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One lead; one inspector and three mechanics report on their involvement with a B737-700 that rolled backwards; off of portable weigh scales; with both elevators striking the hangar doors and the vertical stabilizer contacting the hangar upper beams.
| Attributes | |
| ACN | 854946 |
| Time | |
| Date | 200910 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Fuselage Tail Cone |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Person 2 | |
| Function | Technician |
| Qualification | Maintenance Powerplant Maintenance Airframe |
| Events | |
| Anomaly | Deviation - Procedural Weight And Balance Deviation - Procedural Published Material / Policy Ground Event / Encounter Other / Unknown |
Narrative:
The crew was in the process of weighing the aircraft. We took the aircraft off the scales; reset the scales; and pushed the plane back on the scales for the second weigh. The tug driver called to set the brakes. The brakes were set as indicated by the brake operator. The man on the tow bar asked if the brakes were set. Since I could see both the tug driver and the brake operator; I indicated the brakes were set. I was standing by the tow bar at the tug side; on the right hand side; looking at the aircraft. He released the tow bar; and as soon as he released the tow bar; the aircraft began to roll backwards. The next thing that happened; the emergency slide on the service door fell to the ground and everyone started screaming. Plane rolling. A chalk was thrown under the wheel (left side). The plane rolled over it and did not stop or slow down. Plane stopped when it hit the hangar door.
Original NASA ASRS Text
Title: One Lead; one Inspector and three Mechanics report on their involvement with a B737-700 that rolled backwards; off of portable weigh scales; with both elevators striking the hangar doors and the vertical stabilizer contacting the hangar upper beams.
Narrative: The crew was in the process of weighing the aircraft. We took the aircraft off the scales; reset the scales; and pushed the plane back on the scales for the second weigh. The tug driver called to set the brakes. The brakes were set as indicated by the brake operator. The man on the tow bar asked if the brakes were set. Since I could see both the tug driver and the brake operator; I indicated the brakes were set. I was standing by the tow bar at the tug side; on the right hand side; looking at the aircraft. He released the tow bar; and as soon as he released the tow bar; the aircraft began to roll backwards. The next thing that happened; the emergency slide on the service door fell to the ground and everyone started screaming. Plane rolling. A chalk was thrown under the wheel (left side). The plane rolled over it and did not stop or slow down. Plane stopped when it hit the hangar door.
Data retrieved from NASA's ASRS site as of April 2012 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.