U.S. Congressman Mike Fitzpatrick has proposed new legislation [H.R. 1775] to require secondary cockpit safety barriers on Part 121 airliners. The metal barrier would be lowered between the first row of seats and the existing hardened cockpit door whenever a pilot leaves the flight deck.
The extra-barrier idea evolved from a study conducted by the Radio Technical Commission for Aeronautics (RTCA) at the request of the FAA, the Air Line Pilots Association and other industry stakeholders to provide more specific guidance on securing the flight deck.