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MIL-W-63468A (AR)
Following the vibration test, each round shall be x-rayed or
fluoroscope. A visual examination shall be performed. The first
article shall be rejected if one or more warheads are found to be
not safe as a result of the effects of the secured cargo vibration
test.
If no safety hazard is noted, the warheads shall be ballistically
tested in accordance with 4.5.8.
4.5.4 Helicopter vibration test.  The helicopter vibration
test shall be performed as follows on each of nineteen (19)
warheads for first article testing only.
a.
Sweep Test.  Warheads with inert MK66 motors shall be
loaded into a light weight launcher and subjected to
a low level sweep test.  The loaded launchers will be
tested in each of three orthogonal axes.  The sweep
level will be 1/2G or lower as necessary to limit the
maximum response of the launchers to the Table II
levels.  This test will define the dynamic resonances
of the system as mounted on a vibration shaker.
b.
Dwell Test.  Following the sweep tests, warheads with
inert MK66 motors loaded in a launcher shall be
subjected to vibration excitation in each of the
three orthogonal axes.  The test shall be conducted
at each of four principal frequencies 11, 22, 33 and
44 Hz.  The input levels at each frequency will be
such as to provide the launcher response levels as
specified in Table III for the time durations
-
The test method to be used is the random
indicated.
noise method limited to the frequency range of
interest.
Prior to performing the helicopter vibration test,
c.
x-ray or fluoroscope each round in two planes, 90
opposed, to verify that all components are secure and
no armed grenades are evident.  After performing the
test on all warheads, each round shall be x-rayed or
fluoroscope.  A visual examination shall be
performed.  The first article shall be rejected if
one or more warheads are found to be not safe as a
result of the effects of the helicopter vibration
test.  If no safety hazard is noted, the warheads
shall be ballistically tested in accordance with
4.5.8.
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