How cockpit doors work, emergency codes and the limits of safety measures

European, U.S. and global aviation rules require cockpit doors to withstand impacts from an adult, a force of 113 kg on the handle, and even 9 mm ammunition, ensuring they act as a strong barrier. At the same time, aircraft manufacturers must provide an emergency access system, typically a keypad similar to an ATM, allowing crew to open the door after a short delay if pilots cannot respond. The recent Flydubai episode, where one pilot allegedly attacked another, highlighted the use of this emergency code, while the 2015 Germanwings crash showed the tragic consequences when a locked door could not be opened.

Following that accident, Easa recommended that two pilots stay in the cockpit at all times to monitor each other. ICAO also mandates cockpit-door cameras so crew can see any activity outside the door before granting entry. The article underscores that, despite robust safeguards, no secret override exists for a pilot who barricades himself, raising security concerns.