Narrative:

During pushback tug driver announced 'breakaway; breakaway' so I applied breaks forcefully to stop aircraft from rolling back any further. This caused aircraft to come to hard stop. Flight attendant was standing in first class galley and was thrown to ground injuring her. After stopping I contacted cabin crew and was told [flight attendant] was injured. No other injuries were reported. We contacted operations and told them we were coming back to gate and would need [medical personnel]. I asked tug driver what happened and was informed the pin popped out of slot. He then towed us back to gate. I informed passengers what was happening. I then verbally briefed [chief pilot] and dispatch. A logbook entry was made. I requested chief pilots office come to gate. [Medical personnel] removed [flight attendant] and a replacement flight attendant was sent to aircraft. Maintenance performed inspection and signed aircraft off. I discussed situation with flight manager and dispatch and we all agreed it was ok to continue.

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Original NASA ASRS Text

Title: B737 flight crew reported an abrupt stop during pushback due to tow pin failure resulted in a flight attendant injury.

Narrative: During pushback tug driver announced 'Breakaway; Breakaway' so I applied breaks forcefully to stop aircraft from rolling back any further. This caused aircraft to come to hard stop. Flight attendant was standing in first class galley and was thrown to ground injuring her. After stopping I contacted cabin crew and was told [Flight Attendant] was injured. No other injuries were reported. We contacted Operations and told them we were coming back to gate and would need [medical personnel]. I asked tug driver what happened and was informed the pin popped out of slot. He then towed us back to gate. I informed passengers what was happening. I then verbally briefed [Chief Pilot] and Dispatch. A logbook entry was made. I requested chief pilots office come to gate. [Medical Personnel] removed [Flight Attendant] and a replacement flight attendant was sent to aircraft. Maintenance performed inspection and signed aircraft off. I discussed situation with Flight Manager and Dispatch and we all agreed it was OK to continue.

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.