Accident Boeing 737-3B7 N529AU, 27 Jul 2006
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ASN Wikibase Occurrence # 292003
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Time:08:45 LT
Type:Silhouette image of generic B733 model; specific model in this crash may look slightly different    
Boeing 737-3B7
Owner/operator:US Airways
Registration: N529AU
MSN: 24411/1713
Fatalities:Fatalities: 0 / Occupants: 78
Aircraft damage: Substantial
Location:Pittsburgh, Pennsylvania -   United States of America
Phase: Unknown
Nature:Passenger - Scheduled
Departure airport:Pittsburgh International Airport, PA (PIT/KPIT)
Destination airport:WEST PALM BEACH, FL (PBI
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
During pushback, the airplane was seen to "bounce" up and down both at the nose and the tail, before the nose gear collapsed. Examination of the airplane revealed a broken lower drag brace that was buckled in compression, and fractured due to overstress. The tug was examined and the gear shift lever was found to be defective. It would not lock in the neutral gate, and could be moved easily through the gate between the forward and reverse gears. In addition, the tug experienced "hesitation and hard jerks" when shifting from forward to reverse. Skid marks at the scene were the same width as the tug's wheelbase, and were consistent with sudden engagement of the transmission.

Probable Cause: The airplane tug driver's inadvertent movement of the tug gear shift lever from forward to reverse, which resulted in the nose landing gear collapse. Contributing to the accident was the defective gear shift lever.



Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 11 months
Download report: Final report

Revision history:

08-Oct-2022 13:22 ASN Update Bot Added

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