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2.6 Using a finger-trapping needle or wire, insert the end of the splice line into the main line at
the 10" mark on the main line and out at the 16" mark. Pull the splice line up until the two
10" marks align [Figure C]. Pin the splice with a safety pin to prevent movement.
2.7 Next take the end of the main line and finger-trap the end directly into the splice line approximately
.25" from where it enters the main line and then exit at the 16" mark.
2.8 Figure D shows the resultant configuration.
2.9 Take the blank end of the splice line and finger-trap it into the other end of the main line at
the 10" mark and exit at the 16" mark.
2.10 Have one person apply tension on the main line. Adjust the finger-trap tension to provide the
correct length of the line against the adjacent lines [Figure E]. The spliced line should have
slightly less tension to allow for the last finger-trap.
2.11 Take the running end of the main line and finger-trap it into the splice line approximately
.25" from the insertion point as was done with the lower splice. Exit at the 16" mark.
2.12 Pull the finger-trapped sections tight [Figure F]. Again check the length of the line against
the adjoining lines. If the length is correct, trim the excess lines so that they disappear into
the finger-trap.
2.13 Sew the finger-trapped sections with the zigzag machine set for 5-7 stitches per inch
[Figure G].
3.0 INSPECTION:
3.1 Check the length of the line against adjacent lines for trim.
3.2 Check the zigzag overstitch of the finger-trap sections.
7-30
Parachute Repair Procedure
TITLE: 7.1.11 Square Canopy – Control Line Replacement
NUMBER OF PAGES: 4
APPLICABLE PRODUCTS: Square main canopies.
DESCRIPTION: Replacement of the control line assemblies on square main canopies.
AUTHORIZED REPAIRMEN: FAA Senior or Master Parachute Rigger
MATERIALS: E thread—color to match
Suspension line—type and color to match. Most control line assemblies utilize
two or more types of line: one for the upper control lines and a stronger
one for the lower control lines.
MACHINES: 308 Zigzag—Medium Duty 7-11 SPI
1" x 42 stitch bar tack [Optional]
EQUIPMENT:
Scissors
Seam ripper
Marking pencil
6" ruler
Tape measure
Small safety pins w/marker flags
PROCEDURE
Note: Some manufacturers provide line measurements for their canopies in their owner’s manuals.
If so, the rigger should thoroughly measure the control line assembly and compare the measurements
against those in the manual. Over time and use, the control lines have a tendency to
stretch and change dimensions. At the same time, the rigger needs to compare the right and left
side assemblies against each other for any differences. It is not uncommon for the left and right
control lines to be different
lengths, having been changed to
remove a slight turn or change
the opening characteristics.
Figure A is a sample chart that the
rigger can fill in to document the
various dimensions needed to
repair or replace control lines.
7-31
A
B
E
C
D
Toggle Mark
Brake-Set Loop
Mark
Allow at least 6 inches
extra for Finger-Trapping
A - UST - Upper Steering Lines
B - Lower Control Line(s)
C - LST - Lower Steering Lines
D - BRK - Tog Line
E - Lower Control Line
Toggle Setting
A
B
C
D
E
Left Right
Figure A
1.0 DISASSEMBLY:
1.1 After measuring the control lines, remove them from one side only. Leave the other side for
a reference to check the new lines against both for measurements and construction.
2.0 REASSEMBLY:
2.1 Determine how many upper control lines there are on the canopy. Four is the most common
and this procedure will use this number for the example. With four upper control lines, there
are really two continuous lines forming the assembly. Each pair of upper lines is folded in the
middle to form two legs of the upper assembly. Each line is therefore measured at twice the
A dimension plus 12". If the upper control lines have different lengths, make sure to use the
longest measurement to determine the cut length for A (Refer to Figure A).
2.1.2 Using a finger-trapping needle or wire, finger-trap
a loop at the center of each of the lines, so the
result is a line with a loop at the center with two
legs extending from it [Figure B]. The eye of the
loop should be no more than .25" with the fingertrapped
portion 1" long. Bar tack or zigzag the finger-
trapped section.
2.1.3 There are two types of lower control line configurations:
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Parachute Rigger Handbook(77)
