At my Airline there is a cross-checking procedure in place to check the doors are armed/disarmed...this is then past on to the Supervisor. This is almost faultless in preventing incidents occuring.
When it comes to opening doors, All crew including number 2's have to ask the permission of the Supervisor. The SOP is to bring the yellow strap across to allow crew & passengers to now that the door is open. Off course doors are not ment to be opened without steps/airbrigde but this is not always possible with caterers & ambi-lifts coming & going...
From what i know there has been little incidents at my airline, the odd slide blowing here & there...
