article_snippet: The system could also switch The system on if terrorists tried to fight terrorists way into the cockpit, with pressure sensors on the door responding to excessive force.
article_snippet: Airbus A320 (like the one above) can be disabled from inside the flight deck to prevent hijacking .
article_snippet: To save weight, the reinforced cockpit doors often contain bullet-proof Kevlar and other super-strong composite compounds, as well as metal.
article_snippet: The Airbus A320 has a keypad outside the cockpit which allows cabin crew to gain access by tapping in a secret code if the pilots become incapacitated for some reason.
article_snippet: But his crazed co-pilot can flick a switch to lock the door from the inside, which deactivates the external keypad for between five and 20 minutes.