B737-900
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 119; Flight Crew Total 24686; Flight Crew Type 12453
Communication Breakdown; Situational Awareness; Time Pressure; Workload
Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Weight And Balance; Ground Event / Encounter Other / Unknown
Flight Crew Took Evasive Action
Company Policy; Aircraft; Procedure
Upon arrival no ACARS message per prior bulletin of potential aft Center of Gravity (CG) and aircraft tipping during deplaning. I felt aircraft starting to rise at gate and at the same time a mechanic rushed in and said aircraft tail was settling quickly. I immediately had as many passengers as possible come [forward] from [the back] of the aircraft and called for the jetway operator to move the canopy back as soon as possible so L 1 door would not catch and get damaged. Mechanic raced back down to ramp after I suggested to tell ramp to immediately stop unloading forward cargo bin and to get everything out of aft cargo.
A B737-900 crew parked and with no ACARS AFT CG or TIPPING alert; deplaning began. The Captain felt aircraft movement in time to move people forward and cease forward cargo baggage removal which prevented tipping damage.