ASN Wikibase Occurrence # 297459
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| Date: | Saturday 30 March 2002 |
| Time: | 15:25 LT |
| Type: |  Mooney M20F |
| Owner/operator: | Private |
| Registration: | N9530M |
| MSN: | 670107 |
| Year of manufacture: | 1967 |
| Total airframe hrs: | 3756 hours |
| Engine model: | Lycoming IO-360-A1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Grapeland, Texas -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | Livingston, TX (00R) |
| Dallas-Addison Airport, TX (ADS/KADS) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Approximately 25 minutes after departure, while in cruise flight at 1,500 feet msl a sudden vibration shook the airplane. The pilot scanned the engine instruments and everything "appeared to be normal." Subsequently, oil covered the windscreen, which severely limited forward visibility. The pilot initiated a forced landing to a grass field with the landing gear in the retracted position. During the landing, the airplane bounced, and the left wing "skimmed" across the top of a metal cattle feeder before impacting the ground, and the airplane spun around approximately 450 degrees before coming to rest upright. Examination of the engine revealed two holes on the top and bottom of the engine case between the #1 and #2 cylinders. The #2 connecting rod was found sticking out of the top hole and was not attached to the crankshaft. The #2 connecting rod cap was found separated from the connecting rod. The #2 connecting rod cap attachment bolts, nut, and both bearings were missing and not located. The other attachment bolt was found lodged inside the crankcase next to the #3 cylinder opening. The camshaft exhibited impact damage and was fractured in half at the point where the #2 connecting rod was found positioned. Review of the maintenance records revealed the engine had accumulated 997.75 hours since major overhaul at the time of the last annual inspection. Further review indicated that the last entry in the engine logbook was an oil change, with 1097.4 hours since major overhaul.
Probable Cause: The loss of engine power due to the #2 connecting rod cap separating from the connecting rod. A contributing factor was the limited forward visibility due to oil on the windscreen.
Accident investigation:
 |
|
Sources:
NTSB FTW02LA108
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Oct-2022 18:50 | ASN Update Bot | Added |
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