MIL-DTL-0050869F (AR)
4.5.15 Non-functioning. After completion of the transportation vibration test the fuzes
shall be assembled into cartridges with loaded spitback assemblies but with inert loaded cup and
skirt assemblies in accordance with (Dwg. 9287615). The cartridges shall be fired from a M203
launcher against a vertical soft target, approved by the Contracting Officer. The target shall be
placed forty-four (44) plus or minus two (2) foot from point of fire. The projectile velocity shall
be measured and shall comply with the requirements of 4.5.15.1. Prior to FAT and each LAT,
one test shot shall be fired at the proposed target to check for detonation at a range of 100
meters to proof test target. If one or more fuzes function on the target or a premature burst
occurs the lot shall be rejected and set aside for disposition in accordance with MIL-STD-1916.
The subsequent function or non-function of the fuze down range of the target shall be measured.
4.5.15.1 Projectile Velocity. The projectile velocity shall be measured in accordance
with the functional test procedures of MIL-DTL-50872. The velocity of the projectiles for this
test shall be 226.5 to 267.5 feet/second. If more than 10% of tested rounds have velocities
outside the required range, or if a velocity reading is not obtained, additional firings shall be
made to replace the quantity over the 10% until acceptable velocities have been demonstrated.
4.5.16 X-ray of fuze assembly. Examination shall be performed with X-ray equipment
or any other method acceptable to the contracting officer. Radioscopic examination equipment,
procedures, and personnel shall be in accordance with the requirements of ASTM E1255 Annex
A1. The fuze assembly shall be examined for compliance with 3.2, 3.3, 3.4, or 3.5 as
applicable. The test shall be conducted in two (2) planes:
a. From the top of the fuze assembly down.
b. From the side
4.5.17 Specific gravity of inert material. The specific gravity of the inert material shall
be determined as follows:
Weigh the empty cup and skirt assembly in grams and record as We. Fill the empty
assembly with water at 75 degrees ± 2 degrees F., weigh in grams and record the weight as Ww.
Determine the volume by subtracting We from We. Load the assembly with inert material.
Surface of inert material to meet depth requirement, or liner assembly cavity may be formed or
drilled. Weigh the assembly in grams and record the weight as W1. Fill assembly with water at
75 degrees ±2 degrees F., weigh in grams and record the weight as Wb. Calculate the specific
gravity as follows:
Specific Gravity =
______W1 We______
(Ww - We) - (Wb - W1)
Alternate method for specific gravity determination.
Prior to assembly, weigh empty body assembly with liner assembly and retainer in air
(grams). Record the weight as "A".
Prior to assembly, weigh the same empty body assembly with liner assembly and
retainer submerged in water (grams). Record the weight as "B".
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