B787-800
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 98; Flight Crew Total 7618; Flight Crew Type 472
Communication Breakdown; Distraction; Other / Unknown; Time Pressure
Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Hazardous Material Violation; Ground Event / Encounter Ground Equipment Issue
Flight Crew Overcame Equipment Problem; General Flight Cancelled / Delayed; General Maintenance Action
Human Factors; Equipment / Tooling
Late pushback due to no final DG report despite repeated requests from flight crew. On pushback and pull forward and stop; we heard nothing from the Ground Crew. The tug pulled away and the Flight Crew noticed we were drifting backwards. We carefully and gently applied the brakes; and set the parking brake. The Captain made repeated attempts to contact the Ground Crew. The Ground Crew then tried to get the Captain to start the engines using hand signals. He declined; called Operations and Maintenance and made a maintenance write-up as per SOP. The aircraft received a new Maintenance Release; the Ground Crew got a new headset; and the rest of the flight was normal.
Toward the end of pushback the ramp crew lost communication with the flight deck.  Then It appeared we experienced a tow bar break away.  We never heard 'breakaway' from the ramp due to a broken ramp side headset.  The flight crew identified the breakaway and gently applied the brakes; and set the parking break.  Soon after; we received hand signals for engine start.  We did not start engines.  We wrote up the event and maintenance cleared the issue.
Air Carrier Captain and First Officer reported multiple requests to obtain required Final DG report. Additional delay caused by Pushback crew communications issue. Flight crew received a new Flight Release and rest of the flight was normal.