Narrative:

Flight attendant from the inbound crew stated that the gust lock on the 'L1 door' was malfunctioning and needed to have maintenance called. I wrote up the door gust lock and call[ed] maintenance. As the a flight attendant and I stood in the galley; the contract maintenance person showed up to the aircraft and proceeded to close and arm the main cabin door while a gate agent was standing on the jetway. The maintenance person reached for the handle to open the door while it was still armed. The flight attendant and I immediately raise[d] our voices telling the maintenance personnel to stop!stop!stop! I physically moved in front of the maintenance person to stop the motion of his arm from opening the door while armed. I was able to disarm the door; verify it was disarmed from the flight deck display; and opened the door normally.by preventing the maintenance person from blowing the slide inside the jetway; we not only saved the company operational impact/delay and the financial impact on the blown slide; but the flight attendant and I saved the gate agent standing directly outside the door from bodily harm or possible death.when maintenance is called to an aircraft to fix an issue; there is an expectation from the crew that the person working on the aircraft is familiar with the type aircraft (airbus; boeing; bombardier...) being worked on.

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Original NASA ASRS Text

Title: A319 Captain and Flight Attendant prevented a contract Maintenance Technician from opening armed cabin door and blowing slide into occupied jetway.

Narrative: Flight attendant from the inbound crew stated that the gust lock on the 'L1 Door' was malfunctioning and needed to have maintenance called. I wrote up the door gust lock and call[ed] maintenance. As the A flight attendant and I stood in the galley; The contract maintenance person showed up to the aircraft and proceeded to close and ARM the main cabin door while a gate agent was standing on the jetway. The maintenance person reached for the handle to open the door while it was still armed. The flight attendant and I immediately raise[d] our voices telling the maintenance personnel to STOP!STOP!STOP! I physically moved in front of the maintenance person to stop the motion of his arm from opening the door while armed. I was able to disarm the door; verify it was disarmed from the flight deck display; and opened the door normally.By preventing the maintenance person from blowing the slide inside the jetway; we not only saved the company operational impact/delay and the financial impact on the blown slide; but the flight attendant and I saved the Gate agent standing directly outside the door from bodily harm or possible death.When maintenance is called to an aircraft to fix an issue; there is an expectation from the crew that the person working on the aircraft is familiar with the type aircraft (Airbus; Boeing; Bombardier...) being worked on.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.