Special Features:

A part, assembly, or system identified as essential to weapon system performance or operation to preserve life and safety of personnel

Properties:

A box, frame, or plate fabricated of electrically conductive material designed to mount, but which does not include, electronic components and their associated circuitry. it may have facilities for attachment to a rack or cabinet or to accommodate specially designed components. it may include a shielding function, integral wiring, and mounting hardware as part of the item. excludes mounting base, electrical equipment.