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2.8 Working downward, mark the location of the chest strap, the ripcord pocket, and the bottom
of the upper leg strap [Figure G]. NOTE: It will be necessary to allow for a certain amount of
shrinkage during the sewing process. There will be four areas of shrinkage to allow for:
1. The harness stitching at the 3-ring.
2. The harness stitching at the chest strap.
3. The ripcord pocket.
4. The harness stitching at the leg strap junction.
The standard rule of thumb for the sum of these patterns
is approximately .75" for the length. In other words, the
marked length of the MLW should be .75" longer than
the desired finished length. Most of the shrinkage will
be in the ripcord pocket and the leg strap junction. If the
rigger has not done this operation before, he/she may
want to build a sample MLW to check the measurements
and the resultant shrinkage.
7-72
2.9 Sew the Velcro® in place for the ripcord pocket [Figure H].
2.10 Glue the chest strap in place. In this instance, don’t forget the housing loop.
2.11 Using the single needle, pre-sew the front and rear main lift webs. Use of the sewing pattern
in Figure J will accomplish this and at the same time will create the ripcord pocket. Sew the
chest strap 3-point W-W with the harness machine [Figure K].
2.12 Reassemble the upper diagonal back strap and the
3-ring hardware by threading the rear riser through
the large ring followed by the front riser.
2.13 Position the 3-ring at the mark on the main lift web and glue in place. Install the Ty-12 confluence
wrap below the 3-ring and mark the 4-point W-W pattern [Figure L].
2.14 Sew the confluence wrap with the harness machine [Figure M].
2.15 Re-create the leg junction. Glue the upper leg strap in place first and then the horizontal back
strap second [Figure N].
LEFT
3-RING 1
3 2
4
5
7
9
10
11
8
6
RIPCORD
POCKET
VELCRO BOTTOM OF
RIPCORD
POCKET
TOP OF
RIPCORD
POCKET
Figure J
2.16 Mark the 4-point W-W and then sew with the harness
machine. Start the stitch pattern at the front
side of the MLW and complete with the overstitch
the full length of the pattern [Figure O]. This will
provide additional reinforcing at the upper leg
strap/MLW location.
2.17 Measure the length of the lower leg strap allowing
3.50" for the rolled stop end. Trim to length and
then install the stop end with the harness machine.
2.18 Reattach the backpad to the upper MLW using the
308 zigzag machine.
2.19 Reinstall the leg pads using the 308 zigzag machine.
2.20 Reinstall the ripcord and 3-ring housings and hand tack in place.
3.0 INSPECTION:
3.1 Check the finished dimensions against the original dimensions in Figure A. If only one side
has been replaced, check the new MLW against the opposite side for comparison. The generally
accepted tolerances for this type of construction are ± .25". In particular, reserve riser
length and the overall MLW length are the most important. If either of these are mismatched
to their opposites, then the flight of the canopies may be affected.
3.2 Start inspecting from the riser end working down. Use the inspection chart in Figure P as a
guide for the inspection points.
After the inspection, all appropriate paperwork must be completed. This includes the rigger’s
logbook, the packing data card for the parachute, and any shop or business forms or log.
7-73
Figure P
7-74
Parachute Repair Procedure
TITLE: 7.3.6 Main Riser 3-Ring Locking Loop Replacement
NUMBER OF PAGES: 2
APPLICABLE PRODUCTS: All 3-ring riser assemblies.
DESCRIPTION: Replacement of the 3-ring riser locking loop.
AUTHORIZED REPAIRMEN: FAA Senior or Master Parachute Rigger
MATERIALS: E thread
5-cord nylon thread—color to match
Ty-IIa nylon cord or equivalent
MACHINES: 308 Zigzag—Medium Duty 10 SPI
Heavy-duty harness machine—Singer 7-33 or equivalent
EQUIPMENT:
Scissors
Seam ripper or scalpel
Marking pencil
6" ruler
Glue gun
Hot knife
PROCEDURE
1.0 DISASSEMBLY:
1.1 Mark the locking loop at the bottom edge of the confluence
wrap [Figure A].
1.2 Place a mark at the bottom of the confluence wrap and
carefully remove the confluence wrap from the riser.
1.3 Remove the old locking loop.
2.0 REASSEMBLY:
2.1 Cut a new loop the length of the old one plus 2.00".
2.2 Fold the new loop in half and lay alongside the old loop. Transfer the marks from the old
loop to the new one [Figure B].
2.3 Align the marks on the loop with the mark at the bottom of the confluence wrap on the riser
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Parachute Rigger Handbook(91)
