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connector link and re-clamped.
1.6 Measure the control line groups and fill in the boxes.
2.0 REASSEMBLY:
2.1 Compare the measurements to the original line lengths as in the manual.
2.2 Depending on the type of canopy and type of line used, most canopies tend to have the center
A lines stretch due to the load on opening. The outside lines that attach to the stabilizers
and the control lines, tend to shrink due to the friction generated by the slider on opening.
The key concept to remember is that the length of the lines is not the critical dimension.
What is most important is the trim differential, which determines the angle of attack of the
canopy. The trim differential is the difference in the line length between the A,B, C, and D
lines. The most accurate method of measuring this is to use the A lines as the base dimension
and then measure A-B, A-C, and A-D. This method takes into consideration the tolerance
allowed. This dimension is what makes the canopy open and fly correctly. If the overall
length of the lines is 2-3" longer or shorter, but the trim is correct, there will probably be no
appreciable effect on the canopy. With this in mind, it may be desirable to in effect “shortline”
the canopy during the trim process in order to not have to replace any main lines.
2.3 Because of the fact that the cascaded main lines may stretch at different rates, the adjustment
to be made to the lines that have stretched (i.e., gotten longer) will need to be done at the
canopy end and not at the connector link.
2.4 Remove the bar tacks or zigzag stitching at the canopy end of the lines.
2.5 Adjust the line length as needed to return to the original dimensions. Re-tie the knots or finger-
trap as necessary and resew as per the original.
2.6 For the lines that may have shrunk in length, it may be possible to gain as much as 2-3" of line
adjustment by utilizing the extra line that is finger-trapped into each line attachment point.
Depending on the type of line used on the canopy, the amount of excess line finger-trapped may
vary. Dacron lines can have as little as 2-3" inserted into the finger-trap and hold securely. The
smaller and more slippery Spectra® line is recommended to have at least 6" of line inserted into
the finger-trap. So, depending on the amount of line that is needed to be gained for the trim adjustment,
the rigger may be able to adjust each end of the line to gain the necessary adjustment.
2.7 If this needed line can be gained, remove the bar tacks or zigzag at each end of the line and
reattach after adjusting the length. Before permanently attaching, the rigger should simply tie
the lines in place and check the trim. If everything is within limits, then re-tie or finger-trap
and restitch with bar tacks or zigzag as per the original.
3.0 INSPECTION:
3.1 Check final trim dimensions against original.
3.2 Check continuity so there are no twists or crossed lines.
3.3 Verify all junctions are either knotted or finger-trapped and sewn as per the original.
7-38
7-39
Container repairs share some techniques with canopy
repairs, such as single-side patches. Most repairs, however,
involve replacement of panels or flaps, Velcro®,
grommets, plastic stiffeners, worn binding tape, and broken
hand tackings. Even more so than canopy repairs,
the cosmetic results of the container repair are most
important to the customer, and thus the rigger. A shoddy
repair to the container is immediately obvious each time
the user puts on the parachute. Even if it is functional, it
has to look good to instill confidence in the user.
7.2 The following are repairs found in Section 2 of this
chapter.
7.2.1 Container fabric panel repair
7.2.2 Container grommet replacement
7.2.3 Container Velcro® replacement
7.2.4 Container plastic stiffener replacement
7.2.5 Main container side flap replacement
7.2.6 Bottom of container (BOC) pocket
replacement
7.2.7 3-ring release housing replacement
7-40
Parachute Repair Procedure
TITLE: 7.2.1 Container Fabric Panel Repair
NUMBER OF PAGES: 3
APPLICABLE PRODUCTS: All types of parachute container systems.
DESCRIPTION: Application of a patch repair to container panels.
AUTHORIZED REPAIRMEN: FAA Senior or Master Parachute Rigger
MATERIALS: E thread—color to match
Fabric—type and color to match
Nylon tapes—assorted types and widths such as Ty-3, Ty-4, or Ty-12
MACHINES: 301 Straight stitch—Medium Duty 7-11 SPI
308 Zigzag—Medium Duty 7-11 SPI
EQUIPMENT:
Scissors
Seam ripper or scalpel
Marking pencil
6" ruler
Hot knife
Hot glue gun
　
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