TM 10-1670-298-20&P
Table 2-3. Stitching Specifications
Component
Recommended
Sewing Machine
(Code Symbol)
Stitches
Per
Inch
Thread
Size
A-21 Cargo Bag'
Cover
MD
7 to 11
E
Strap Keeper
DN or ZZ
Darn
E
Sling
Scuff Pad
MD
7 to 11
E
DN or ZZ
Darn
E
V-Ring Hole Reinforcement
MD
7 to 11
E
Main Strap Keeper
HD
5 to 8
3
Sling Strap and Loop
HD
5 to 8
5
Quick-Release Strap
HD
5 to 8
5
Safety Clip Retaining Strap
MD
7 to 11
E
Strap with Ring
HD
5 to 8
5
A-22 Cargo Bag
Cover
HD
5 to 8
3
Cover Lacing Loop Strap
HD
5 to 8
5
Sling Assembly
Scuff Pad
HD
5 to 8
3
DN or ZZ
Darn
E
Scuff Pad Edge Reinforcement
HD
5 to 8
3
Support Web
LHD or HD
5 to 8
5
Lateral Strap
LHD or HD
5 to 8
5
Tie-down Strap
LHD or HD
5 to 8
5
Suspension Web
VHD
5 to 8
6
f.
Darning and Zigzag Sewing Repairs.
(1) Darning.
Darning is a sewing procedure used to repair limited size holes, rips, and tears in assorted
airdrop items constructed from textile material such as parachute canopy gore sections and the cloth and
reinforcement webbing of deployment bags, packs, and cargo. A darning repair may be made either by hand
or sewing machine, depending upon the method preferred and the availability of equipment. However, a
darning machine should be used to darn small holes and tears where fabric in missing. Darning of previously
patched material can be performed provided darning size limitations prescribed In the applicable item
equipment publication are not exceeded. A darning repair will be performed using the following procedures,
as appropriate:
(a) Machine Darning.
1
Using an authorized marking aid of contrasting color, mark a square around the damaged area and
insure that the marking is at least ¼-inch (0.635 cm) back from each edge of the damaged area.
The marking will be made with the warp and filling of the material
2
Darn the damaged area by sewing the material in a back and forth manner, allowing the stitching to
run with the warp or filling of the fabric (A, Figure 2-1).
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