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MATERIALS: E thread
MACHINES: 308 Zigzag—Medium Duty 7-11 SPI
1" x 42 stitch bar tack [Optional]
EQUIPMENT:
Scissors
Seam ripper or scalpel
Marking pencil
6" ruler
Finger-trapping needle
60 pound fish scale or equivalent
PROCEDURE
Note: Many of the modern canopies are using Spectra® or other aramid fibers in place of nylon or
Dacron lines. These materials are stronger, lighter, and less bulky. An example is the 825 pound
Spectra® line common on many main canopies. The strength is higher but the bulk is smaller than
the 525 pound Dacron used in the past. Accordingly, the techniques needed to work this material are
more refined and precise.
1.0 DISASSEMBLY:
1.1 Lay the canopy out on one side and straighten the lines.
1.2 Remove the damaged line. If the cascade is undamaged, remove the cascade line from the
junction of the main line. If the cascade is damaged, remove it as well.
2.0 REASSEMBLY:
2.1 Cut a new main line approximately 24" longer than the old one.
2.2 Finger-trap a loop at the connector link end
[Figure A]. Make sure that the size of the
loop duplicates the original or adjacent
lines. If the loop is made too small, there
may be difficulty in changing connector
links or risers as needed. Sew the fingertrap
with either a zigzag or bar tack.
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2.3 Pre-tension the line. With Spectra®, load the line with approximately 30 pounds for 30 seconds.
Place the line on the connector link.
2.4 Feed the running end of the line through the slider and directly to the line attachment tape on
the canopy. Make sure that there are no twists to the line or it is around the other lines. Run
through the attachment tape and re-create the original knot [Figure B].
2.5 Tension the line using adjacent lines for reference [Figure C].
2.6 Mark the location for the entry point for the cascade line [Figure D].
2.7 Cut a piece of line approximately18" longer than the original cascade.
2.8 Finger-trap the cascade into the main line and sew with either a zigzag or bar tack
[Figure E].
2.9 Attach the main line to the line attachment loop as per the original knot configuration.
2.10 Tension the line against the adjacent lines and secure the knot [Figure F]. Repeat with the
cascade.
2.11 Finger-trap the running end of the lines and sew with either a zigzag or bar tack [Figure G].
3.0 INSPECTION:
3.1 Check the length of the main line and the cascade line under tension against adjacent lines.
3.2 Check stitching such as zigzag or bar tacks.
3.3 Check line continuity.
Parachute Repair Procedure
TITLE: 7.1.10 Square Canopy – Line Splice
NUMBER OF PAGES: 2
APPLICABLE PRODUCTS: Square main canopies.
DESCRIPTION: Line splices for all square main canopies with braided type suspension line.
AUTHORIZED REPAIRMEN: FAA Senior or Master Parachute Rigger
MATERIALS: E thread—color to match
Suspension line—type and color to match
MACHINES: 308 Zigzag—Medium Duty 7-11 SPI
EQUIPMENT:
Scissors
Seam ripper
Marking pencil
6" ruler
Finger-trapping needle or wire
Hot knife
Small safety pins
PROCEDURE
Note: This procedure consists of two types of splice. The first is an internal. The second is a joining
splice. The internal splice is used when there is minor damage to the line but the line is still intact.
The joining splice is used only when there is not sufficient line available to affect a full replacement.
In an emergency, used line can be used to make the splice. This type of repair is not acceptable for
repairs on certificated canopies.
1.0 DISASSEMBLY:
1.1 Lay out the canopy and straighten the lines.
1.2 Inspect the line to determine the damage.
2.0 REASSEMBLY:
2.1 For an internal splice, take a piece of line approximately
12" longer than the damaged area.
2.2 Using a finger-trapping needle or wire, finger-trap a section
of line inside the damaged area so that it overlaps the damaged
area a minimum of 3" in each direction. Make sure the
ends of the line are cut on a taper [Figure A].
2.3 Use the zigzag machine to overstitch the damaged area a
minimum of 1" on each end [Figure B].
2.4 For a joining splice, mark each end of the separated line with
two marks. The first mark is made at 10" from the end and
the second mark is placed at 16" from the end. Trim the ends
with a hot knife.
2.5 Next take a piece of line for the splice approximately 36"
long. Trim one on an angle with the hot knife. Mark one end
of the line at 10" and 16".
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