ASN Wikibase Occurrence # 284260
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| Date: | Monday 17 September 2007 |
| Time: | 16:45 LT |
| Type: | Sherpa Aircraft Sherpa |
| Owner/operator: | Private |
| Registration: | N1415B |
| MSN: | 0012 |
| Engine model: | Lycoming IO-720 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Scappoose, Oregon -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | Scappoose Industrial Airpark, OR (KSPB) |
| Scappoose Industrial Airpark, OR (KSPB) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was a potential buyer of the airplane and was flying it on short final approach. He said that he attempted to correct for a sink rate, which included pulling back full aft on the control stick to arrest the descent. The airplane's nose then abruptly pitched down about 45 degrees and the airplane struck the runway. A visual examination of the airplane's flight control system by Federal Aviation Administration (FAA) inspectors revealed that the flight control stick gimbal mechanism had fractured and the control stick was separated from the mechanism. The flight control stick gimbal mechanism and a portion of the fuselage structure were shipped to the Safety Board's Materials Laboratory for a metallurgical examination. According to the metallurgical examination, the fatigue cracking of the fuselage tube structure in the area of the control stick gimbal mechanism emanated from the root of a weld in an area between tube joints. The Safety Board's senior metallurgist reported that the fatigue had propagated through approximately 30 percent of the wall thickness. The fatigue crack was located near an area of the fuselage tube that contained a 0.7-inch-long region of incomplete weld penetration at the root of the weld.
Probable Cause: A loss of aircraft pitch control due to the fatigue failure of the fuselage tube structure at the flight control stick gimbal mechanism due to an incomplete weld penetration at the root of the weld.
Accident investigation:
 |
|
Sources:
NTSB LAX07LA280
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 30-Sep-2022 14:01 | ASN Update Bot | Added |
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