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MACHINES: 301 Straight Stitch—Medium Duty 7-11 SPI
EQUIPMENT:
Scissors
Seam ripper or scalpel
Marking pencil
6" ruler
Pin board
Straight pins
Patching triangle
Hot knife
PROCEDURE
Note: There is no limit as to how many crossports may be repaired on a main canopy. Reserve
canopies are another matter. The number and authority to repair crossports on a reserve varies
between manufacturers. Before attempting to repair the crossports of a reserve, first check with the
manufacturer.
1.0 DISASSEMBLY:
1.1 Many times, when the crossport is damaged, there is extensive gathering and distortion of the
fabric. Before progressing, smooth out the fabric to reshape the rib as close as possible to its
original shape.
2.0 REASSEMBLY:
2.1 The basic idea of the crossport repair is a three-sided patch sewn the same as a standard
French fell seam patch. The fourth side is open and recut to the shape of the crossport
[Figure A]. However, if the damage is extensive enough, it may be advisable to patch the
complete crossport area and then recut the crossport in its original shape with a hot knife.
2.2 Pin the rib to the pin board.
2.3 Mark out the damaged area as you would a standard
patch. Lay the patch material in place and pin.
2.4 Sew the patch in place with a seam 1/16" from the
edge.
7-35
2.5 Turn the patch over, fold the seam, and sew as a standard
patch [Figure B].
2.6 Lay the repaired rib on a suitable surface and recut the
crossport shape in the exposed edge of the patch material
with the hot knife [Figure C].
3.0 INSPECTION:
3.1 Verify the seams of the patch are even and thread tension is
correct.
3.2 Hot knifed edge of the crossport must
be smooth and even.
7-36
Parachute Repair Procedure
TITLE: 7.1.13 Square Canopy – Trim Check and Retrim
NUMBER OF PAGES: 2
APPLICABLE PRODUCTS: Square main canopies.
DESCRIPTION: Retrimming the suspension lines of main canopies to return to the original trim
specs.
AUTHORIZED REPAIRMEN: FAA Senior or Master Parachute Rigger
MATERIALS: E thread
MACHINES: 308 Zigzag—Medium Duty 7-11 SPI or
1" x 42 stitch bar tack [Optional]
EQUIPMENT:
Scissors
Seam ripper or scalpel
Marking pencil
6" ruler
25' Tape measure
Pony clamp
PROCEDURE
Note: Checking and retrimming main canopies is a common requirement for riggers. All canopies
and all kinds of suspension lines get out of trim in time with use. The rigger that knows how to
quickly check the trim on a customer’s canopy, and then determine how much work it will take to
return it to the original configuration, is performing a valuable service. In most cases, as long as the
suspension lines are in good condition, retrimming a canopy will add hundreds of jumps to the life
of the canopy and return the performance to almost as good as when new.
This chart and procedure are tailored to apply to normal ram-air canopies. Certain designs, such as
elliptical canopies, may have nonstandard trim measurements that require more detailed measurements.
The rigger should consult the manufacturer’s manuals or technical data for these canopies.
1.0 DISASSEMBLY:
1.1 The first thing the rigger must do is to complete a measurement of the lines of the canopy.
Figure A shows a matrix for measuring the lines of the canopy. Simply fill in the boxes for
each dimension measured.
1.2 Start by laying the
canopy on the left
side, anchor the
connector links,
and flake it out as if
for packing. Most
canopy lines are
measured from the
inside of the connector
links, which
is called the “zero” point.
7-37
Line
BK-TOG
A
B
C
D
UST
LST
Left
10 9 8 7 6 5 4 3 2 1
Right
1 2 3 4 5 5 4 3 2 1
Figure A
1.3 Anchor the end of the tape measure even with the zero
mark at the end of the lines using the pony clamp [Figure
B].
1.4 Start with the top outside right front corner line of the
canopy. This line will be line 1A. Depending on the number
of cells to the canopy, on a 7-cell canopy, the left corner
line will be line 8A. On a 9-cell canopy, this line will
be line 10A. Make sure that the canopy is oriented correctly
so that the measurement sequence follows the
boxes on the chart.
1.5 Measure all the A lines first, then proceed to the B, C and D line groups. The lines should be
measured under approximately 10 pounds of tension. As the rigger moves through the lines
and changes riser groups, the end of the tape measure should be moved to the corresponding
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Parachute Rigger Handbook(79)
