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After parking at the gate an air carrier large turbojet was chocked and asked to release brakes. The aircraft began to roll backwards due to chocks not holding.
| Attributes | |
| ACN | 1403841 |
| Time | |
| Date | 201611 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | BOS.Airport |
| State Reference | MA |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Total 890 Flight Crew Type 890 |
| Person 2 | |
| Function | Ramp |
| Events | |
| Anomaly | Deviation - Procedural Published Material / Policy Ground Event / Encounter Other / Unknown |
Narrative:
After blocking in at boston; with the engines shut down and the parking brake set; I received a 'chocks in' signal from the ground marshaller. I released the parking brake and then went about the business of completing the log book. Several seconds later; I heard the first officer urgently stating that the aircraft was moving. I immediately applied the brakes; but not until after the aircraft had rolled about 20 feet backwards and with pretty good speed. I reset the parking brake. Through the flight deck door; I heard what sounded like startled flight attendants/passengers; so I immediately called to the back to ensure everyone was fine. No one was injured. Apparently; the nose chocks were placed in position correctly; but without realizing there was ice under them. It was late at night; so this may have contributed to not seeing the ice. Additionally; both the first officer (first officer) and I were tired.this could have resulted in serious injury and aircraft damage. From now on; I plan to take an extra minute to ensure the aircraft is not moving after releasing the parking brake. I would also suggest chocking more than one wheel in winter conditions.
Original NASA ASRS Text
Title: After parking at the gate an air carrier large turbojet was chocked and asked to release brakes. The aircraft began to roll backwards due to chocks not holding.
Narrative: After blocking in at Boston; with the engines shut down and the parking brake set; I received a 'chocks in' signal from the ground marshaller. I released the parking brake and then went about the business of completing the log book. Several seconds later; I heard the First Officer urgently stating that the aircraft was moving. I immediately applied the brakes; but not until after the aircraft had rolled about 20 feet backwards and with pretty good speed. I reset the parking brake. Through the flight deck door; I heard what sounded like startled flight attendants/passengers; so I immediately called to the back to ensure everyone was fine. No one was injured. Apparently; the nose chocks were placed in position correctly; but without realizing there was ice under them. It was late at night; so this may have contributed to not seeing the ice. Additionally; both the FO (First Officer) and I were tired.This could have resulted in serious injury and aircraft damage. From now on; I plan to take an extra minute to ensure the aircraft is not moving after releasing the parking brake. I would also suggest chocking more than one wheel in winter conditions.
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.