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MIL-F-63446B (AR)
hours minimum. In the preparation for the test, each fuze shall be secured to holding fixtures that
simulate the fuze seat of a grenade body. Design of the fixtures shall be such as to allow for
assembly of a felt take-up pad beneath the barrier plate of the fuze compressed to the proper
degree. Clamping arrangements shall suffice as a method to join the fuze to the holding fixture
provided the fuze is properly seated and remains so for the duration of the test. It shall be
established that the clamping apparatus does not alter the resonant frequencies of the fuze
assembly. Prior to the test the safety pin shall be removed from the fuzes. After the test, prior to
removing the fuzes from the holding fixtures, it shall be established visually that the fuzes are safe.
To be considered safe the fuze must meet each of the following requirements:
a. The shear wire must not be cut.
b. The slider must be in the full safe position.
c. The firing pin must not have triggered.
If any fuze fails to meet any requirement listed above, it shall be considered a safety failure. A
single safety failure shall reject the lot.
Having established the fuzes to be safe, operability shall be verified. Half of the samples tested at
hot and half of those tested at cold temperature shall be subjected to the Fuze No-Go test. Any
fuze that fails the Fuzing No-Go test shall be considered an operability failure. A single such
failure shall reject the lot. Fuzes that pass the Fuzing No-Go test shall be disposed of per 4.5.15.
The remaining fuzes tested at hot and the remaining fuzes tested at cold shall be subjected to the
Fuzing Go test. Fuzes that fail to function shall be considered operability failures. See 4.5.16 for
the quantity of Fuzing Go failures that will reject the lot.
4.5.9 Helicopter vibration. A sample of fuzes shall be randomly selected from each
production lot and subjected to&e sinusoidal cycling described by Curve M in Method 514 of
MIL-STD-810B. All fuzes shall be tested at ambient temperature. Prior to the test, the fuzes
shall be secured to holding fixtures that simulate the fuze seat of a grenade body assembly.
Design of the fixtures shall be such as to allow for assembly of a felt take-up pad compressed to
the proper degree. The methods utilized to attach the fuze to the holding fixture shall not alter
the resonant frequencies of the fuze. The safety pin shall be removed from the fuze just before the
test is begun. Operability verification and acceptance criteria shall be identical to those
requirements specified in 4.5.8 (Transportation Vibration).
4.5.10 Five foot drop. A random sample of fuzes shall be selected for the drop test as
specified in MIL-STD-331. The drops shall be made in the following orientations:
a. Base down
b. 45 Base down
c. Horizontal
d. 45 Nose down
e. Nose down
One fifth of the fuzes shall be dropped in each orientation and thereafter it shall be established
visually that the fuze continues to be safe to handle and dispose of. For the fuze to be considered
safe, the following conditions must be met:
a. The safety pin must be engaged and shown to have locked the slider in the full safe
position. If the safety pin remains locked in its original position (i.e., the locking loop of the pin
engaged with the safety pin post protruding from the fuze body) and it has been established that
the detonator is out of line with the firing pin, then the fuze shall be considered safe to handle and
dispose of even if the following is evident:
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