TM 10-1670-272-23&P                                                       0012 00 UNIT MAINTENANCE MC1-1B/MC1-1E TROOP BACK PARACHUTE ASSEMBLY   SEWING PROCEDURES 0012 00-1 THIS TASK COVERS:    Basting and Temporary Tacking    Stitching and Restitching    Darning    Zig-Zag Sewing    Patching INITIAL SETUP: Equipment Condition Unpacked.  Canopy with defects recorded.   Clean. Tools Specified in paragraph applicable to the item being repaired. Personnel Required 92R(10) Parachute Rigger Materials/ Parts Specified in paragraph applicable to the item being repaired.   References WP 0014 00 NOTE Sewing requirements will vary according to the type of item being repaired and the type of repair being made.  The type of sewing machine, type of thread, the stitch range, and the stitch pattern (if applicable) required to accomplish a sewing procedure will be specified in the paragraph applicable to the item being repaired.  All original stitching that is cut during the performance of a sewing procedure will be removed from the applicable item.  Immediately after the accomplishment of a machine sewing procedure, trim thread ends to a point as close as possible to the material that has been sewn. NOTE Repair and replacement of parachute components is performed in accordance with the general repair instruction in this section and in specific paragraphs applicable to the item being repaired.   Fabrication is a means of replacing an air delivery item component that is damaged beyond repair and not an issue item.  Though the act of fabrication is a replacement-type action, the function is actually a method of repairing an end item.  Since most fabrication pertains to components that are peculiar to parachutes, the fabrication of components that are most general in nature will be detailed in the following paragraphs.