best rule of thumb to follow is this: If the component is part  of the approved assembly, then it is probably not something  that may be manufactured in the field. The common exception  to this rule is the reserve closing loop. The rigger who is undertaking the manufacture of these  components needs to have, at the minimum, the following  sewing machines: medium duty, single-needle, double needle  machine with a binding attachment and a zigzag machine. In  addition, the rigger needs grommet setting tools and a basic  selection of webbings, materials, and fabrics. The following are outlines of construction procedures for  the manufacture of the listed items found in Section 6,  Manufacturing: 7.  Remove the CYPRES $^{®}$ from the container completely.  Position the elastic sleeve to the marks and sew in  place with the zigzag machine.  [Figure N] •  Main and reserve closing loop manufacture •  Main deployment bag •  Bottom of Container (BOC) pocket 8.  Re-close the corner of the reserve container as per  the original. •  Applicable products: All harness and containers that  utilize a fabric closing loop configuration •  Description: Fabrication of fabric closing loops •  Authorized repairmen: FAA Senior or Master  Parachute Rigger  •  Verify the CYPRES$^{®}$ pocket is sewn with the  Spandex$^{®}$ pocket centered on the wall. •  Control cable channel must be installed. •  Control unit pocket must be installed. •  Cutter cable channel must be installed. •  Cutter elastic must be installed. •  Materials: E thread, loop material—725# Spectra ® •  Machines: 301 straight stitch—medium duty 7–11  SPI, 308 zigzag—medium duty 7–11 SPI, and 1 inch  × 42 stitch bar tack (optional) •  Equipment: Scissors, seam ripper or scalpel, marking  pencil, 18-inch ruler, hot knife, finger-trapping needle  or fid, and finger-trapping wire •  Verify the reserve container corner is closed,  as necessary. •  Check the fit of CYPRES $^{®}$ in the entire installation. •  Log installation data on the packing data card.  Remember, this is an alteration. Main and Reserve Closing Loop Manufacture Inspection Section 6, Manufacturing Procedure Preparation: 1-Pin Loop The terms “locking loops” and “closing loops” are  synonymous and used interchangeably. Fabric locking  loops have become the preferred method of closing most  modern parachute containers. Dating from the mid 1970s,  the most common material was Type-III suspension line. It  was soon recognized that other materials, such as Dacron$^{®}$  were superior for this use. Today, Spectra $^{®}$ is widely used for  reserve locking loops while Dacron$^{®}$ has remained preferred  for main loops due to its durability. The following technique  demonstrates the fabrication of a 1-pin and a 2-pin loop. There might come times when it is more practical for the  rigger to manufacture replacement parts in order to return a  system to operation. The items listed in this section are those  that are either main component parts or the reserve closing  loop, which is simple to make and usually within the purview  of the senior rigger to do so. It is important for the rigger to  recognize just what parts are legal to make. One item some  riggers make, but one in which they are not usually approved  to do so, is the Safety Stow™ for the reserve free bag. As  part of the TSO-C23d component, it is manufactured from  approved materials and under an approved Quality Control  system. As simple as this item is, if it is not manufactured  according to the original configuration. There is a very good  chance for a failure of the reserve deployment system. The  1.  Measure the length of the original loop. If the stop  knot is too tight to untie, allow extra length (you can  always cut it down, but you cannot glue it back on). 7-80