of space to

get all the cells open during the inflation of the wing.

Aborting the takeoff to re-kite the wing is always an

option, but it is not desirable. Preflight the wing cor -

rectly the first time.

If you put your wing away correctly and took it out

as described, it should not have any twists in it. How-

ever, you still need to check. Start where the risers at-

tach to the cart. Make sure they are not twisted around

anything and trace each one back to the point where

the wing risers are attached to the cart.

Check the steering lines on both sides of the cart;

make sure the anchor point knots are secure and the

lines flow freely through all guides and pulleys. Make

sure the links on both sides of the aircraft are secure;

it is recommended that the links are finger tight plus

one-quarter turn. Continue by checking that the riser

cables are not twisted or damaged and they are free

from tangles. At this time pull slack from the steering

lines so the steering bars are fully retracted. Physi -

cally separating the steering lines from the suspension

lines, pulling them out and away to the outer edge of

the wingtips, enables you to visually see the steering

lines are free from being tangled with the rest of the

lines. [Figure 5-16]

Continue to check the suspension lines for tangles,

knots and wear and the attachment points for security

and lack of fraying. [Figure 5-17] The A lines should

be visually and physically separated from the B lines

at the point where the lines are connected to the ris -

ers. Most newer wing lines are color-coded to make

this process visually easier; the older wing styles will

still be separated and configured the same way as the

newer wings, however all the lines will be the same

color. The A lines will travel toward the leading edge

of the wing and subdivide into the C lines. The B lines

will travel toward the trailing edge of the wing and

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 manufac-

turers 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 al -

ways 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 at -

tached 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

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 dur-

ing 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 clock -

wise 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 manu-

facturer 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 individu -

ally—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 para-

chute 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.

With the wing laid out behind the cart, determine if

the twist is clockwise or counterclockwise in configu-

ration. If the twist in the line is traveling clockwise as

you face the chute, the wing edge you are working with

will have to travel counterclockwise back through the

Figure 5-20. Pilot throwing the wing edge through to undo

a line twist.

Lay out the half of the wing you just worked on. If that

side looks good, it means you can do the same thing

to the other side of the chute. The same sequence of

checking for twist direction, gathering the lines and

then twisting the wing edge in the opposite direction

of the twisted lines is completed on the second set of

lines. It stands to reason that the twist will be in the

opposite direction than the twist on the other set of

lines you just cleared.

There is a possibility that the side you are working

on still doesn’t look right when you re-check it. If the

lines still look twisted, then you probably flipped the

wing the wrong way. The good news is that there are

only the two types of line twists, clockwise and coun-

terclockwise—with a little practice you will be able

to recognize the twist well before you start handling

the wing.

Line-Overs

The line-over is one of the most dangerous things that

can happen to the powered parachute wing. A line-

over is exactly what it sounds like. Instead of the wing

line going straight from the wing to the riser system, it

takes a trip over the top of the wing first. This means

that when the wing inflates, the suspension line that is

over the top of the wing will pinch the wing together

and prevent the proper inflation of the wing to pro -

duce the airfoil necessary to achieve flight. If a line is

over the top surface of the wing, the pilot risks serious

injury or death if takeoff is attempted. To recognize

a line-over before you take off, look for a line that is

twisted with other lines on one or both sides of the

wing. If you see that, your next step should be to in -

spect the leading edge and top of the wing closely. If

you see a line wrapped over the top, you have found

your problem.

Sometimes using the “stacked” method of laying out

the wing during the final wing staging before flight

versus the “inverted” method can inadvertently pro -

duce a line-over on the top side of the wing as it in -

flates. Also, “stuffing” the wing into the wing bag

versus methodically folding the wing for storage can

cause a line to become wrapped around the top of the

wing mistakenly. [Figure 5-21]

To correct a line-over, pull the fabric of the wing

through the loop made by the line-over. To know

which side to pull the noncompliant suspension line

to, trace the line to its home line group (left or right

riser) before you start pulling things around. Some -

times the side will be easy to determine because the

line-over is either close to the left or right edge of the

Figure 5-21. A simulated line-over.

wing. When it is not, tracing it is the best way to save

time and to determine the correct way to pull the wing

fabric.

Preparing for Takeoff

Wing inflation and kiting procedures are critical to a

successful takeoff. Refer to Chapter 7 for informa -

tion on how to lay out the wing, wing inflation, and

kiting.

After Landing

It is imperative to evaluate the field in which you in -

tend to land, particularly because of the unique nature

of the powered parachute wing, and what happens to

it prior to landing. If the field is being used by other

aircraft, taxi the powered parachute off the “active”

area or runway surface while the wing remains kited.

Ground taxiing with the wing kited takes a little prac-

tice, but the flight instructor will make sure the stu -

dent pilot has adequately mastered this skill prior to

takeoff instruction.

