Narrative:

On arrival at night into ZZZ; aircraft was being marshaled into gate XXX. Ground crew gave the stop signal for completion of parking; and I distinctly remember watching the captain set the parking brake which is always what I use as my indication to turn off the fasten seat belt sign and continue with my flow. After completing my flow; I slid my seat back and took off my headset; to which I heard someone scream; 'woah woah woah!' from outside the aircraft. At this moment I realized the aircraft had begun rolling forward [and] the engines had not been shut off yet. I immediately got on the brakes; which caused an abrupt stop. The captain also got on the brakes and we both saw; at the same time; the parking brake handle was down and stowed. I distinctly remember watching the captain pull up and turn the parking brake handle and I never heard the click of the parking brake being released. The aircraft rolled about 10 feet. Before being stopped. No injuries occurred on the ground or in the cabin from the abrupt stop. Engines were shut off and passengers deplaned with no further incidents. The captain and I discussed it and we both agree that the parking brake was definitely set after stopping and did not hear it being released at any point afterwards. A suggestion for myself would be to not become so complacent on making sure the parking brake is set from just the captain setting the handle. I can also look outside to verify that the aircraft has stopped moving and that everything is secured; as well as the handle being up with the parking brake light turned on.

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Original NASA ASRS Text

Title: EMB-145 flight crew reported an inadvertent release of the parking brake at the gate.

Narrative: On arrival at night into ZZZ; aircraft was being marshaled into Gate XXX. Ground crew gave the stop signal for completion of parking; and I distinctly remember watching the Captain set the parking brake which is always what I use as my indication to turn off the fasten seat belt sign and continue with my flow. After completing my flow; I slid my seat back and took off my headset; to which I heard someone scream; 'Woah woah woah!' from outside the aircraft. At this moment I realized the aircraft had begun rolling forward [and] the engines had not been shut off yet. I immediately got on the brakes; which caused an abrupt stop. The Captain also got on the brakes and we both saw; at the same time; the parking brake handle was down and stowed. I distinctly remember watching the Captain pull up and turn the parking brake handle and I never heard the click of the parking brake being released. The aircraft rolled about 10 feet. before being stopped. No injuries occurred on the ground or in the cabin from the abrupt stop. Engines were shut off and passengers deplaned with no further incidents. The Captain and I discussed it and we both agree that the parking brake was definitely set after stopping and did not hear it being released at any point afterwards. A suggestion for myself would be to not become so complacent on making sure the parking brake is set from just the Captain setting the handle. I can also look outside to verify that the aircraft has stopped moving and that everything is secured; as well as the handle being up with the parking brake light turned 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.