ASN Wikibase Occurrence # 289177
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| Date: | Sunday 26 June 2011 |
| Time: | 09:15 LT |
| Type: |  Pitts S-1T |
| Owner/operator: | |
| Registration: | N77MN |
| MSN: | 1040 |
| Total airframe hrs: | 1919 hours |
| Engine model: | Lycoming AEIO-360-A1E |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Alkali Lake, Oregon -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Burns, OR |
| Lakeview, OR | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that, during cruise flight, a large amount of oil suddenly covered the windscreen, causing her to initiate a precautionary off-airport landing as the oil pressure dropped to zero. Because of the uneven terrain in area in which she was flying, suitable landing sites were minimal. During the landing, the pilot attempted to pitch the tail-wheel airplane upward in order to drag the tail along the ground to slow the airspeed. The pilot stated that she had no response from the elevator or ailerons. The airplane impacted the uneven terrain in a nose-low attitude and cartwheeled, resulting in structural damage to all four wings and the fuselage. Examination of the recovered engine revealed that the front bearing oil seal was partially extruded from the crankcase nose seal bore. No additional mechanical anomalies were noted during the examination of the engine or airframe. The reason for the front bearing oil seal becoming extruded from the crankcase bore area was undetermined.
Probable Cause: The loss of engine oil during cruise flight due to the failure of the front bearing oil seal.
Accident investigation:
 |
|
Sources:
NTSB WPR11LA290
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 05-Oct-2022 10:41 | ASN Update Bot | Added |
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