On August 18, 1995, a Beech P-35 (registration N9531Y) was involved in an aviation accident near Bend, OR. Investigators recorded the probable cause as: seizure of the #4 connecting rod bearing due to overtemperature resulting in the separation of the connecting rod and total loss of engine power. A factor contributing to the accident was the lack of suitable terrain for a forced landing. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
During cruise flight, a pilot experienced a total loss of engine power after noticing oil pressure loss. Ditching in a lake followed. Examination found the #4 connecting rod separated from the crankshaft.
Incident Details
While in cruise flight, the pilot observed a loss of oil pressure, which was immediately followed by a complete loss of engine power. With no other suitable forced landing site available, the pilot elected to ditch the airplane in a lake. The aircraft came to rest in the water.
Engine Examination
A post-accident examination of the engine was conducted. The investigation revealed that the #4 connecting rod had separated from the crankshaft at the end cap. The rod end cap bolts had separated from the cap and exhibited evidence of necking and heat distress. The #4 rod journal also showed signs of heat distress. The bearings associated with the #4 rod journal were destroyed. In contrast, all other rod journals and all main bearing journals did not exhibit evidence of heat distress or lack of lubrication.
What happened in the 18 Aug 1995 Beech P-35 accident near Bend, OR?
During cruise flight, a pilot experienced a total loss of engine power after noticing oil pressure loss. Ditching in a lake followed. Examination found the #4 connecting rod separated from the crankshaft.
What aircraft was involved and where did it happen?
The accident on 18 Aug 1995 involved a Beech P-35, registration N9531Y, at Bend, OR.
What was the probable cause of the accident?
seizure of the #4 connecting rod bearing due to overtemperature resulting in the separation of the connecting rod and total loss of engine power. A factor contributing to the accident was the lack of suitable terrain for a forced landing.
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