Narrative:

After approximately 40 min of holding we were cleared to land. Landed and taxied to the gate. Ramp was closed due to lightning. We self-parked using the self-park system. Brakes were set and parking checklist completed. I went back to cabin to thank folks for flying with us and then I moved to first class cabin for the same. I noticed that the gate alarm was going off due to jet way sagging approximately 10 low. Agent was there to silence horn or correct. A few minutes later I heard some commotion on the jet way and realized that either jet way was moving or aircraft was. Before I could go back to cockpit; the outbound captain that was waiting to come on board noticed the aircraft movement and rushed to cockpit to verify or set brakes. Aircraft stopped within inches of contacting jet way. There was no damage to aircraft and no passengers were hurt. Once maintenance checked aircraft and determined that is was unaffected; we were towed forward and deplaned the rest of passengers. First officer admitted releasing brake handle to help cool hot brakes. He assumed wheels were chocked even though ramp was closed. He was also unaware of aircraft movement as he was downloading flight plan from i-pad for the next flight and had head buried in his lap. Our procedures are a bit flawed as you don't really know if aircraft is chocked even though they give you the chocks in signal. I find myself more than not looking at aircraft as I walk from gate to gate to make sure it is indeed chocked. I also remember that several years ago we used to never release brakes even if they were hot. On other fleets it is a common procedure to release brakes all the time whether brakes are hot or not.

Related reports:

Google
 

Original NASA ASRS Text

Title: After using the self-parking system to park at the gate due to lightning on the airport; First Officer released the brakes after noticing a Hot Brakes ECAM message. Due to the lightning; no ramp personnel were assisting the aircraft and the wheel chocks had not been inserted. The aircraft began rolling backwards and got to within four inches of the jet bridge before the aircraft brakes were reapplied.

Narrative: After approximately 40 min of holding we were cleared to land. Landed and taxied to the gate. Ramp was closed due to lightning. We self-parked using the self-park system. Brakes were set and parking checklist completed. I went back to cabin to thank folks for flying with us and then I moved to first class cabin for the same. I noticed that the gate alarm was going off due to jet way sagging approximately 10 low. Agent was there to silence horn or correct. A few minutes later I heard some commotion on the jet way and realized that either jet way was moving or aircraft was. Before I could go back to cockpit; the outbound captain that was waiting to come on board noticed the aircraft movement and rushed to cockpit to verify or set brakes. Aircraft stopped within inches of contacting jet way. There was no damage to aircraft and no passengers were hurt. Once maintenance checked aircraft and determined that is was unaffected; we were towed forward and deplaned the rest of passengers. First officer admitted releasing brake handle to help cool hot brakes. He assumed wheels were chocked even though ramp was closed. He was also unaware of aircraft movement as he was downloading flight plan from i-pad for the next flight and had head buried in his lap. Our procedures are a bit flawed as you don't really know if aircraft is chocked even though they give you the chocks in signal. I find myself more than not looking at aircraft as I walk from gate to gate to make sure it is indeed chocked. I also remember that several years ago we used to never release brakes even if they were hot. On other fleets it is a common procedure to release brakes all the time whether brakes are hot or not.

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.