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Air carrier flight crew reported misinterpreting a hand signal from the ground crew resulting in the aircraft moving unexpectedly before re-applying the brakes.
| Attributes | |
| ACN | 1512306 |
| Time | |
| Date | 201801 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Widebody Transport |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument |
| Events | |
| Anomaly | Deviation - Procedural Published Material / Policy Ground Event / Encounter Loss Of Aircraft Control |
Narrative:
We pulled into gate and the captain set the parking brake. The marshaller gave a T type signal trying to indicate ground power but the captain mistook it for release brakes. He released the brakes as I was returning from opening the doors. I noticed we were moving and said we are moving and we subsequently lost the ground power connection. The captain quickly put the brakes on and maintenance plugged in to tell us over the intercom that we rolled approximately 15 feet. No damage or injury was noted and we had a debrief with maintenance personnel and the ramp manager to discuss the event and marshalling signals. Cause [was] human error from just momentary confusion. Suggestions: verify signals especially during longer days when we departed 3 hours late.
Original NASA ASRS Text
Title: Air carrier flight crew reported misinterpreting a hand signal from the ground crew resulting in the aircraft moving unexpectedly before re-applying the brakes.
Narrative: We pulled into gate and the Captain set the parking brake. The marshaller gave a T type signal trying to indicate ground power but the Captain mistook it for release brakes. He released the brakes as I was returning from opening the doors. I noticed we were moving and said we are moving and we subsequently lost the ground power connection. The captain quickly put the brakes on and Maintenance plugged in to tell us over the intercom that we rolled approximately 15 feet. No damage or injury was noted and we had a debrief with maintenance personnel and the ramp manager to discuss the event and Marshalling signals. Cause [was] human error from just momentary confusion. Suggestions: Verify signals especially during longer days when we departed 3 hours late.
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.