B777 flight crew and maintenance personnel reported the aircraft rolled back while maintenance was troubleshooting a brake system issue. The 2L door contacted the gate causing it to shear off and the aircraft then stopped.
Synopsis
B777 flight crew and maintenance personnel reported the aircraft rolled back while maintenance was troubleshooting a brake system issue. The 2L door contacted the gate causing it to shear off and the aircraft then stopped.
Narrative
After disconnecting from the tug and releasing the brakes post engine start; the Anti-Skid" EICAS message appeared as we began to roll forward. Upon coordinating with ZZZ Ramp; we parked to trouble shoot and contact Maintenance; who in turn had us contact Maintenance Control via dispatch. We were directed to return to the gate. After we coordinated with ramp and GND; we returned to Gate. After the DGS was activated and the ramp was cleared; we began to park. With Parking Break Set; FO contacted ramp to ask about a gate agent and ground personnel for the jet. The "Shutdown" checklist was completed. A gate agent positioned the gate and allowed maintenance to board. Both the FO and FB vacated the flight deck to allow for maintenance personnel to investigate the Anti-Skid system. The CA remained until an additional maintainer needed his seat. All three pilots were out of the flight deck and in the First Class Galley. The CA gave a PA to advise the passengers. It was at this point that one of the flight attendants came running up saying the jet was moving. Immediately after that is when the aircraft door 2L made contact with the gate and sheared off the aircraft. The aircraft came to a stop with no injuries. Cause: Unknown since all pilots were off the flight deck when event occurred.Suggestions: None since all pilots were not present for event."
Second reporter narrative
[Report narrative contained no additional information.]
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.