Commercial Fixed Wing
Training / Qualification; Communication Breakdown; Situational Awareness
Conflict Ground Conflict; Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Other / Unknown
Flight Crew Returned To Gate; General Flight Cancelled / Delayed; General Maintenance Action
Procedure; Human Factors
Aircraft X pushed back from Gate E8. As the aircraft was being pushed straight back [another company] tug with carts disobeyed the Wing Walker signal to stop for the aircraft being pushed and continued to drive behind the aircraft. Once the tug was directly behind the aircraft they finally stopped which prevented the aircraft from being pushed. The pushback Driver had to stop abruptly to prevent hitting the tug and carts. This caused the shear pin on the tow bar to break. Supervisor and Maintenance was called to the incident. Maintenance determined the aircraft was good to fly and the ramp crew changed out the tow bar and completed the push.
Ramp worker reported that during pushback; a baggage tug blocked the aircraft; causing the pushback driver to stop abruptly and break the tow bar shear pin.