Narrative:

Aircraft taxied into gate (marshalled by employee xx) and employee xx gave stop signal. Captain stopped aircraft. Employee xy approached nose landing gear to chock. Placed rear tire chock and captain powered up engine uncommanded. Aircraft moved forward 2-3 feet. Employee xx jumped back from medium large transport (main landing gear) chocking to avoid injury. Employee xy rolled away from aircraft to avoid injury. Employee xx still held same stop command.once aircraft stopped for second time; employee xx and employee xy approached aircraft to chock after additional all clear given by employee xx. Employee xy and employee xx (separately) spoke to flight crew and questioned why move aircraft [the] 2nd time. Captain explained he's been doing this for 26 years and knows what to do. Again I asked why moved when given stop signal.he stated 'I thought he needed me to come forward because he was only holding the x or really v with one hand. It looked like a v to me instead of an x.'I asked him specifically if he was even remotely unclear about the command being given; why presume and just move the aircraft? He said he knew what the command was... He said 'I thought' multiple times. He said he thought that we wanted him to move forward. We don't do 'I thought'. If unclear; do not move the aircraft and wait for a clear concise command. He would neither agree nor disagree. We both maintained respectfulness throughout; but it was obvious to me he felt no fault or misjudgment.

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Original NASA ASRS Text

Title: Flight crew ignored ground personnel commands to stop aircraft.

Narrative: Aircraft taxied into gate (Marshalled by Employee XX) and Employee XX gave stop signal. Captain stopped aircraft. Employee XY approached nose landing gear to chock. Placed rear tire chock and Captain powered up engine uncommanded. Aircraft moved forward 2-3 feet. Employee XX jumped back from MLG (Main Landing Gear) chocking to avoid injury. Employee XY rolled away from aircraft to avoid injury. Employee XX still held same stop command.Once aircraft stopped for second time; Employee XX and Employee XY approached aircraft to chock after additional all clear given by Employee XX. Employee XY and Employee XX (separately) spoke to flight crew and questioned why move aircraft [the] 2nd time. Captain explained he's been doing this for 26 years and knows what to do. Again I asked why moved when given stop signal.He stated 'I thought he needed me to come forward because he was only holding the x or really v with one hand. It looked like a v to me instead of an x.'I asked him specifically if he was even remotely unclear about the command being given; why presume and just move the aircraft? He said he knew what the command was... He said 'I thought' multiple times. He said he thought that we wanted him to move forward. We don't do 'I thought'. If unclear; do not move the aircraft and wait for a clear concise command. He would neither agree nor disagree. We both maintained respectfulness throughout; but it was obvious to me he felt no fault or misjudgment.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.