After the powered parachute has touched down, re-

lease the flare on the wing; this is done to prevent the

aircraft from becoming airborne again. Not releasing

the flare on landing is a critical and common mistake

made by both new and seasoned PPC pilots. With the

throttle at idle, the powered parachute begins to slow

down to the point where the stream of air is not suf -

ficient to maintain the wing’s pressurization. At this

time, the engine must be shut down immediately; the

consequences of not turning off the magnetos dur -

ing the after-landing roll are detrimental to the well-

being of the wing because the propeller will most

likely chop the PPC lines. A turning propeller and the

wing and its components do not mix. Once you turn

off the magnetos, you will physically grab the steering

lines from overhead and pull the wing to the ground

to finish the deflation process. If the wing is allowed

to “float” down on its own, a small gust of wind can

force the suspension lines onto hot exhaust surfaces

which can melt the lines, or even pick up the cart and

instigate a landing roll.

Clearing the Runway

If a powered parachute lands on the center of a run -

way, it is considered good practice to taxi to the edge

of or even off of the runway before collapsing the

wing and stowing equipment. When doing that, it is

important to keep the powered parachute moving af -

ter landing to keep the wing inflated. The safest and

easiest method is to keep taxiing straight into the wind

until you clear the runway or landing area and can

collapse the parachute out of the way of other aircraft.

If you determine that winds are too strong or gusty to

taxi off of an active runway, an alternate landing area

should be chosen.

Parking

Unless parking in a designated, supervised area, you

should select a location which will prevent the propel-

ler blast of other airplanes from striking the powered

parachute broadside. The powered parachute engine is

not enclosed in a cowling and engine surfaces will be

extremely hot. Never assume a bystander will know

this; even though the engine is not operating, it can

still be dangerous.

Once out of the powered parachute, you should im -

mediately pull the trailing edge of the wing forward

toward the cart and roll the leading edge and cell

openings under the wing surface; this will prevent

gusts of air from grabbing the wing and pulling the

cart backward. After the wing is totally disabled from

becoming airborne, you can assist your passenger in

disembarking from the cart.

Postflight

A flight is never complete until the engine is shut down

and the aircraft is secure. A pilot should consider this

an essential part of any flight.

After engine shutdown and the passenger exits the

cart, the pilot should accomplish a postflight inspec -

tion. This includes checking the general condition of

the aircraft. For additional departures, the oil should

be rechecked and fuel added if required. If the PPC is

going to be inactive for a period of time, put the wing

properly back in the bag to keep it out of the sun.

Packing the Wing

As discussed earlier in this chapter, packing the wing

back into the wing bag at the end of the flight is a nec-

essary task. The care and method the pilot employs

for this critical task directly affects whether or not the

wing is easy to unpack for the next flight. The process

of folding the wing and returning it safely to its wing

bag takes little time and the powered parachute pas -

senger can lend a hand to the pilot in the process. If

the pilot is flying solo the process will take a little

longer, but the overall results will be the same and

this gives the pilot an opportunity to do a thorough

postflight inspection of both the wing itself and the

suspension lines.

After disembarking from the cart, the wing should be

repositioned in the inverted layout with the exception

that the cart/prop hoop will be positioned very close

to the trailing edge of the wing. At that time the line

sleeves should both be replaced on each set of sus -

pension lines. When the line sleeves are in place, the

two bundles and any suspension lines left showing

are placed on the exposed lower surface of the wing

where they will be neatly packaged for storage during

the folding process of the wing.

Starting with one outer trailing edge of the wing, draw

the wing surface up and over the surface of the wing

fabric to the very center of the wing. The same action

will then be completed on the leading edge of the wing

on the same side. The process is then completed two

more times on the same side. Then the wing is folded

from the other side three times in the same manner,

resulting in a long rectangle of wing lying directly

behind the prop line of the cart. This is one example;

it is important for you to follow the manufacturer’s

recommendations for your PPC.

The pilot then starts at the edge closest to the cart and

folds the sides of the folded wing alternately in on

each other, depressing the trapped air out of the fabric,

all the way to the farthest area away from the cart.

[Figure 5-22] Once this is complete, the wing pack -

age size is established by taking the farthest edge and

folding it toward the cart over and over until a neat

square is obtained on the last fold.

After the wing is folded and lying on the ground be -

hind the cart, the wing bag is placed on the ground

next to the wing (on the side away from the cart).

[Figure 5-23] It is advised to have a “marked” side

of the bag and always keep the marked side facing up

or in the same direction every time you load the wing

into the bag and onto the cart. The wing is then neatly

pulled into the bag. The pilot then picks the bag up on

end and gathers the line sleeves on top of the wing.

[Figure 5-24] Refer to the manufacturer’s recommen-

dations for loading the wing in its bag on the cart for

taxi and storage.

Figure 5-23. With the wing folded, you pull it into the bag.

Figure 5-24. The line sleeve on the side of the cart where

the bag will be stored can be placed on top of the folded

wing, inside the bag; the other line sleeve will be used to

store the bag on the cart.

Figure 5-22. Squeeze out the air as you fold the wing for

packing.

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