Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Situational Awareness; Communication Breakdown
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Object
Flight Crew Returned To Gate
Human Factors
We pushed back from [our] gate. The left engine start was complete and during the start of the right engine; I heard line service say 'stop stop'. My head was down during that time verifying the load closeout and inserting the takeoff performance numbers in the MCDU. But when I heard line service say 'stop stop' I looked up and saw the aircraft was moving forward. The tow bar was still connected at that time. There was slight damage to the tow bar and the aircraft nose tire. We got towed back to the gate. Maintenance changed the nose tires and we proceeded with no further incident. I believe there may have been a miscommunication on whether the brakes was set or not during that time.Eliminating heads down during movement on a busy ramp will bring more situational awareness of surrounding elements.
Aircraft rolled and damaged tow bar wheel. Slight damage to left nose wheelLine service advised over the headset to stop. Initially thought he meant stop the engine start; but when I asked; 'stop the start?' he responded by saying; 'no stop moving'.Parking brake not set and tug disconnected without crew knowledge. I never heard 'set brakes' Consequently I did not do the normal 'flow' of checking if the brake was set and did not verbally respond.
B717 flight crew started engine during pushback and damaged nose gear due to aircraft rolling forward.