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B777 tow tractor driver reports the tractor bucking when it is down shifted causing the tow bar to bend and separate from the aircraft. Aircraft tow lug was damaged.
| Attributes | |
| ACN | 950623 |
| Time | |
| Date | 201105 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | LAX.Airport |
| State Reference | CA |
| Aircraft 1 | |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Taxi |
| Component | |
| Aircraft Component | Nose Gear |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Ground Event / Encounter Other / Unknown |
Narrative:
[I was] towing B777 aircraft from maintenance to the terminal with tow tractor. Tow bar was latched to aircraft; bypass pin installed. Proceeded to tow aircraft and up shifted to provide a smooth tow. Tractor started to lug at an incline at charlie and charlie 5 intersection. [I] down shifted the tractor. The tractor bucked and the aircraft disengaged from the tow bar. When the aircraft disengaged from the tow bar it bent the tow head up nearly 90 degrees; damaged the wheels on the tow bar and broke the shear bolts. The brake rider applied brakes of the aircraft. Visual inspection showed 2 gouges on the tow fitting. Replaced tow bar and continued tow to gate. Tow lug was swapped from the rear of the nose gear and carried forward. No other damage noted.
Original NASA ASRS Text
Title: B777 tow tractor driver reports the tractor bucking when it is down shifted causing the tow bar to bend and separate from the aircraft. Aircraft tow lug was damaged.
Narrative: [I was] towing B777 aircraft from Maintenance to the terminal with tow tractor. Tow bar was latched to aircraft; bypass pin installed. Proceeded to tow aircraft and up shifted to provide a smooth tow. Tractor started to lug at an incline at Charlie and Charlie 5 Intersection. [I] down shifted the tractor. The tractor bucked and the aircraft disengaged from the tow bar. When the aircraft disengaged from the tow bar it bent the tow head up nearly 90 degrees; damaged the wheels on the tow bar and broke the shear bolts. The brake rider applied brakes of the aircraft. Visual inspection showed 2 gouges on the tow fitting. Replaced tow bar and continued tow to gate. Tow lug was swapped from the rear of the nose gear and carried forward. No other damage noted.
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.