The cockpit safety lock system has caused a plane crash in France

The cockpit safety lock system after the 9/11 terrorist incident accidentally helped Andreas cause this catastrophic plane crash.

Learn the Airbus A320 cockpit cockpit security lock system

New information from the Airbus A320 plane crash in France, said the pilot on this flight had deliberately turned off the engine and caused the plane to fall freely into the Apls mountains, to commit suicide with the passengers ill-fated on the plane.

The copilot Andreas Lubitz took advantage of the time when the captain left the cockpit to lock the door and made it impossible for anyone to enter. This is the security lock system used to fight terrorism, after the September 11 event. And it was this anti-terrorism technology that inadvertently helped Andreas cause this catastrophic plane crash .

The Airbus A320 is equipped with a locking system to prevent unauthorized entry into the cockpit when the aircraft is flying . The door is also reinforced so it cannot be broken from the outside.

In normal flight, this door is set to close and lock, but the crew can still open the door with a code. This is the electrical system and can be controlled from the control panel inside the cockpit.

Access to the cockpit door on Airbus A320 Germanwings (as above) can be disabled from inside the deck to prevent hijacking.

This system is programmed for every possible situation. The captain in the cockpit can restrict access to the unlock code system if there is a threat outside the cockpit.

The locking system on the Airbus A320 has three settings :

Unlock: This mode allows the cockpit door to not be locked, however the captain inside will have to drag and hold this position until the door opens. It is like a pull pin that if released will return to the locked position.

Normal: All latches are locked, but the crew outside can still unlock with a password.

Lock: With this setting, all latches are locked and the crew cannot use the password to unlock it, only the pilot inside the cockpit can open the door from the inside . However, in order to avoid terrorism gaining control of the cockpit, this mode will only disable the crew password for about 20 minutes after entering the password. After 20 minutes, the crew outside could still open the door and enter the cockpit. This period of time is enough for the pilot and the captain to contact the ground or provide a solution if there is an external threat.

It was this setting that made the captain unable to return to the cockpit within 20 minutes, and during that time Andreas copilot turned off the airplane's engine and made it crash into the Apls mountains.