Note: The repair described in the following procedure is a major tear across the bottom surface of the canopy and includes damage to a non-load-bearing rib.


1.1 Determine the extent of the damage. Mark out the damaged area across the panel, following the weave of the fabric. Unpick the loaded seams that hold the damaged fabric for at least 8- 10" past the damage area mark. It is always easier to unpick more of the seam to allow better access to the damaged area. Restitching the seam is one of the easiest operations. Fighting the canopy is not.

  1.1.2 Unpick the non-loaded seam the same distance as the loaded seams.

  1.1.3 Lay the canopy on the floor, take the pin board or cardboard box and position it under the damaged area. Take the scotch tape and tape the raw edges of the tear together to stabilize the panel [Figure A].

  1.2 Mark a line on the fabric at least 2" from the damage area [Figure C] on both sides of the damaged panel.


  2.1 Cut a piece of fabric approximately 6" wider and longer than the damaged panel area. Make sure that one of the edges is straight and even with the weave of the fabric. Trim one of the adjacent sides at 90 degrees to the straight edge.

  2.2 Mark a line parallel to the straight edge at .75" from the edge. Center the new panel on the damaged one. Fold the fabric on this line and pin in place along the damage line [Figure D]. Smooth the new panel fabric over the damaged panel to the opposite side. Trim the new panel .75" longer than the damage line. Fold the fabric at the line and pin in place [Figure E].



  2.3 Check the tension of the two panels. They should be equal.

  2.4 Take a straightedge and mark the location of the spanwise reinforcing tape [Figure F].

  2.5 Sew the panel along the outer edge at .12" from the folded edge.

  2.6 Turn the panel inside out. Trim the damaged panel at .62" from the edge of the panel edge [Figure G].

  2.7 Fold the fabric under to create a French fell seam. Sew a stitch row .12" from the folded edge.

  2.8 Sew a piece of reinforcing tape on the bottom of the replacement panel along the line for the spanwise reinforcing tape [Figure H].

  2.9 Repair the non-load-bearing rib with a three-sided patch [Figure J].

  2.10 Draw a line along the edge of the partial panel on each side from the point where the old panel meets the new one. Trim the fabric along this line [Figure K].

  2.11 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 L].

  2.12 Refold the original seam with the three panel edges and stitch as per the original seam [Figure M]. Overstitch a minimum of 2" on each end.

  2.13 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.


  3.1 Check the fabric tension of the replaced panel. It should be equal to that in the remainder of the cell.

  3.2 Spanwise reinforcing tape should be straight and sewn.

  3.3 Seams should be folded correctly and thread tension even along both rows of stitching.

  3.4 Line should be attached correctly and have no twists.


 ŠAvStop Online Magazine                                                                                                                                                       Contact Us              Return To Books

AvStop Aviation News and Resource Online Magazine

↑ Grab this Headline Animator