ASN Wikibase Occurrence # 357847
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| Date: | Sunday 14 January 1996 |
| Time: | 17:00 LT |
| Type: |  Ercoupe 415C |
| Owner/operator: | Eastern Shore Aero |
| Registration: | N87424 |
| MSN: | 597 |
| Year of manufacture: | 1946 |
| Total airframe hrs: | 1677 hours |
| Engine model: | Continental C85-12 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Hurlock, MD -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Easton, MD (KESN) |
| Salisbury, MD (KSBY) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot stated that the airplane was in cruise flight at 1,500 feet MSL when the propeller separated from the airplane. The pilot made an emergency landing in a snow covered field. Upon touchdown in 18-inch deep snow, the nose wheel collapsed. The separated propeller assembly and the attached forward portion of the crankshaft flange were located, and examined in the NTSB laboratory. Postaccident inspection of the crankshaft revealed a spiral crack that intersected the fracture at the bottom corner of a keyway. Further examination showed that the cracks were filled with a iron nitride white layer. Maintenance records indicated that the main journals and pins of the crankshaft were ground, nitrided, inspected, and returned for service, in October, 1994.
Probable Cause: inadequate inspection by maintenance personnel which failed to detect a fatigue crack, and resulted in an in-flight crankshaft fracture and propeller assembly separation. A related factor was the deep snow encountered during the subsequent forced landing.
Accident investigation:
 |
|
Sources:
NTSB BFO96LA038
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Mar-2024 07:13 | ASN Update Bot | Added |
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