On May 13, 1995, a Piper PA-28-140 (registration N9672W) was involved in an aviation accident near Dubois, PA. Investigators recorded the probable cause as: The total loss of engine power due to fatigue failure of the number two cylinder intake valve springs, which were corroded and pitted. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A light aircraft lost engine power at 1,000 feet during takeoff, forcing a landing in a field where it nosed over. Investigation found fractured intake valve springs with corrosion.
What happened
The pilot reported that during the initial climb phase after takeoff, the airplane's engine experienced a total loss of power at an altitude of approximately 1,000 feet above ground level. Unable to maintain flight, the pilot executed a forced landing in a soft field. Upon impact, the aircraft nosed over.
The investigation
A postaccident examination of the engine revealed that the two intake valve springs in the number two cylinder had failed. Examination of the fracture surfaces indicated they were corroded and pitted. The engine had accumulated only 13.7 hours since receiving a major overhaul.
Findings
The failure was attributed to fatigue initiated by corrosion on the valve spring surfaces.
Probable cause
The total loss of engine power due to fatigue failure of the number two cylinder intake valve springs, which were corroded and pitted.
What happened in the 13 May 1995 Piper PA-28-140 accident near Dubois, PA?
A light aircraft lost engine power at 1,000 feet during takeoff, forcing a landing in a field where it nosed over. Investigation found fractured intake valve springs with corrosion.
What aircraft was involved and where did it happen?
The accident on 13 May 1995 involved a Piper PA-28-140, registration N9672W, at Dubois, PA.
What was the probable cause of the accident?
The total loss of engine power due to fatigue failure of the number two cylinder intake valve springs, which were corroded and pitted.
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