An A300 began rolling after pushback because the mechanic did not ask the flight crew to set the par...

Narrative:

Aircraft was being push backed while we were starting engines. Pushback stopped for a brief moment then proceeded to tug us forward a little distance. We were starting number one after number two had been started and stable per the aom. I was looking at the overhead electrical panel for a moment and I heard the mechanic state '....still hooked up'. Then he said 'you are rolling'. The captain applied the brakes; set the parking brake and stated he never heard the mechanic instruct us to set the brakes. Honestly; I never did hear the mechanic say that either. I asked the captain to see if the mechanic was ok. He asked the mechanic was he ok. Mechanic stated 'I am glad I was not in front of the nose wheel.' neither I nor the captain noticed we were rolling forward as we did not expect to be rolling forward and our heads were still in the cockpit regarding engine start procedures. Miscommunication was likely the culprit? I suspect the push- stop- then forward tugging may have been a factor of distraction as we both discussed in the cockpit 'what are they doing?' mechanic was ok and clear. He checked off the headset and we taxied out for normal flight. In the future; I will pay more attention to the brake set issue before I go to scanning overhead indications to confirm normal situation.

Original NASA ASRS Text

Title: An A300 began rolling after pushback because the Mechanic did not ask the flight crew to set the parking brake before disconnecting the tug and towbar.

Narrative: Aircraft was being push backed while we were starting engines. Pushback stopped for a brief moment then proceeded to tug us forward a little distance. We were starting number one after number two had been started and stable per the AOM. I was looking at the overhead electrical panel for a moment and I heard the Mechanic state '....still hooked up'. Then he said 'You are rolling'. The Captain applied the brakes; set the parking brake and stated he never heard the Mechanic instruct us to set the brakes. Honestly; I never did hear the Mechanic say that either. I asked the Captain to see if the Mechanic was OK. He asked the Mechanic was he OK. Mechanic stated 'I am glad I was not in front of the nose wheel.' Neither I nor the Captain noticed we were rolling forward as we did not expect to be rolling forward and our heads were still in the cockpit regarding engine start procedures. Miscommunication was likely the culprit? I suspect the push- stop- then forward tugging may have been a factor of distraction as we both discussed in the cockpit 'What are they doing?' Mechanic was OK and clear. He checked off the headset and we taxied out for normal flight. In the future; I will pay more attention to the brake set issue before I go to scanning overhead indications to confirm normal situation.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1015855
Time
Date	201206
Local Time Of Day	1801-2400
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Make Model Name	A300
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Experience	Flight Crew Last 90 Days 120 Flight Crew Total 9000 Flight Crew Type 1000
Events
Anomaly	Deviation - Procedural Published Material / Policy Ground Event / Encounter Loss Of Aircraft Control Ground Event / Encounter Person / Animal / Bird

An A300 began rolling after pushback because the mechanic did not ask the flight crew to set the parking brake before disconnecting the tug and towbar.