B737-700
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 163
Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Other / Unknown; Inflight Event / Encounter Weather / Turbulence
Flight Crew Took Evasive Action
Weather; Airport; Company Policy
We taxied to our Gate on an icy ramp. The gate next door to ours; YYY; had a note in the [Company manual] about it being a gate on a sloped ramp; please leave the parking brake set while at the gate. Our gate; XXX had no such note in the [manual].After shutting down both engines and receiving the wheel chocks set signal from the ground Marshaler; I released the aircraft parking brake. The aircraft slid backwards approximately 13 FT before I set the parking brake again.
B737NG Captain reported releasing the parking brake at the gate once the wheel chocks signal was received; then the aircraft slid back approximately 13 feet.