ASN Wikibase Occurrence # 377771
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| Date: | Thursday 31 January 1985 |
| Time: | 12:24 LT |
| Type: |  Piper PA-32RT-300T |
| Owner/operator: | Private |
| Registration: | N2129G |
| MSN: | 32R7987080 |
| Year of manufacture: | 1978 |
| Total airframe hrs: | 602 hours |
| Engine model: | LYCOMING TIO-540 |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Bishop, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Mammoth Lakes, CA |
| Ontario, CA (KONT) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PLT RPTD THAT SHORTLY AFTER LEVELING OFF AT 11500 FT MSL, THE ENGINE EXPLODED CAUSING BOTH WINDSCREENS TO BE COVERED WITH OIL AND FIRE. THE FIRE STOPPED DURING THE EMERGENCY DESCENT. THE ACFT LANDED ON RY 30 AT BISHOP ARPT, BISHOP, CA WITHOUT FURTHER INCIDENT. DISASSEMBLY EXAMINATION OF THE ENGINE REVEALED CRANKSHAFT FAILED AT THE SHORT CHEEK BETWEEN THE NO. 3 MAIN JOURNAL & THE NO. 4 CRANKPIN. THE NOS. 3 & 4 CONNECTING RODS & CAMSHAFT WERE FRACTURED. THE PISTONS SHOWED NO EVIDENCE OF ANY DETONATION. THE BACKSIDE OF THE CON RODS, MAIN JOURNAL BEARINGS & BOTH HALVES OF THE CRANKCASE SHOWED EXTENSIVE FRETTING SIGNATURES INDICATING MISALIGNMENT DURING MANUFACTURE. METALLURGICAL EXAMINATION REVEALED THE CRANKSHAFT FAILED IN FATIGUE. ALL OTHER FRACTURES WERE OVERLOAD SUBSEQUENT TO THE CRANKSHAFT FAILURE. THE ENGINE HAD ACCUMULATED 602 FLT HOURS SINCE NEW.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB LAX85FA130
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 30-Mar-2024 16:13 | ASN Update Bot | Added |
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