Did he lock the door as a matter of training? Is it possible he had a medical issue?
My understanding is that it would take a deliberate sequence of actions to take the plane off autopilot.
HOW ACCESS TO THE COCKPIT DOOR CAN BE DISABLED FROM THE INSIDE
Access to the cockpit door on the Germanwings Airbus A320 (like the one above) can be disabled from inside the flight deck, raising speculation that one of the pilots deliberately locked the other out
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Access to the cockpit door on the Germanwings Airbus A320 (like the one above) can be disabled from inside the flight deck, raising speculation that one of the pilots deliberately locked the other out
The Airbus A320 is fitted with a locking mechanism to prevent unauthorised access to the flight deck while the aircraft is in flight.
The safety systems were improved in the aftermath of the 9/11 terror attacks where hijackers were able to gain access to the cockpit and take over the aircraft.
In normal flight, the door to the flight is closed and locked.
Cabin crew can use a code and gain access to the flight deck. Entry is controlled by the flight crew, in case of a possible hijack attempt.
The Cockpit Door Locking System (CDLS) according to the flight manual ‘provides a means of electrically locking and unlocking the cockpit door’.
The CDLS is located in the central pedestal between both pilots and has a toggle switch which controls the door.
They also have a CCTV camera so they can see who is seeking access, and if they are under any form of duress.
Pilots can restrict access to the flight deck although cabin crew can gain entry in an emergency. However, this emergency access can be over-ridden by the pilot for between five to 20 minutes.
The limited time to keep the door closed is itself a safety feature, in case the flight crew become incapacitated - known in the industry as ‘incap’.
After the predeterminted time, the keypad on the outside of the cockpit door will become operational again, unless the pilot actively restricts access again.
Also the cockpit door has several other safety features in case of a sudden decompression which will cause the door to open.
According to the flight manual there are ‘routine’ and ‘emergency’ access requests.
‘The toggle switch enables the flight crew to lock or unlock the cockpit door, following an access request, thereby allowing or denying the entry to the cockpit.’