0058 00  TM 10-1670-287-23&P  NOTE When sewing the rib, pull tension on the bottom or top skin as  required; however, let the rib material lay naturally to ensure the rib  and the nose of the canopy fit correctly. Make adjustments as  required using the guide marks made in step 1., above.  8.  If the rib being replaced is a loaded rib, start at the tail of the rib, fold and sew a second double row of  stitching using a double needle sewing machine, size E nylon thread and 7 to 11 stitches per inch.  9.  Starting at the tail end of the rib, fold and sew the top skin with a double needle sewing machine, size  E nylon thread and 7 to 11 stitches per inch.  10. If the rib being replaced is a loaded rib, start at the tail end of the rib, fold and sew a second row of  stitching using a double needle sewing machine, size E nylon thread and 7 to 11 stitches per inch.  11. Re-sew the tail seam as required, in accordance with original construction and stitch formation.  12. Re-sew any reinforcement tapes as required, in accordance with original construction and stitch  formation. NON-LOADED RIB SEAM, BOTTOM SKIN  LOADED RIB, BOTTOM SKIN  LOADED RIB, BOTTOM SKIN  NOTE When re-sewing the rib to the bottom skin, ensure that the  reinforcement tapes on the rib are centered on the reinforcement  tape running span wise. Ensure that the guide marks on the rib are  aligned with the guide marks on the bottom skin in the case of the  unloaded rib.  0058 00-2 