Captain Sondenheimer of Germanwings Flight 9525 performed multiple attempts to unlock the cockpit door; he tried his code but was it disabled from the cockpit controls; requested re-entry using the intercom where he he knocked and then banged on the door but received no response; finally, tried to physically break down the door but as it was reinforced to prevent intrusion.
Captain Sondenheimer of Germanwings Flight 9525 performed multiple attempts to unlock the cockpit door; he tried his code but was it disabled from the cockpit controls; requested re-entry using the intercom where he he knocked and then banged on the door but received no response; finally, tried to physically break down the door but as it was reinforced to prevent intrusion.