MIL-DTL-27893F (GL)
environmentally preferable materials should be used to the maximum extent possible provided the
material meets or exceeds the operational requirements, and promotes economically advantageous
life cycle costs.
3.4 Construction. The construction shall conform in all respects to the drawings listed in
section 2 and all subsidiary drawings pertaining thereto, and as specified herein.
3.4.1 Stitching, machine. All machine stitching shall be as specified on the applicable
drawings and as specified herein.
3.4.1.1 Types 301 and 308 stitching. Ends of all type 301 stitching shall be backstitched or
overstitched not less than 1/2 inch in accordance with the required stitch pattern. Ends of type
308 stitching shall be secured by crowding a minimum of three stitches (accomplished by not
allowing the materials to move) at the beginning and end of the stitching. Thread tension shall be
maintained so that there will be no loose stitching resulting in the puckering of the material sewn.
The lock shall be embedded in the materials sewn.
3.4.1.1.1 Repairs of type 301 stitching. Repairs of type 301 stitching shall be as follows:
a. When thread breaks or bobbin run-outs occur during the stitching, the stitching shall
be repaired by restarting the stitching a minimum of 1 inch (1/2 inch for box-x and W-W stitching)
from the end of the stitching. 1/
b. Thread breaks or two or more consecutive skipped or run-off stitches noted during
inspection of the item (in-process or end item) shall be repaired by overstitching. The stitching
shall start a minimum of 1 inch from the defective area, (1/2 inch for box-x and W-W stitching),
continue over the defective area, and continue a minimum of 1 inch (1/2 inch for box-x and W-W
stitching) beyond the defective area onto the existing stitching. Loose or excessively tight
stitching shall be repaired by removing the defective stitching, without damaging the materials,
and restitching in the required manner. 1/
1/ When making the above repairs, the ends of the stitching are not required to be backstitched.
3.4.1.1.2 Repairs of type 308 stitching. Repairs of type 308 stitching shall be in accordance
with 3.4.1.1.1a and 3.4.1.1.1b, except that the stitching shall overstitch the defective area a
minimum of three stitches onto the existing stitches.
3.4.1.2 Automatic stitching. Automatic stitching machines may be used to perform any of the
required stitch patterns provided the requirements for the stitch pattern, stitches per inch, and size
and type of thread are met, and at least three or more tying, overlapping, or back stitches are used
to secure the ends of stitching.
3.4.2 Thread ends. All thread ends shall be trimmed to a maximum length of 1/4 inch.
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