MIL-DTL-9401C
the load. Care shall be exercised in preparing proper line-measuring equipment. Equipment
such as pulleys, guides, and reels, if used, shall not induce false loads on the material nor uneven
load distribution on multiple line- measuring systems. Reasonable care shall be exercised to
maintain uniformity in time control of load applications and control of large changes in
temperature and humidity. Lines measured after attachment may have a variation in length of 1
percent in any one canopy when measured under tension in accordance with table III.
Table III. Tensile strength and tension
Tensile strength (pounds)
Tension (pounds)
100 to 500
10 + 1/2
500 to 1000
20 + 1
1000 and up
40 + 2
3.3.12.3 Webbings. Webbings, tapes, and ribbons used in assembling the drag surface shall be
measured with no tension applied during the measuring operations. Very heavy webbings shall
not be measured while in the stretched state. (The stretched state of webbing is caused by
winding the webbing onto the spool while the webbing is under tension.) A uniform period of
time shall be maintained between load applications and marking.
3.3.12.4 Drag surface. When finished dimensions are specified, proper allowance shall be
provided for stitching take- up to obtain the finished dimensions when the specified tolerances
under any condition of humidity. Unless otherwise specified in the detail specification, all
finished dimensions shall be measured on the finished drag surface under nominal tension within
15 seconds after application of the nominal tension. See MIL-STD-849 for the definition of
nominal tension.
3.3.13 Stitches. The number and the spacing of stitches shall be measured under a tension of not
less than ½ pound nor more than 1 pound.
3.3.14 Tolerances. Unless otherwise specified, the tolerances for dimensions shall be as
specified in table IV.
Table IV. Tolerances for dimensions
Dimension (inches)
Tolerances
1/16
+ 1/32
Under 2 but over 1/16
+ 1/16
2 to 10
+ 1/8
10 to 30
+ 1/4
30 to 60
+ 3/8
60 and up
1/
1/ The tolerance is 1 percent of the dimension.
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