ASN Wikibase Occurrence # 43723
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| Date: | Saturday 28 July 2007 |
| Time: | 11:48 |
| Type: |  Taylorcraft BF-12 |
| Owner/operator: | Private |
| Registration: | N13060 |
| MSN: | 2786 |
| Total airframe hrs: | 5445 hours |
| Engine model: | Continental C-85 |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | West Linn, OR -
 United States of America
|
| Phase: | Take off |
| Nature: | Training |
| Departure airport: | Lake Oswego, OR (3S1) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The 67-year-old float equipped Taylorcraft crashed into a river following a wing lift strut separation. A witness reported that it appeared the airplane was going to land; however, just before touchdown it began to ascend and enter a left turn. The witness said that shortly after entering the turn, the airplane's left wing buckled and folded back against the fuselage. The airplane then entered an uncontrolled descent to impact with the water. Visual examination of the fractured wing strut attachment fitting showed substantial corrosion and pitting throughout the assembly. Further examination utilizing a scanning electron microscope (SEM) revealed that the left wing strut fitting fractured due to extensive corrosion followed by fatigue cracking. The lower side of the fitting had corrosion pitting that extended from the interior of the fitting completely through the thickness in some areas. The upper side of the fitting was also thinned due to corrosion. Several areas of the fracture surfaces showed oxidation consistent with progressive crack growth over an extended period of time, and fatigue features were found in areas not damaged by rubbing or corrosion. The most recent annual inspection was completed 2 months prior to the accident by the owner, who held an airframe and powerplant technician license. It was not determined which one of the two pilots, an airline transport pilot/certified flight instructor (also the owner of the airplane) seated in the left front seat or the airline transport pilot/certified flight instructor (CFI) seated in the right front seat, was manipulating the flight controls when the accident occurred.
Probable Cause: The corrosion, fatigue fracture, and subsequent separation of the left wing lift strut attachment fitting. Also causal was the inadequate maintenance and annual inspection by the owner/pilot/mechanic.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20070808X01147&key=1
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Oct-2008 00:45 | ASN archive | Added |
| 21-Dec-2016 19:24 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 04-Dec-2017 18:43 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Source, Narrative] |
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