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B737 captain reported on pushback a miscommunication from the ground crew resulting in an uncontrolled movement of aircraft.
| Attributes | |
| ACN | 1660760 |
| Time | |
| Date | 201906 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Taxi |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 198 Flight Crew Total 1727 Flight Crew Type 2724 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Ground Event / Encounter Loss Of Aircraft Control |
Narrative:
At [time] received 'ramp ready' and completed before push checklist. Received push clearance and communicated with ramp that 'brakes released; cleared to push'. Normal push forces were felt for several seconds followed by a slightly unusual jolt. The tug brought the aircraft to a relatively quick stop. I queried 'did something break'? The tug driver responded; 'I think maybe the shear pin broke'. The aircraft was stationary and I asked the first officer to cancel our push clearance with ZZZ ramp control. I told the ramp 'pushback canceled'. I don't recall receiving a response from ramp. After approximately 15 seconds; the aircraft began moving aft and I restated 'stop. Pushback canceled. Cancel push.' the tug driver stated 'set brakes. Set brakes!' the aircraft had moved 3-6 feet in this time. Normal pedal braking was applied to smoothly stop the aircraft and the parking brake was set. Ramp then stated; 'I thought you had set your brakes'. I replied 'I wasn't told to set brakes'. A new tow bar was located; maintenance arrived and provided an inspection; and pushback continued within 3-5 mins. No further issues.
Original NASA ASRS Text
Title: B737 Captain reported on pushback a miscommunication from the ground crew resulting in an uncontrolled movement of aircraft.
Narrative: At [time] received 'ramp ready' and completed before push checklist. Received push clearance and communicated with ramp that 'brakes released; cleared to push'. Normal push forces were felt for several seconds followed by a slightly unusual jolt. The tug brought the aircraft to a relatively quick stop. I queried 'did something break'? The tug driver responded; 'I think maybe the shear pin broke'. The aircraft was stationary and I asked the First Officer to cancel our push clearance with ZZZ ramp control. I told the ramp 'pushback canceled'. I don't recall receiving a response from ramp. After approximately 15 seconds; the aircraft began moving aft and I restated 'Stop. Pushback canceled. Cancel Push.' The tug driver stated 'Set brakes. Set Brakes!' The aircraft had moved 3-6 feet in this time. Normal pedal braking was applied to smoothly stop the aircraft and the parking brake was set. Ramp then stated; 'I thought you had set your brakes'. I replied 'I wasn't told to set brakes'. A new tow bar was located; maintenance arrived and provided an inspection; and pushback continued within 3-5 mins. No further issues.
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.