A319
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 158.35; Flight Crew Total 4059.02; Flight Crew Type 2623.62
Ground Event / Encounter Loss Of Aircraft Control; Inflight Event / Encounter Weather / Turbulence
Flight Crew Took Evasive Action; Flight Crew Regained Aircraft Control
Weather; Procedure
After parking brake set at gate; aircraft continued to move forward very slowly as englines [were shutting down] with ince on ramp. Parking brake was set with good pressure.  Aircraft moved forward approximately 3 feet.  Most likely cause of movement was ice of ramp and residual thrust from engines as they spooled down.
After taxi in; the Captain followed the Marshaller's command to stop the aircraft. Captain set the parking brake. However; before the engines were shut down; we noticed a very slight aircraft movement forward. We shut down the engines which arrested the movement. We think we slid approximately 3 feet forward with the park brake set.
A319 flight crew reported the aircraft slide forward with the parking brake set at the gate due to ramp conditions.