ASN Wikibase Occurrence # 134002
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| Date: | Monday 23 March 1992 |
| Time: | 16:30 LT |
| Type: |  Ayres S-2R-T34 Turbo Thrush |
| Owner/operator: | Old River Crop Dusting, Inc |
| Registration: | N59SK |
| MSN: | T34-008 |
| Year of manufacture: | 1979 |
| Total airframe hrs: | 10781 hours |
| Engine model: | P&W PT6-34 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Bakersfield, CA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
WITNESSES OBSERVED PARTS FALL FROM THE AIRPLANE DURING THE INITIAL SWATH RUN. AS THE AIRPLANE ENTERED A RIGHT CLIMBING TURN TO NEGOTIATE 30-FT HIGH TELEPHONE WIRES, IT ENTERED INTO A LEFT WING-OVER AND NOSED DOWN INTO THE GROUND. THE LEFT WING SPAR HAD SEPARATED, AND THE FRACTURED SURFACES DISCLOSED EVIDENCE OF CORROSION. THE 16-FT LONG LOWER STEEL SPAR CAP HAD SEPARATED FROM THE ALUMINUM WING SPAR WEB ALONG THE ENTIRE LENGTH. FRACTURE SURFACES IN THE HUCK LOCKBOLT TYPE FASTENERS ON THE SPAR DISCLOSED EVIDENCE OF CORROSION. THE AREA OF THE HUCK LOCKBOLT CORROSION IS NOT NOTICEABLE BY VISUAL INSPECTION. THE CORROSION IS MASKED BY THE STEEL SPAR CAP. NONE OF THE HUCK LOCKBOLT COLLARS WERE LOOSE OR MISSING. THE AIRPLANE HAD COMPLETED AN 100-HR INSPECTION 71 HRS BEFORE THE ACCIDENT. AT THE TIME OF THE INSPECTION THERE WERE NO DISCREPANCIES NOTED WITH THE WING SPAR.
Probable Cause: A CATASTROPHIC WING SPAR FAILURE PRECIPITATED BY HIDDEN CORROSION AND THE RESTRICTED VIEW OF THE AREA OF CORROSION BY THE AIRPLANE'S WING STRUCTURE.
Accident investigation:
 |
|
Sources:
NTSB LAX92FA149
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 11-Apr-2024 08:23 | ASN Update Bot | Updated [Time, Other fatalities, Source, Narrative, Category, Accident report] |
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