ASN Wikibase Occurrence # 131843
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| Date: | Sunday 15 August 1999 |
| Time: | 14:00 LT |
| Type: |  Mooney M20E |
| Owner/operator: | Michael A. Robinson |
| Registration: | N3243F |
| MSN: | 670036 |
| Year of manufacture: | 1967 |
| Total airframe hrs: | 1412 hours |
| Engine model: | Lycoming IO-360 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Prattsburg, NY -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Elmira, NY (KELM) |
| Rochester, NY (KROC) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
About 20 minutes into the flight, the pilot heard a loud bang, then saw an object go by the windshield. The airplane started to shake so badly that the door popped open, and oil appeared on the windshield. The pilot shut down the engine, the shaking ceased, and the pilot performed a forced landing to a hilly field. Post-flight examination revealed that approximately 27 inches of one propeller blade was missing. Examination of the remaining fracture surface revealed features typical of fatigue cracking, and metallographic examination of the origin area revealed the grain structure and the presence of intergranular corrosion cracks. Review of maintenance logbooks failed to reveal any indication of 'prop strike,' overspeed, or any other catastrophic event to the propeller. On August 20, 1989, the propeller was removed for overhaul, and for compliance with AD 77-12-06. Since then, it had logged about 530 hours of operation. There were no requirements for mandatory propeller corrosion inspections.
Probable Cause: Propeller blade separation, resulting from fatigue cracking initiated by intergranular corrosion. A factor was the lack of propeller blade corrosion inspection requirements.
Accident investigation:
 |
|
Sources:
NTSB NYC99LA202
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 14-Dec-2017 08:46 | ASN Update Bot | Updated [Departure airport, Destination airport, Source, Narrative] |
| 07-Apr-2024 18:44 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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