11. Check the tension of the new partial panel piece  against the edges of the other panels that formed the  original seam. They should all be equal.  [Figure K] •  Applicable products: square canopies; main and  reserve •  Description: Rib repair on a square canopy •  Authorized repairmen: FAA Master Parachute  Rigger —mains and reserves; FAA Senior Parachute  Rigger—mains  •  Materials: E thread; fabric—type and color to match,  reinforcing tape—type and color as per original •  Machines: 301 dtraight dtitch—medium duty 7–11  SPI, 1 inch × 42 stitch bar tack, double needle with  puller attachment (optional) and SPI to match original •  Equipment: Scissors, seam ripper, marking pencil,  ruler, pin board, straight pins, and patching square Square Canopy—Rib Repair Procedure Repairing a rib of a square canopy is similar to doing a  partial panel repair. The biggest difference comes when the  rib is either: 1.  A “loaded” rib or one with support tapes for the line  attachment points, or  2.  A crossport is damaged and needs to be repaired  and recut. In this case, the crossport area needs  replacement.  [Figure A] 12. Refold the original seam with the three panel edges and  stitch as per the original seam.  [Figure L]  Overstitch  a minimum of 2 inches on each end. 13. If a line attachment has been removed for the repair,  the tab must be replaced. Make sure that the line/tab  does not have a twist in it. Locate it at the correct  location and reattach as per original. Disassembly Inspection 1.  Determine the extent of the damaged area and unpick  the top and bottom seams to access the rib.  [Figure B] In most cases, restitching the rib to the top and bottom  panels is fairly straightforward. Because of this,  opening up the seam for a good distance (18 inches  plus either side of the proposed patch) allows easier  access and sewing. 2.  Pin the damaged rib to the pin board to stabilize the  material for marking. Mark out the damaged portion  of the panel, following the weave of the fabric.  •  Check the fabric tension of the replaced panel. It  should be equal to that in the remainder of the cell. •  Spanwise reinforcing tape should be straight and sewn. •  Seams should be folded correctly and thread tension  even along both rows of stitching. •  Line should be attached correctly and have no twists. 7-25 Change 1 (December 2015)