B767-300 and 300 ER
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Communication Breakdown
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Loss Of Aircraft Control
Flight Crew Took Evasive Action
Procedure; Aircraft
After push back was complete; the push back crew stopped our aircraft and asked us to set parking brake. I reached down and pulled the parking brake handle up; while also pressing the brake pedal. I reported over the headset to the ground crew that the parking brake was set. Moments later; the ground crew reported the aircraft was rolling forward. At the same time; I noticed the aircraft was rolling as well. The ground crew called us over the headset to advise us; at which point I stopped the aircraft roll and reset the parking brake. The aircraft rolled about 10 feet. I asked if everyone was okay and if there was any damage. The report back from the ground crew was that everyone was safe and there was no damage. We continued with our flight at the point. Big takeaway here is that we need to always look to verify that the parking brake light is indeed on; thus verifying the parking brake is in fact set. I cannot honestly say if I checked for the light or not.
We were pushed back in ZZZ; and cleared to start engines. I was starting number 2 when we were told to set brakes. I thought I saw the Captain set the parking brake; and then I looked back at the egt to finish the start. A few seconds later; I heard the ground crew calmly say; 'sir; you're rolling.' The Captain jumped on the brakes and reset the parking brake. He then asked the ground crew if everyone was ok. The ground crew said everything was fine. The rest of the flight was uneventful.
B767 flight crew reported aircraft began rolling after tow bar was disconnected after push back.