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Table 2-3.  Stitching and Restitching Specifications - TM-10-1670-281-23P_149
Figure 2-103.  Darning Method Using a Darning Sewing Machine

TM-10-1670-281-23P Parachute Cargo Type: 64-Foot Diameter Model G-12D NSN 1670-00-893-2371 and Model G-12E NSN 1670-01-060-3705 Manual
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ARMY TM 10-1670-281-23&P AIR FORCE T.O.  13C5-32-2 NAVY NAVAIR 13-1-32 Table 2-3.  Stitching and Restitching Specifications (cont). Recommended sewing machine Stitches Thread Code symbol (code symbol) per inch Size Pilot Parachute (68-lnch Diameter) Canopy panel LD 7-11 E DN Darn E Crown inside reinforcement tape LD 7-11 E Canopy reinforcing tape LD 7-11 E Crown attaching loop LD 7-11 E Skirt reinforcement webbing LD 7-11 E Suspension line reinforcing tape ZZ 7-11 FF LD 7-11 E Suspension line ZZ 7-11 E Static Line Edge binding LD 7-11 E Bag panel DN Darn E Bridle line ZZ 7-11 E Bridle webbing HD 5-8 3 Tiedown loop LD 7-11 E (2)   Other  parachute  items.   Stitching  and  restitching  on  other  parachute  items  constructed  from  cloth, canvas,  and  webbing  should  be  accomplished  with  thread  which  matches  the  color  of  the  original  stitching, when possible.  All straight stitching should be locked by backstitching at least 1/2 inch.  Restitching should be locked by overstitching each end of the stitch formation by 1/2 inch.  Zig-zag stitching does not require locking; however,  zig-zag  restitching  should  extend  at  least  1/4  inch  into  undamaged  stitching  at  each  end,  when possible.  Restitching should be made directly over the original stitching, following the original stitch pattern as closely as.  possible: c.  Darning.  (Refer to tables 2-2 and 2-3).  Darning is a sewing procedure used to repair limited size holes, rips, and tears in assorted air delivery items constructed from textile material such as parachute canopy gore sections and the cloth and reinforcement webbing of deployment bags.  A darning machine should be used to darn small holes and tears where fabric is missing.  Darning of previously patched material can be performed provided  darning  size  limitations  prescribed  in  the  paragraph  applicable  to  the  item  are  not  exceeded.    A darning repair will be performed using the following procedures: (1)  Using an authorized marking aid of contrasting color, mark a square around the damaged area and ensure that the marking is at least 1/4 inch back from each edge of the damaged area.  The marking will be made with the warp and the filling of the material. (2)  Darn the damaged area by sewing the material in a back-and-forth manner, using size A or E nylon thread, allowing the stitching to run with the warp or filling of the fabric (A, figure 2-103). 2-109







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