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Figure 2-42.  Patch Application, Stitch Method
Figure 2-44.  Gore Section 1, Replacement Details

TM-10-1670-276-23P Parachute Cargo Type: 26-Foot Diameter High-Velocity Cargo Parachute NSN 1670-00-872-8109 Manual
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ARMY TM 10-1670-276-23&P AIR FORCE T.O.  13C5-29-2 NAVY NAVAIR 13-1-29 2-24.  Gore Section (cont). (c)   Pressure-sensitive (iron-on) patch.   This method of applying a basic patch is a heat and pressure (iron-on) technique  using  pressure-sensitive-coated  cotton  balloon  cloth.    This  method  is  limited  to  use  on  the  cotton  muslin canopies  such  as  the  26-foot  cargo  parachute.    A  complete  canopy  section  replacement  will  be  performed  when  an individual section has been patched extensively with the pressure-sensitive patch material and an apparent stiffening of the  section  occurs.    The  stiffening  effect  may  adversely  affect  the  proper  layout  and  packing  of  a  parachute  canopy. Apply a pressure-sensitive (Iron-on) patch as follows: 1 Smooth all wrinkles from material surrounding the damaged area. 2 Cut a piece of pressure-sensitive-coated cotton balloon cloth large enough to extend 1 Inch beyond all edges of  the  damaged  area  If  damaged  area  extends  to  a  point  within  1  inch  of  upper  lateral  band,  only  a  sewn patch as outlined In (b), above, will be allowed. 3 Place  coated  cloth  patch  over  damaged  area  with  adhesive  side  facing  down.    If  damaged  area  has  no material missing, patch will be applied to the Inside of canopy only.  Whenever damaged area has a space between the edges of material which indicates that material is missing, patch will be applied to both inside and outside of canopy (figure 2-43). 4 Using   a   household-type   electric   iron   with   heat   regulated   for   cotton   material,   apply   heat   and   pressure simultaneously to patch material for at least 30 seconds.  Insure that all of patch material is subjected to heat and pressure, and that all edges of patch have adhered to canopy material.  Also Insure that temperature of iron  remains  constant  during  patch  application  effort  and  that  no  other  part  of  canopy  is  underneath  area being patched. (4)   Restenciling.  As required, restencil identification markings using procedures in paragraph 2-19. b.    Replacement.   When  replacing  gore  sections,  use  3.8  ounce  cotton  muslin  cloth  of  same  color  as  that  being replaced.    If  the  same  color  cloth  is  not  available,  another  color  may  be  used.    When  replacing  section  1  of  gore  1, restencil  gore  number  and  information  data  block  on  replacement  section.    For  other  gores,  stencil  gore  numbers  as necessary  using  procedures  in  paragraph  2-19.    A  gore  section  which  is  damaged  beyond  repair  will  be  replaced  as follows: (1)   Gore section 1. (a)   Cut a piece of 3 8 ounce cotton muslin cloth 2-1/2 inches longer and 1-1/2 inches wider than original gore section (figure 2-44) (b)   Place  cut  material  over  damaged  area  and  using  a  suitable  marking  device,  trace  outline  of  original  gore section, including width of radial tapes on each side of damaged area and width of skirt reinforcement tape (lower lateral band) at bottom.  Allow material to extend 1 inch beyond original gore section upper edge, 1- 1/2 Inches below lower skirt reinforcement tape, and 3/4 inch beyond outside edge of each of the radial tapes Trim excess material, as required. (c)   On upper end of cut material, make a double 1/2 inch-wide foldunder.  Secure foldunder with a single row of stitching sewn through foldunder center across width of material.  Stitching will be 7 to 11 stitches per inch. 2-68







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