ASN Wikibase Occurrence # 357004
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| Date: | Sunday 21 July 1996 |
| Time: | 14:30 LT |
| Type: |  Cessna 172XP |
| Owner/operator: | Private |
| Registration: | N736LB |
| MSN: | R1722602 |
| Year of manufacture: | 1977 |
| Total airframe hrs: | 2082 hours |
| Engine model: | Continental IO-360-KB |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Kenai, AK -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | King Salmon, AK (AKN |
| Anchorage, AK (MRI) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was exiting a mountain pass when the airplane's engine suddenly lost all power. His attempts at restarting the engine were unsuccessful, and he made an emergency landing on a rough gravel bar. During the engine examination, the #2 cylinder piston connecting rod was found fractured and separated from the crankshaft. The #2 piston connecting rod cap and cap bolts were also fractured and separated from the crankshaft. The #2 piston connecting rod journal was rough and abraded. The piston connecting rod cap bolts had fractured about mid span, and the fracture ends were stretched and necked down. The castellated nuts used to secure the rod cap were found still attached to their respective rod cap bolts. No other mechanical anomalies were discovered during the engine examination. The mechanic who recovered the airplane from the accident site indicated that he drained at least 6 quarts of oil from the engine prior to the recovery.
Probable Cause: The loss of engine power due to seized piston connecting rod bearings, and subsequent failure of the piston connecting rod cap and fracture of the piston connecting rod. A factor associated with the accident was the rough and uneven emergency landing site.
Accident investigation:
 |
|
Sources:
NTSB ANC96LA103
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Mar-2024 13:12 | ASN Update Bot | Added |
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