Date: 201908
Local time of day: 1201-1800
Location: ZZZ.Airport, US
Aircraft: B787-800
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Taxi
ATC / advisory: Ramp ZZZ
Reporter organization: Air Carrier
Reporter function: Captain; Pilot Flying
Reporter qualification: Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Human factors: Communication Breakdown
Anomaly: Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Object
Detector: Person Gate Agent / CSR; Person Flight Crew
When detected: Taxi
Result: General None Reported / Taken
Contributing factors: Company Policy; Human Factors; Procedure
Primary problem: Procedure

Narrative: On parking at the gate; I approached the gate with the right engine shut down. I was marshalled in by the ground crew. As we approached the gate parking position; the Guideman signaled for me to stop the aircraft and park the brakes. All signals for a completed taxi in and parking operation per normal operations; I signaled to him that the parking brake was set. Very shortly thereafter and just prior to shutting down my left engine; the Guideman signaled to me to come forward. Under his guidance and following his signals; I released the parking brake and began to move the aircraft forward. Within a few seconds the Guideman then frantically signals for me to stop the aircraft. I comply. He then leaves his position and walks away from the aircraft. I am under the impression that the parking operation is (again) complete. There is confusion with the Agent regarding her ability to mate the jetbridge with the aircraft. She signals to me that she is unable to do so. With my left engine still running; I am waiting for a confirmation that the parking operation is; once again complete. Another ramp worker (Ramp Worker B) then walks up the jetbridge stairs from the ramp and begins to have a conversation with the Agent. He signals to me to shut down my engine. I comply. Cargo doors are opened by the ground crew at this point.The Agent is still not able to mate the jetbridge to the aircraft. Shortly thereafter; we notice a tow bar is being brought to the aircraft. Ramp Worker B eventually connects to the flight interphone and explains to me that they have stopped the aircraft short of the correct position and they will need to tow the aircraft forward to the correct position. He further explains that after the parking brake is released he must push the aircraft back approximately a ft. first; then tow us forward to the correct position. I ask him why he needs to push the aircraft back first. He explains that we have run over a chock and they need to remove it first before towing the aircraft forward. This operation takes place. Eventually; the aircraft is towed to the correct position and the Agent is able to mate the jetbridge with the aircraft. This was a very dangerous operation led by the Guideman. By following the Guideman's instructions; not only did I taxi over a chock; but I could have easily injured or killed a ramp worker. This Guideman placed the entire ground crew in jeopardy and in a life threatening position. This is not acceptable.




Synopsis: B787 Captain reported receiving non-standard instructions from the ground crew; causing the aircraft to taxi over a chock and park in an improper position.