Accident Pitts S-1S N9AQ,
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ASN Wikibase Occurrence # 173578
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Date:Saturday 3 January 2004
Type:Silhouette image of generic PTS1 model; specific model in this crash may look slightly different    
Pitts S-1S
Registration: N9AQ
MSN: 568-H
Total airframe hrs:1486 hours
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Location:Burleson, TX -   United States of America
Phase: Landing
Departure airport:Burleson, TX (FWS)
Destination airport:Burleson, TX (3TX9)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
While landing at a private airstrip, the right main gear separated from the aircraft. Shortly after touchdown, the right gear strut dug into the grass for approximately 75 feet before the aircraft nosed over and came to rest inverted. Inspection of the amateur-built aircraft revealed that there was an old crack on the flange where it was welded to the axle nut. A new fracture had propagated from the ends of this crack around the lower axle shaft bolt, causing the other 3 remaining bolts to fracture and separate. Examination also revealed that the axle shaft had been cut off next to the backing plate flange and an axle shaft similar to what is used on a Cessna spring gear was bolted to the flange with four quarter-inch bolts. The FAA Inspector found the separated wheel with a piece of the flange still attached to it by one of the bolts. The flange was able to swivel around the bolt, suggesting that the bolt (and the 3 other bolts) was improperly torqued.
Probable Cause: The separation of the right main gear wheel, during landing, due to the improper maintenance by unknown maintenance personnel on the right main landing gear assembly.




Revision history:

04-Feb-2015 21:37 Noro Added
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
07-Dec-2017 17:35 ASN Update Bot Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative]

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