MIL-DTL-11352K(AT)
APPENDIX A
BALLISTIC TESTING OF VISION BLOCKS
A.1 SCOPE
A.1.1 Scope. This appendix covers the requirements for ballistic testing of vision
blocks. This appendix is a mandatory part of this specification. The information contained
herein is intended for compliance.
A.2 DEFINITIONS
A.2.1 Fair impact. An impact located fully on the front transparent surface of a vision
block within desired location. No contact with metal surrounding the front transparent surface of
the block is allowed.
A.2.2 Protection complete penetration CP(P). A penetration in which the projectile, or
one or more fragments of the projectile or the vision block, pass beyond the rear surface of the
vision block and perforate a 0.051 mm (0.002 in.) aluminum foil sheet placed 102 mm (4 in.)
behind and parallel to the rear surface of the vision block.
A.2.3 Partial penetration PP(P). Any fair impact that is not a complete penetration shall
be considered a partial penetration.
A.3 REQUIREMENTS
A.3.1 Ballistic test duties. Ballistic tests are divided into three duties as follows:
Duty A
-
Caliber .30 AP M2
Duty A1
-
Caliber .30 AP M2
Duty A2
-
Caliber .30 AP M2
Duty B
-
Caliber .50 AP M2
Duty B1
-
Caliber .50 AP M2
Duty C
-
14.5-MM AP-I BS-41
Duty C1
-
14.5-MM AP-I BS-41
Duty C2
-
20-MM HVAP-T M602
Duty C3
-
20-MM HVAP-T M602
The duty of ballistic test required shall be specified by the procuring activity.
A.3.2 Ballistic test procedures.
A.3.2.1 Mounting. Vision blocks will be securely mounted for ballistic test in a cupola
or other simulating fixture of the type to be used in the intended service application. Obliquity of
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