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|  MIL-F-48877A (AR)
4.5.30 M439 fuze arming time test. The fuze in the
horizontal plane with the G-weight located in the downward
direction (closest to earth), shall be assembled to the test
equipment in accordance with 4.4.3. The equipment shall
accelerate the loaded fuze in a clockwise direction to 55.0 0.5
g's and the arming time shall be recorded to the nearest
hundredth of a second using a swing fixture and acoustic pick-up
feeding the arming cycle noise signal to a design agency approved
recorder.
The arming time as recorded using the swing fixture
shall be adjusted using the correlation factor as determined in
Any fuze that fails the requirements of the arming time
4.5.3.4.
test shall be classed defective.
4.5.31 Mechanical interrupt test. The armed fuzes from
4.5.30 shall be checked for charge circuit continuity using
Government approved equipment and procedures. Any fuze that does
not indicate an open circuit between the charge circuit and the
umbilical shall be classed defective.
4.5.32 Test equipment failure. If the test equipment fails
to produce an arming readout (i.e., recording paper skewes, audio
pick-up, or amplifier inoperative) during the arming time test as
verified by the Government, the Safety and Arming Device shall be
visually inspected for arming; if found to be armed or partially
armed, score as a "no test" and replace with a spare fuze. The
timing record produced by the fuze on the approved fuze timing
equipment shall be considered the timing record of the fuze under
the applicable defect classification.
If the electronic module time delay test equipment is
suspected to have malfunctioned during the module time delay
testing specified of 3.14. The assembly may be tested four (4)
more times and if all time delays meet the acceptance limits, the
first reading may be considered as a no test and the second
reading shall be used
Procuring contract officer's approval
must be obtained prior to the retest.
4.5.33
Rounding off of fuze function times, fuze arming
times and module function times. Fuze function times, fuze
arming times, and module function times if recorded to more than
two (2) places to the right of the decimal point shall be
"rounded" off to the hundredth of a second.
4.5.3 4 Correlation factor. A cor relati
factor, which
corr elates the fuze arming time me t hod (swin
ixture) to the in-
time method, sha ll be run fo r t his fuze.
lin e S&A a
Correlation tests shall be performed by the con tractor with
Government verification. Correlation factor
hall be validated
at six month intervals (maximum) and re-esta
shed whenever:
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