Narrative:

Upon arrival at gate single engine; ran out momentum just prior to parking spot and had to add a little power. Marshaller gave stop signal shortly thereafter and stopped normally using toe brakes. For some reason I failed to set parking brake; and the aircraft begin rolling backwards. I stopped the airplane; set the parking brake; and the aircraft was later towed forward into position.I don't not have an answer for why I failed to set the brake. I believe it was a combination of being tired from four days of flying; a very early wake up; thinking about using a new parking checklist for the first time; but overall; just a lack of concentration and focus. No excuse. All were red flags that should have been heeded and resulted in greater focus and concentration. The flight is not over until the parking checklist is complete and our passengers are off the airplane. We all must remember that. I certainly will.it is very easy to become complacent in this business of repetitive flights to the same stations; multiple legs each day; etc. We absolutely cannot let this happen as it will bite us when we least expect it; such as this; the last event of the last leg of the last day of a four day trip. 'It ain't over until it's over' good advice from a wise former baseball player. I certainly won't forget it.

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Original NASA ASRS Text

Title: A319 Captain and Ramp Marshaller reported the aircraft began to roll back after parking short of gate. Captain inadvertently failed to set parking brake when commanded by ramp personnel. Captain then set parking brake.

Narrative: Upon arrival at gate single engine; ran out momentum just prior to parking spot and had to add a little power. Marshaller gave stop signal shortly thereafter and stopped normally using toe brakes. For some reason I failed to set parking brake; and the aircraft begin rolling backwards. I stopped the airplane; set the parking brake; and the aircraft was later towed forward into position.I don't not have an answer for why I failed to set the brake. I believe it was a combination of being tired from four days of flying; a very early wake up; thinking about using a new parking checklist for the first time; but overall; just a lack of concentration and focus. No excuse. All were red flags that should have been heeded and resulted in greater focus and concentration. The flight is not over until the parking checklist is complete and our passengers are off the airplane. We all must remember that. I certainly will.It is very easy to become complacent in this business of repetitive flights to the same stations; multiple legs each day; etc. We absolutely cannot let this happen as it will bite us when we least expect it; such as this; the last event of the last leg of the last day of a four day trip. 'It ain't over until it's over' Good advice from a wise former baseball player. I certainly won't forget it.

Data retrieved from NASA's ASRS site 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.