B787 captain reported a breakaway during pushback that resulted in aircraft damage.

Attributes
ACN	1696172
Time
Date	201910
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	B787 Dreamliner Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 140 Flight Crew Total 14966 Flight Crew Type 93
Events
Anomaly	Aircraft Equipment Problem Less Severe Ground Event / Encounter Other / Unknown

Narrative:

After pushback; tow crew asked me to release brakes as they were unable to disconnect towbar. With brakes released after a minute or so felt bump. Recognized breakaway and set brakes. Just after that; tow crew came on and said 'set brakes; set brakes.' told him already set. Called for maintenance to come out. Disembarked passengers with people mover. Got new plane.

Original NASA ASRS Text

Title: B787 Captain reported a breakaway during pushback that resulted in aircraft damage.

Narrative: After pushback; tow crew asked me to release brakes as they were unable to disconnect towbar. With brakes released after a minute or so felt bump. Recognized breakaway and set brakes. Just after that; tow crew came on and said 'set brakes; set brakes.' Told him already set. Called for Maintenance to come out. Disembarked passengers with people mover. Got new plane.

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.