MIL-STD-849B
TABLE III. Classification of defects - solid and extended skirt parachute canopies - personnel - Continued.
Classification No. Defect Major/Critical Minor
1 stitch per inch over or under the number specified, over 2
inches long (size 3 through 6 thread) 175
More than 1 stitch per inch over or under the number specified
(size 3 through 6 thread) 176
2 stitches per inch over or under the number specified, up to 2 inches long and one place per seam
(size B through FF thread) 245
2 stitches per inch over or under the number specified,
over 2 inches long (size B through FF thread) 177
More than 2 stitches per inch over or under the number
specified (size B through FF thread) 178
NOTE: For B or E size thread only, up to 14 stitches per inch, type 301 or 401 stitches in accordance with ASTM D 6193, will be allowed for a length not over
2 inches in any one place with a minimum distance between locations of 12 inches. Over 14 stitches, or
14 stitches more than 2 inches long or less than
12 inches apart, shall be classified a major defect.
NOTE: When a double thickness or more occurs in fabric being sewn or where pressure must be applied by an operator to sew over reinforcement tapes and webbings, the number of stitches per inch defects will be classified as follows: within the major defect category, minor defect; and within the minor defect category, no defect.
NOTE: When the end item specification forbids repair to defective stitching, it shall be classified as a major defect.
Broken or missing stitches
Up to 1/4 inch 179
Over 1/4 inch 180
2 or more consecutive skipped stitches 181
Missing or incomplete stitch pattern
(for example, bartack or zigzag) 182
Backstitch missing 183
Backstitch short
Less than 1/4 inch 246
More than 1/4 inch 184
Runoff, 2 or more stitches into single cloth or beyond seam
or hem margins 185
Up to 1/4 inch 247
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