ASN Wikibase Occurrence # 358668
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| Date: | Wednesday 12 July 1995 |
| Time: | 19:00 LT |
| Type: |  Cessna 172P |
| Owner/operator: | Wings Aloft |
| Registration: | N52139 |
| MSN: | 17274421 |
| Year of manufacture: | 1980 |
| Total airframe hrs: | 5173 hours |
| Engine model: | LYCOMING O-320-D2J |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Vashon, WA -
 United States of America
|
| Phase: | En route |
| Nature: | Training |
| Departure airport: | Seattle, WA (KBFI) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
WHILE IN CRUISE FLIGHT, THE ENGINE SUDDENLY MADE A LOUD SOUND, BEGAN TO SHAKE, THEN LOST POWER. THE PILOT INITIATED A FORCED LANDING TO AN OPEN FIELD. THE AIRPLANE TOUCHED DOWN, BOUNCED AND BECAME AIRBORNE BEFORE TOUCHING DOWN THE SECOND TIME. THE NOSE GEAR COLLAPSED AND THE AIRPLANE SLID TO A STOP. POST CRASH EXAMINATION REVEALED HOLES IN THE CRANKCASE. A TEARDOWN OF THE ENGINE FOUND THAT THE NUMBER THREE AND FOUR CONNECTING ROD CAP BOLTS SEPARATED. A METALLURGICAL EXAMINATION OF THE FRACTURED BOLTS REVEALED FEATURES CHARACTERISTIC OF A PROGRESSIVE OVERSTRESS. THE METALLURGICAL SPECIALIST REPORTED THAT THE SEPARATION MOST LIKELY OCCURRED DUE TO AN INADEQUATELY TORQUED NUT OR LOSS OF PRESTRESS OVER A PERIOD OF TIME.
Probable Cause: THE LOSS OF ENGINE POWER DUE TO CONNECTING ROD BOLT OVERLOAD FAILURE. THE ROUGH, UNEVEN TERRAIN IN THE EMERGENCY LANDING AREA WAS A FACTOR.
Accident investigation:
 |
|
Sources:
NTSB SEA95LA155
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Mar-2024 16:53 | ASN Update Bot | Added |
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