Table 2-2. Sewing Machine Code Symbols

ARMY TM 10-1670-278-23&P AIR FORCE T.O. 13C5-26-2 NAVY NAVAIR 13-1-27 b. Stitching and Restitching. Perform stitching and restitching as follows, referring to tables 2-2 and 2-3: (1) Parachute canopy assemblies. The stitching and restitching made on parachute canopies should be accomplished with thread that is contrasting in color to the fabric being restitched. If contrasting color thread is not available, thread of matching color may be used, providing all other specifications are met. Straight stitching and restitching on parachute canopy assemblies should be locked by at least 2 inches at each end of a stitch row, when possible. 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. When restitching parachute canopy assemblies, stitch directly over the original stitching and follow the original stitch pattern as closely as possible. Table 2-2. Sewing Machine Code Symbols. Code symbol Sewing machine LD SEWING MACHINE, INDUSTRIAL: General sewing; 301 stitch; light duty; NSN 3530-01-177-8590. MD ZZ SEWING MACHINE, INDUSTRIAL: Zig-zag; 308 stitch; medium duty; NSN 3530-01-181-1421. LD ZZ SEWING MACHINE, INDUSTRIAL: Zig-zag; 308 stitch, light duty; NSN 3530-01-181-1420. HD SEWING MACHINE, INDUSTRIAL: General sewing; 301 stitch; heavy duty; NSN 3530-01-177-8588. MD SEWING MACHINE, INDUSTRIAL: General sewing; 301 stitch; medium duty, NSN 3530-01-177-8591. DN SEWING MACHINE, INDUSTRIAL: Darning; lock stitch; NSN 3530-01-177-8589. LHD SEWING MACHINE, INDUSTRIAL: 301 stitch; light heavy duty; NSN 3530-01-186-3079. ND SEWING MACHINE, INDUSTRIAL: 301 stitch; double-needle; NSN 3530-01-182-2873. Table 2-3. Stitching and Restitching Specifications. Recommended sewing machine Stitches Thread Component (code symbol) per inch size Canopy Gore panel LD 7-11 E DN Darn E Panel edge reinforcement LD 7-11 E 2-49