NTSB Identification: FTW00LA132.
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Accident occurred Wednesday, April 26, 2000 in HUNTER, OK
Probable Cause Approval Date: 07/17/2001
Aircraft: Cessna 140, registration: N76176
Injuries: 1 Uninjured.
NTSB investigators may have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
While en route, following a decrease of oil pressure, the pilot shut down the engine. During the forced landing flare/touchdown in the field, the main landing gear struck a fence and the airplane nosed over. At the site, oil was found covering the lower surface of the airplane from the engine cowling to the empennage, and the oil cap was not found. The engine and aircraft manufacturers did not have any record where a secured oil cap came off in flight. The aircraft representative stated that if the 'tabs inside the filler cap became corroded completely through, they would not retain the cap properly.' A mechanic, who recovered the airplane from the field, stated that the oil cap was not found, and he noticed no discrepancies or rust on the oil filler neck. The manufacturer's preflight checklist states in part: 'Check oil level.' The operating details states in part: 'In replacing the cap, make sure that it is on firmly and turned all the way to the stop at the right to prevent loss of oil through the filler neck.'
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The pilot's inadequate preflight resulting in the loss of the oil cap and subsequent loss of engine oil. A factor was the lack of suitable terrain for the landing. Full narrative available
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