The contents of this standard include: thick belts, sleeves, ropes, straps and rope sutures, a total of 17 categories and 49 standards. The standards not only specify stitch density, stitch length and stitch strength coefficient, but also specify materials, sutures and needles. This standard applies to the design of seams related to ropes and belts of parachutes (including empty targets and arresting nets).
HB 5879.9-1985 history
1985HB 5879.9-1985 Parachute Seam Cover with Lap Seam Triple Row Zigzag Stitch