MIL-DTL-11352K(AT)
APPENDIX A
the front surface of the vision block being tested will be equivalent to that present when installed
in the vehicle for which intended.
A.3.2.2 Acceptance lot. Eight vision blocks shall be submitted to represent each
acceptance lot. A lot will be judged acceptable on ballistic test when five vision blocks receive a
fair impact at the required striking velocity which results in a partial penetration. A complete
penetration of any fair impact shall be cause for rejection of the lot.
A.3.2.3 Impact. Before ballistic test all blocks to be impacted shall be conditioned to a
temperature of 21±5.5 °C (70±10 °F).
A.3.2.4 Location for impact. The desired location for each impact is within one third of
the distance up from the bottom edge to the top edge of the vision block face.
A.3.2.5 Penetration. To determine whether a complete penetration has occurred
(0.051 mm (0.002 in.) aluminum foil is placed 102 mm (4 in.) behind and parallel to the rear face
of each block during test. A complete penetration, as determined by this witness material is
defined in A.2.2.
A.3.2.6 Striking velocities. The required striking velocities in meters per second (m/s)
and feet per second (ft/s) for each duty of ballistic test defined in A.3.1 are given below. These
velocity requirements apply unless a special requirement has been established in an applicable
contract or drawing by the cognizant Government agency.
Duty A
-
710+12 m/s (2330+40 ft/s)
Duty A1
-
845+12 m/s (2775+40 ft/s)
Duty A2
-
884+12 m/s (2900+40 ft/s)
Duty B
-
895+12 m/s (2935+40 ft/s)
Duty B1
-
924+12 m/s (3030+40 ft/s)
Duty C
-
957+12 m/s (3140+40 ft/s)
Duty C1
-
1000+12 m/s (3281+40 ft/s)
Duty C2
-
1055+12 m/s (3460+40 ft/s)
Duty C3
-
1103+12 m/s (3617+40 ft/s)
The striking velocities listed above apply to the projectiles specified for each respective duty of
ballistic test in A.3.1.
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