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|  XIL-S-18313G
be made continuous. When machine stitching is not a continuous thread, it shall be back-
stitched at the l nds to prevent raveling, except when ends l re held down by other stitchings.
Thread tension shall be properly maintained and there shall be no loose stitches.
3.3.3.1 Stitching pattern.
3.3.3.1.1 Number size 4. When number size 4 nylon thread is utilized, mesh inter-
-
sections shall be l a specified in detail B, figures 3, 4, and 5, and shall be stitched in an
"x" pattern with two closed ends which shall be parallel to exposed edges of webbing.
shall be 6 to 7 stitches to the inch.
When number size 6 nylon thread is utilized, mesh inter-
3.3.3.1.2 Number size 6.
"x" pattern with two closed ends which shall be parallel to exposed edges of the webbing.
There shall be 4 to 5 stitches to the inch.
3.3.3.1.3 Letter size FF. When letter size FF nylon thread is utilized, mesh
intersections shall stiched in an "X" pattern with all ends closed and with two addi-
tional rows of stitching parallel to exposed edges of the webbing.re shall be 5 to 8
The
stitches to the inch.
3.3.3.1.4 Frame webbing and superimposed mesh webbings shall be stitched along both
edges of the webbings. Stitching at steel link corners shall go beyond the last web and as
close to the steel link as practical without use of any special attachments.
3.3.4 Friction ads. Friction pads shall be used at each comer of type I and II
slings to protect the frame webbing from abrasion by the hoist links. The pads shall be
of the same type webbing used in the sling and shall be attached as shown on figures 3, 4,
and 5. For type III slings, see note 4 on figures 6 and 7.
3.3.5 Size of slings. Each size of sling, (see 1.2) , shall be measured from center
of the frame webbing. Dimensions may vary slightly due to minor tolerances of webbing slot
spacings.
The workmanship of the completed slings shall be consistent with the
3.4 Workmanship
rigging practice. The sling shall be free from any defects which may affect the servicea-
bility . All cut-ends of webbing shall be heat-sealed.
QUALITY ASSURANCE PROVISIONS
4.
4.1 Responsibility for inspection. Unless othewise specified in the contract, the
contractor is responsible for the performance of all inspection requirements as specified
herein. Except as otherwise specified in the contract, the contractor may use his own or
any other facilities suitable for the performance of the inspection requirements specified
herein, unless disapproved by the Government. The Government reserves the right to perform
any of the inspections set forth in the specification where such inspections are deemed
necessary to assure supplies and services conform to prescribed requirements.
The inspection requirements specified herein are
4.2 Classification of inspection.
classified as follows:
(a) First article inspection (see 4.3).
(b) Quality conformance inspection (see 4.4).
4.3 First article inspection. First article inspection shall consist of the exami-
nation of 4.5 and tests specified in 4.6.
4.4 Quality conformance inspection.
4.4.1 Sampling for quality conformance inspection.
4.4.1.1 Lot. Slings of the same type, class, and size presented for delivery at one
time shall be considered a lot.
4.4.1.2 Samling for examination of slings. A random sample of slings shall be selec-
ted from each lot n accordance with MIL-STD-105 at inspection level II. The acceptable
quality level shall be 1.0 percent defective for major defects and 4.0 percent defective
for minor defects.
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