ASN Wikibase Occurrence # 193711
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| Date: | Saturday 18 February 2017 |
| Time: | 16:57 |
| Type: |  Mooney M20E Chaparral |
| Owner/operator: | Private |
| Registration: | N6807V |
| MSN: | 21-0003 |
| Year of manufacture: | 1971 |
| Total airframe hrs: | 3776 hours |
| Engine model: | Lycoming IO-360-A1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Stone County, MO -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Ozark, MO (18MO) |
| Ozark, MO (18MO) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The flight instructor reported that, after takeoff on the instructional flight, the engine was running smoothly before it “missed” or “hesitated.” The flight instructor initiated a return to the airport; shortly thereafter, the engine began to make loud noises and vibrate, ultimately experiencing a total loss of power. The flight instructor performed a forced landing to a field, resulting in substantial damage.
Examination of the engine revealed that the No. 2 connecting rod had failed. Remnants of the connecting rod bearing found within the oil pan exhibited evidence of bearing failure and extrusion. Due to the extensive secondary engine damage, the reason for the failure of the No. 2 bearing could not be determined. The engine was overhauled 11 years 6 months before the accident, and had accumulated about 16 hours of flight time in the preceding 3 years. Guidance published by the engine manufacturer stated that abnormal wear could occur during engine start due to a loss of protective oil film after an extended period of inactivity and recommended that all engines not in continuous service be overhauled every 12 years.
Probable Cause: The failure of the engine No. 2 connecting rod bearing for reasons that could not be determined due to the extensive secondary engine damage.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=6807v
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 19-Feb-2017 04:33 | Geno | Added |
| 08-Sep-2017 19:49 | ASN Update Bot | Updated [Time, Other fatalities, Nature, Departure airport, Destination airport, Source, Damage, Narrative] |
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