ASN Wikibase Occurrence # 35242
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| Date: | Friday 21 May 1993 |
| Time: | 11:45 LT |
| Type: |  Piper PA-25 |
| Owner/operator: | Shenandoah Flight Services,inc |
| Registration: | N6453Z |
| MSN: | 25-640 |
| Year of manufacture: | 1961 |
| Total airframe hrs: | 5375 hours |
| Engine model: | Lycoming O-360-C2A |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Essex, IA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | Shenandoah, IA (SDA |
| (KSDA) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE AIRPLANE WAS ON A SWATH RUN, WHEN THE RIGHT WING BUCKLED, AND THE AIRPLANE ROLLED INTO A DESCENT AND CRASHED. A POST-ACCIDENT EXAMINATION OF THE AIRPLANE REVEALED THAT THE FORWARD SPAR FUSELAGE ATTACHMENT ASSEMBLY FOR THE RIGHT WING HAD FAILED FROM FATIGUE AT THE CLEVIS EARS. ON 9/21/91, THERE WAS A SIMILAR FAILURE OF A PIPER PA-25. ON 5/13/92, THE NTSB MADE AN URGENT RECOMMENDATION TO THE FAA THAT AN AIRWORTHINESS DIRECTIVE (AD) BE ISSUED FOR PIPER PA-25 AIRPLANES TO BE INSPECTED IMMEDIATELY FOR CORROSION AND CRACKING OF THE CLEVIS EARS; THAT IF SUCH CORROSION OR CRACKING WAS FOUND, REPAIRS BE MADE; AND THAT PERIODIC INSPECTION REQUIREMENTS BE ESTABLISHED TO DETECT CRACKS BEFORE THEY BECOME CRITICAL. ON 7/16/92, THE FAA AGREED WITH THE INTENT OF THE RECOMMENDATION, BUT AS OF THE DATE OF THE ACCIDENT, NO INSPECTION PROCEDURE WAS IN EFFECT.
Probable Cause: FATIGUE FAILURE OF THE FORWARD SPAR FUSELAGE ATTACHMENT ASSEMBLY FOR THE RIGHT WING. A FACTOR RELATED TO THE ACCIDENT WAS: THE LACK OF A DIRECTED INSPECTION PROCEDURE THAT COULD HAVE BEEN PROVIDED WITH THE ISSUANCE OF AN AIRWORTHINESS DIRECTIVE.
Accident investigation:
 |
|
Sources:
NTSB CHI93DCD02
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 10-Apr-2024 13:48 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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