On June 16, 1992, a Piper PA-24-180 (registration N21RE) operated by Hugh J. Harmon was involved in an aviation accident near Felton, PA. Investigators recorded the probable cause as: The pilot's failure to maintain oil pressure, which resulted from a disconnected oil return line due to improper installation by the mechanic. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A pilot made a precautionary landing in a wheat field after noticing a loss of oil pressure following the installation of a propeller governor oil line.
What happened
Following the installation of a propeller governor oil line, the flight crew noticed a loss of oil pressure. The pilot elected to make a precautionary landing in a nearby wheat field.
The investigation
Post-accident examination revealed that the oil return line from the number three cylinder was disconnected. The mechanic who performed the work stated he operated as a one-man shop and that difficulties caused the job to take 3 hours instead of the projected 1 1/2 hours. He also admitted allowing customer pressure to override his standards.
Findings
The primary factor was the disconnected oil return line. Contributing factors included the mechanic's decision to allow customer pressure to override standards and the extended duration of the repair work.
Probable cause
The pilot's failure to maintain oil pressure, which resulted from a disconnected oil return line due to improper installation by the mechanic.
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