Have been a pax on a flight in the USA that had an overwing exit slide deployed by a maintenance person. Aircraft (B757) had come across from maintenance as a replacement for a DC10 that had gone tech. Sat on the left side a few rows back from wing as passengers boarding - aware of pax having a problem in o/wing exit row - turns out that the seat belt had been trapped in the exit door - techie tried to free by pulling, no luck so just pulls the emergency handle with the result that the slide deploys - opps.
Captain comes over PA sounding less than happy and we all get off while slide is repacked (4-5 hours he said).
Are the o/wing exits disarmed at the same time as the main doors? or is there some other method by which they are disarmed.