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7.1.12 Square canopy—Crossport repair
7.1.13 Square canopy—Trim check and retrim
SQUARE CANOPY REPAIRS AND LIMITATIONS
Type
Limits
Certificated Non-certificated
Restitching No limit as to length and number. No limit as to length and number.
Ripstop tape Not allowed. No limit as to size or number.
Basic patch Size limit: 50% of panel or rib.
Limit: 3 per cell panel,
15 per canopy.
No limit as to size or number.
Panel patch Limit: 1 per canopy. No limit.
Suspension
lines
No limit. No limit.
Line splice Not allowed. Limit: 1 per line. 8 per canopy.
rigger should consult with the proper manufacturer’s
manual for what repairs are allowed on that particular
canopy.
Figure 7-2 shows a table of square canopy repairs and
limitations. These are for reference only and not all
manufacturers allow the same types of repairs. The
Figure 7-2.Table of square canopy repairs and limitations.
Parachute Repair Procedure
TITLE: 7.1.1 Seam Restitching
NUMBER OF PAGES: 1
APPLICABLE PRODUCTS: All canopies; round and square; main and reserve.
DESCRIPTION: Replacement of broken or damaged seam threads.
AUTHORIZED REPAIRMEN: FAA Senior or Master Parachute Rigger
MATERIALS: E thread—color to match original
MACHINES: 301 Straight Stitch—Light Duty 7-11 SPI
308 Zigzag—Medium Duty 7-11 SPI
EQUIPMENT:
Scissors
Seam ripper
PROCEDURE
1.0 On lightweight material, the rigger should first set up the machine with similar material and
thickness to set the tension of the machine before sewing the actual parachute.
1.1 Inspect the damaged thread or seam area. If the thread is
merely broken or frayed, overstitch the seam with a minimum
of 1.25" at each end.
1.2 If the seam is gathered or bunched up [Figure A], it may be
necessary to cut the thread in order to smooth out the seam
and then overstitch the damaged area with a minimum of
1.25" each end [Figure B].
1.3 If the restitching was done on a radial seam of a round
canopy, which has a tape or suspension line within the seam,
make sure you did not catch the tape or line in the stitching.
1.4 For zigzag stitching, such as
on suspension lines, a .25"
overstitch on each end is standard
[Figure C].
2.0 INSPECTION:
2.1 Check that the seam tension and stitch length match the original. Make sure to check top and
bottom.
2.2 Make sure that you have not captured any adjacent fabric in the seam. This is a common mistake
on square canopies where you may have three panels joining together.
2.3 On radial seams, slide the seam material up and down over the tape or line to check for free
movement.
7-5
7-6
Parachute Repair Procedure
TITLE: 7.1.2 Canopy Ripstop Tape Repair
NUMBER OF PAGES: 2
APPLICABLE PRODUCTS: All main canopies. Reserve canopies as specified by the manufacturer.
DESCRIPTION: Using ripstop tape for temporary or minor canopy repairs.
AUTHORIZED REPAIRMEN: FAA Senior or Master Parachute Rigger
MATERIALS: Ripstop tape—color to match fabric
E thread—[Optional]
MACHINES: 301 Straight Stitch—Medium Duty 7-11 SPI [Optional]
EQUIPMENT:
Scissors
Shot bags
Wallpaper roller
Scotch tape (optional)
PROCEDURE
1.0 Note: Ripstop tape has in the past been a commonly used repair material. Time has shown,
however, that the adhesive used can be detrimental to the strength of the fabric over the long
term. Consequently, most manufacturers do not recommend its use on certificated canopies.
In addition, some of the modern, coated fabrics do not accept the use of the ripstop tape without
additional sewing to help hold it in place.
1.1 Spread out the canopy on a smooth surface.
1.2 Smooth out the damaged area and hold in place with the
shot bags [Figure A].
1.3 Inspect the damaged area.
1.4 Trim any loose threads and smooth any loose fabric back
into place.
1.5 For small holes, a single-side patch will suffice. For holes up to .5" in diameter, or a tear, a
double-sided patch is necessary.
1.6 If the damage is a tear, the two sides must be positioned so the edges touch. Use scotch tape
to temporarily hold the edges together [Figure B].
1.7 For a hole, cut a piece of ripstop tape 2" square. For a double-sided patch, cut two pieces
[Figure C]. For a tear, cut the tape approximately 2" longer than the length of the tear and cut
two pieces.
1.8 For the single-side patch, round the corners with approximately a 1/8" radius. For the double-
sided patches, place the two pieces face to face and round the corners of both pieces at
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Parachute Rigger Handbook(70)
