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Some methods are covered with older processes and procedures of repair; some include the newest methods as are used by most riggers today. All methods are acceptable to provide a safe and airworthy repair, but it should always be the focus of the rigger to understand all methods and strive to utilize the best possible technique to allow for repairs to be completed to the highest possible standards. 

## Seam Restitching 

• 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 stitches per inch (SPI), 308 zigzag—medium duty 7–11 SPI 

• Equipment: Scissors, seam ripper 

## Procedure 

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. Inspect the damaged thread or seam area. If the thread is merely broken or frayed, overstitch the seam with a minimum of 4 to 6 inches at each end. 

2. If the seam is gathered or bunched up, 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 4 to 6 inches at each end. 

[Figure A and  Figure B] 

<img src='content_image/590644.jpg'>

<img src='content_image/590646.jpg'>

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. 

4. For zigzag stitching, such as on suspension lines, a .25 inch overstitch on each end is standard. [Figure C] 

<img src='content_image/590645.jpg'>

## Inspection 

• Check that the seam tension and stitch length match the original. Make sure to check top and bottom. 

• 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. 

• On radial seams, slide the seam material up and down over the tape or line to check for free movement. 

