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Fabric locking loops have become the preferred method of closing most modern parachute containers.
Dating from the mid 1970s, the most common material was Type-III suspension line. It was
soon recognized that other materials such as Dacron® were superior for this use. Today Spectra® is
widely used for reserve locking loops while Dacron® has remained preferred for main loops due to
its durability. The following technique will demonstrate the fabrication of a 1-pin and a 2-pin loop.
1.0 PREPARATION: 1-Pin Loop.
1.1 Measure the length of the original loop. If the stop knot is too tight to untie, allow extra
length (you can always cut it down, but you can’t glue it back on).
1.2 Cut an appropriate length of material and hot knife one end on an angle.
2.0 FABRICATION:
2.1 Fold the line in half and mark
the center [Figure A].
2.2 Place a mark at 1" from the
center on the hot knifed end.
2.3 Take the finger-trapping fid
and screw it onto the hot
knifed end [Figure B].
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2.4 Insert the pointed end of the fid into the line at the farthest mark by separating the weave of
the material so that the fid then passes through the length of the braided line and out the scissor
cut end [Figure C].
2.5 Draw the line through until the two marks are aligned. This will result in a loop eye of
approximately .5" [Figure D].
2.6 Pinch the eye of the loop with one hand and smooth the material from the eye to the end. Hot
knife the running end.
2.7 For short loops used with a main container, simply tie an overhand knot in the loop for the
required length. A metal washer is used to keep the loop from pulling through the grommet
[Figure E].
2.8 If the loop is to be used with a reserve container, it may be
required to sew the finger-trapped part of the loop for
security. If this is the case, simply sew the length of the
finger-trapped portion of the loop with a single needle
machine before hot knifing the end. Start at the running
end and sew towards the eye of the loop. Stop sewing
approximately .12" from the eye and then backstitch a
minimum of 1" [Figure F]. Trim the end with the hot
knife.
3.0 FABRICATION: 2-Pin Loop.
3.1 Measure and mark the line according to Figure G. Cut
both ends with the scissors.
3.2 Using the finger-trapping wire, finger-trap one end to
form the loop and have the running end exit approximately
1" past the center mark [Figure H].
3.3 Repeat with the opposite end. Exit again past the center
so that the two lines overlap at the center [Figure J].
Center
Y X Y
A B C D
Enter Out Enter
X = Required Length + 2"
Y = 1/2 X + 2"
Finished Eye Size = 1/2"
Figure G
3.4 Pull the loop tight to remove any slack.
3.5 Bar tack or zigzag the loop ends [Figure K].
3.6 Trim the running ends [Figure L].
3.7 Bar tack or zigzag the center overlap junction [Figure M].
3.8 Measure the finished loop.
4.0 INSPECTION:
4.1 Check the loop length.
4.2 Verify stitching is secure and backstitched.
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Parachute Repair Procedure
TITLE: 7.6.2 Main Deployment Bag
NUMBER OF PAGES: 3
APPLICABLE PRODUCTS: All sport systems that utilize a main deployment bag.
DESCRIPTION: Fabrication of a main deployment bag.
AUTHORIZED REPAIRMEN: FAA Senior or Master Parachute Rigger
MATERIALS: E thread
Nylon para-pak fabric
Ty-3 3/4" nylon binding tape
Ty-1 9/16" nylon tape
Ty-4 1" nylon webbing
Ty-4 1 1/2" nylon webbing
Ty-12 nylon webbing
#3 Rolled rim spur brass grommets
#5 Rolled rim spur grommet
MACHINES: 301 Straight Stitch—Medium Duty 5-9 SPI
301 Double needle with tape folder 5-9 SPI
1" x 42 stitch bar tack
EQUIPMENT:
Scissors
Marking pencil
36" ruler
Carpenter’s square
Hot knife
#3 & #5 Spur grommet sets
Note: This procedure allows for either [1] duplicating an existing main bag, or [2] measuring a container
to determine the correct size bag required.
PROCEDURE
1.0 LAYOUT:
1.1 Measure the container according to Figure A or measure an existing bag according to Figure B.
Figure A
Figure B
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1.2 Transfer these dimensions to Figure C.
1.3 Lay out bag pattern on the para-pak according to
Figure C.
1.4 Cut para-pak and all required tapes and webbings.
2.0 ASSEMBLY:
2.1 Fold Ty-12 to center and sew to the inside of the
bag fabric at the top grommet location [Figure D].
2.2 Sew 1 1/2" Ty-4 tape at the outside tongue location
[Figure E].
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Parachute Rigger Handbook(99)
