Mechanical latches protecting the compartment behind a hatch are a soft entry point for terrorist threats. On the aircraft, these compartments range from external hatches, internal overhead bins, cupboards, lavatories and galleys. On the airport apron, they include freight containers, food trolleys and luggage and waste disposal carts. Today many manhours are spent checking these areas in preflight inspection. TZ networked devices offer a solution to manual pre-flight checks by creating a micro electronic security system that controls and monitors these spaces.