There is a combo lock, but whoever was inside the cockpit set the 3 position lock to override the ability of anyone outside to get in.
A320 Cockpit Door Panel
Cockpit Door Panel | Cockpit Door Switch
Cockpit Door Switch
UNLOCK
Unlocks door when raised above the detent and held in this position. Door must be pushed to open. UNLOCK is an override and reset selection of any previous action.
NORM
When NORM is selected, it allows the door to be locked when closed. It also allows the door to be opened after an emergency access code entry and 30 second delay in case of pilot incapacitation.
LOCK
Momentarily placing the cockpit door switch to LOCK illuminates the red cockpit access panel light, rejects keypad entry request, inhibits aural alerts, and prevents further access code entry for 20 minutes. The cockpit door switch returns to NORM when released, but remains in locked mode for 20 minutes or until UNLOCK is selected.
There is no cockpit indication when LOCK is selected; therefore, if the door is closed and the cockpit is unattended during a locked period, the door cannot be opened until the timer expires or power is removed from the airplane.
pprune.org
261 posted on 03/25/2015 6:51:16 PM PDT by Praxeologue ( ‘)
http://www.freerepublic.com/focus/f-news/3272136/posts?q=1&;page=251