B737-700
Flight Crew Last 90 Days 220
Communication Breakdown; Training / Qualification
Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Other / Unknown
Flight Crew Returned To Gate
Airport; Human Factors; Procedure
Normal marshaling into gate; stopped normally; normal hand signals to include chocks in signal from Marshaller. At that point I released the parking brake and called for the Parking Checklist. While accomplishing the checklist; I notice movement in my left peripheral vision; glanced up; saw the jetway moving forward; smoothly applied brakes; and set the parking brake. The aircraft started rolling backward and either pushed the rear chock out of place; the chock was incorrectly positioned; or not in position.  Rampers came on the intercom; hooked up the tow bar; and towed the aircraft forward to the stop point; and I set the parking brake for the remainder of the turn. There was a briefing page change which I reviewed before reporting to the aircraft and reviewed it once again enroute. I overlooked the notice to keep parking brakes set at [specific gates at this airport; including the one we wereparked at]. A more vigilant review of the briefing page on my part would have prevented this. Recommend that briefing pages with gates like this have the gate list include bold lettering to draw additional attention to special gate requirements.
Parked at Gate XXX; Ramper gave us the chocks in signal. Captain released the parking brake and we began the Parking Checklist. After a few seconds; the Captain noticed the aircraft was rolling backward. He quickly set the parking brake and the aircraft stopped. We communicated with the Rampers via headset and they pulled us back into the gate. More vigilance by the Ground Crew giving hand signals at an appropriate time. More vigilance for the flight crew during times when we are heads down accomplishing checklists.
B737 flight crew reports rolling back after parking at the gate with chocks in. The brakes are applied and the ground crew tugs the aircraft back to the spot. The company briefing page indicates that at this gate and another the company uses at this airport require the parking brakes to remain set at all times.