MIL-S-58112
a. Determine the cause of the failure.
b. Take the necessary action, with the concurrence of the procuring
activity, to correct or eliminate the failure from all units in the
inspection lot and, if so directed by the procuring activity, from those
units previously shipped.
c. Submit to the procuring activity for approval, the proposed
corrective action to prevent recurrence of the failure.
d.
Retest in accordance with 4.6.4.
4.5
First article test. All loads shall be applied in the manner
prescribed on the applicable component drawing.
4.5.1. Proof load test. Each component of
the first article samples
shall be pulled to the proof loads indicated in
Table 1. The load shall
be relaxed and the part under test examined for
defects prior to
application of ultimate loads. Evidence of
permanent set, tears,
distortion or separation is cause for rejection
of the first article.
4.5.2 Ultimate load test. This test shall be performed
on the same
first article samples which have previously been subjected
to proof load
testing as required by paragraph 4.5.1. Each component
of the first test
article samples shall be pull tested to the ultimate loads
indicated in
table I.
4.5.3 Cyclic load test. This test shall be performed on a rope assembly
which was previously subjected to the proof load test as required in
paragraph 4.5.1. One of each size rope assembly shall be subjected to the
cyclic loads indicated in Table II for an accumulative time of not less
than one (1) hour. The required time at specified loads and frequencies
may be accumulated by translationing to reduced load and frequency levels
to prevent overheating of the rope. External cooling using air at a
minimum temperature of 20 degrees C (68 degrees F) is allowed only during
these reduced load, cool-down periods. No more than 15 cool-down periods
shall be allowed in accumulating the one (1) hour of cyclic load testing
under the specified conditions. The cyclic load shall approximate a sine
wave (load versus time). The maximum and minimum loads shall be within
+300 Kgs (660 pounds) of the values specified in Table II. Momentary
non-compliance with these values in excess of ten seconds over a five
minute period shall invalidate that increment of the load test since the
last transition. At conclusion of cyclic testing, the rope assembly shall
be subjected to the proof loads as specified in Table I. Any evidence of
disengagement of splicing, separation of the potting from the strength
member or the thimble while under the post-cyclic load shall be grounds
for rejection.
4.5.4 Dust test. Dust test shall be performed as specified in
MIL-STD-810, Method 510.1/1. This test shall be performed on a rope
assembly which was previously subjected to the proof load test. After the
dust test, the rope assembly shall satisfactorily complete the ultimate
load test of paragraph 4.5.2.
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