MIL-DTL-44427A
3.3.1.1 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 from the defective area, (1/2 inch
for box-x and W-W stitching), from the end of the stitching.
b. Thread breaks or two or more consecutive skipped or run-of 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.
3.3.1.2 Type 401 stitching. Thread tension shall be maintained so that there will be no
loose stitching. Both ends of all seams or stitching produced with 401 stitch type, when not
turned under in a hem or held down by other stitching, shall have a ½ to ¾ inch chain extending
beyond each end. The looper (underthread) shall always be on the inside of fabric assemblies. All
repairs shall be made in accordance with 3.3.1.1a or 3.3.1.1b. Repairs may be made using stitch
type 301.
3.3.1.3 Bartacking. Bartacking shall be free of thread breaks and loose stitching.
3.3.1.4 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.
3.3.1.5 Thread ends. All thread ends shall be trimmed to a length of not more than ¼
inch.
3.3.1.6 Thread lubricant. There shall be no lubrication of the thread on the tent and fly
prior to or during the sewing operation.
*3.3.2 Setting of grommets. Holes punched to receive grommets shall be smaller than the
outside diameter of the grommet barrel so that the barrel must be forced through the hole.
Grommets shall be securely clinched without cutting the materials. Roll of the clinched grommet
shall not contain more than three scores (splits).
3.3.3 Wicking of sewing thread. There shall be no wicking of water through the tent
body or fly stitching when the tent is tested as specified in 4.4.5. The cup test is intended to
insure that non-wicking thread has been utilized and that no lubrication has been added to the
thread prior to or during the sewing operation.
3.3.3.1 Leaking of taped seams. There shall be no leakage of water through seams
requiring seam tapes when the tent is tested as specified in 4.4.5.
*3.4 Repairs to liner assembly fabric. All necessary repairs shall be effected in accordance
with the Department of The Army Field Manual FM 10-16 except that hand sewn patches, other
than specified herein, will not be acceptable. Patches on holes, cuts or tears not more than 1 inch
in diameter or length shall be permitted. A maximum of one patch per liner assembly shall be
allowed without prior authorization from the contracting officer. Each patch shall be large
enough to overlap the damaged area with a margin of at least ¾ inch on all sides. Patches shall be
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