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|  MIL-L-22624A
4.6.1.7 Unlinking test. Link samples used in the test
of 4.6. 1.6 shall be tested using the equipment shown in
Figure 2. The test shall be performed in two stages, as
follows:
The test fixture weight of 2.0 pounds
(a )
shall be allowed to fall freely a dis-
tance of 3.0 inches and strike the test
stud. Test samples unlinking from each
other are defective. If partial disen-
gagement occurs, the links shall be re-
stored to their original test position
for test (b).
The same weight shall be allowed to fall
(b)
freely a distance of 12.0 inches. Test
samples failing to disengage completely
are defective.
4.6.1.8 Pitch distance test. Eleven Mod 4 links shall
be linked and loaded with dummy rounds (see 3.7) and sus-
pended vertically from an appropriate holding device. The
pitch distance (defined as shown in Figure 1 ) shall be
measured between the rivet of the second link and the rivet
of the last link. The link shall meet the requirements of
3.4.6.
4.6.1.9 Belt strength test. The belted links of 4.6.1.8
shall be reused with the test equipment shown In Figure 5.
The test arbors shall be used to attach the weight assembly
to the center link and to attach the first and last links
to their mounting brackets. Measure the distance from the
bottom of the weight assembly to the reference line. Raise
the 8.0 pound weight 18 inches and release it. Again measure
the distance between the weight assembly and the reference
line. If the change in measurement exceeds 0.288 inch, the
increase in link pitch does not meet the requirements of
3.4.7.
4.6.1.10 Twist test. Thirteen Mod 4 links shall be belted
and tested for conformance to 3.4.8.1.
4.6.1.11 Fanning test, projectile ends out. Sixty Mod 4
links shall be belte d, loaded with dummy rounds, and placed
on a plane surface. The links shall be fanned in a circle
with the flanged ends of the carriers touching. The belt
may be separated to provide the number of belted links nec-
essary to determine conformance to 3.4.8.2.
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