On September 3, 1982, a Piper PA-28R (registration N4976S) operated by Bruce Crouse was involved in an aviation accident near Sewanee, TN. Investigators recorded the probable cause as: The propeller seized due to oil starvation; post-examination revealed a crack in the propeller governor oil line and that the support brackets were not attached, allowing the line to vibrate and flex. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
During en route flight, oil pressure dropped to zero, leading to propeller seizure from oil starvation. Examination revealed a cracked propeller governor oil line and missing support brackets.
Incident Overview
During a routine en route flight, the oil pressure gauge indicated zero pressure. Shortly thereafter, the propeller seized as a result of oil starvation. The event prompted a post-accident examination of the engine.
Examination Findings
A post-accident examination of the propeller governor oil line (part number 76157) identified a crack at a bend located approximately 1 inch from the "B" nut that attached the line to the elbow fitting at the forward end of the engine. The line was made of stainless steel. Additionally, it was found that two support brackets, as illustrated in the parts manual, were not attached to the line. The absence of these brackets allowed the line to vibrate and flex during operation.
Engine History
Records indicate that the engine had undergone an overhaul 75 hours prior to the accident.
Probable cause
The propeller seized due to oil starvation; post-examination revealed a crack in the propeller governor oil line and that the support brackets were not attached, allowing the line to vibrate and flex.
Frequently asked questions
What happened in the 3 Sept 1982 Piper PA-28R accident near Sewanee, TN?
During en route flight, oil pressure dropped to zero, leading to propeller seizure from oil starvation. Examination revealed a cracked propeller governor oil line and missing support brackets.
What aircraft was involved and where did it happen?
The accident on 3 Sept 1982 involved a Piper PA-28R, registration N4976S, operated by Bruce Crouse, at Sewanee, TN.
What was the probable cause of the accident?
The propeller seized due to oil starvation; post-examination revealed a crack in the propeller governor oil line and that the support brackets were not attached, allowing the line to vibrate and flex.
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