Germanwings Crash: How the Lock on the Cockpit Door Works

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Germanwings Crash: How the Lock on the Cockpit Door Works

Evidence from the cockpit voice recorder recovered from the wreckage of Germanwings Flight 9525 indicates that the co-pilot locked the captain out of the cockpit. Here are three different ways to unlock and lock the cockpit door, based on a video by Airbus, the manufacturer of the plane.

Normal procedure for entering the cockpit

1A crew member calls the cockpit on an intercom.

2After making contact, the crew member presses the pound key on the keypad, which sets off a buzzer inside the cockpit.

3The pilot switches the door-control toggle from “NORM” to “UNLOCK.”

4A green light on the keypad indicates that the door is unlocked.

5The crew member can enter the cockpit.

If a crew member believes the pilot is incapacitated

1If a member of the flight crew follows the normal procedure for entering the cockpit and gets no response, he or she would enter an emergency code into the keypad, triggering a 30-second timer. All crew members know the emergency code.

2 After 30 seconds, if there is no response from the cockpit, the door unlocks for five seconds.

3 The emergency code will not work if the pilot’s toggle is set to “LOCK.”

If the pilot wants to keep others out of the cockpit

1 The pilot, or someone else in the cockpit, can prevent anyone from entering by moving the door toggle to the “LOCK” position.

2 The “LOCK” position disables emergency access for five minutes at a time.

 http://www.nytimes.com/interactive/2015/03/26/world/europe/germanwings-cockpit-door-lock.html?action=click&contentCollection=Europe&module=RelatedCoverage&region=Marginalia&pgtype=article

 Wniosek: W każdym razie – po pięciu minutach Pierwszy Pilot mógł wejść.