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|  MIL-F-48877A (AR)
a.
A new contract is issued
b. A change of fuze type
c.
Fuze timing equipment is modified
For the correlation procedure a digital counter or an
approved equivalent device shall be used, set to read milli-
seconds for S&A timing and set for oscillograph traces, to the
nearest millisecond, for the fuze. The G-weight shall be located
in the downward direction (closest to earth) for both tests. The
correlation shall be accomplished as follows:
a.
Select five (5) S&A's demonstrating acceptable arming
time . Each S&A shall have repeatable arming times
within 25 milliseconds in five successive runs on the
approved S&A timing equipment. S&A arming time readings
shall be obtained from the first movement of the setback
weight to the detent locking in the rotor.
b.
The same S&A's shall be assembled to electronic modules
and placed in fuzes. The fuzes shall then be timed five
(5) times on the approved fuze timing equipment.
Readings of the fuze arming time traces, from setback
weight bottoming to rotor detent, shall be recorded.
The shift in average fuze time, if any, when compared
c.
with the average S&A time (taken as a standard) shall be
used as the correlation correction and applied to the
acceptance test results.
4.5.35 Ballistic firinig test. The loaded M439 fuze shall
be conditioned in accordance with Figure 3 or Figure 4, whichever
is applicable. This test shall be performed at a Government
facility using PXR6358 test warheads. MK66 rocket motors shall
be used for all tests. The fuze shall be set with a Government
approved Ballistic Firing Test Set. A hard copy of the fuze
charge signature shall be made at this time. Prior to setting
arid firing, the fuzes shall be checked for charge circuit
continuity (4.5.20). Fuzes that fail the continuity test shall
not be subjected to the ballistic test. The fuze shall be
removed from the test vehicle and checked for continuity to
determine fuze or test vehicle failure. If it is determined that
there is a test vehicle failure then it is considered a no-test.
Firing and fuze charging shall be accomplished by the ballistic
firing test set using fuze time settings of 2, 8, and 20
Time from launch to fuze function, including the
seconds.
possibility of function upon S&A arming, shall be detected and
recorded.
79
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