ASN Wikibase Occurrence # 364147
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| Date: | Monday 16 December 1991 |
| Time: | 17:10 LT |
| Type: | Devenport EAA BIPLANE |
| Owner/operator: | Private |
| Registration: | N9601 |
| MSN: | 1 |
| Total airframe hrs: | 185 hours |
| Engine model: | LYCOMING O-290-D |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Wilksville, OH -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | London, KY (KLOZ) |
| Athens, OH (KUNI) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT WAS IN CRUISE FLIGHT, IN AN EXPERIMENTALLY CERTIFIED AIRPLANE, WHEN THE CRANKCASE BREATHER WHICH WAS NOT PRESSURIZED WITH A WHISTLE SLOT FROZE UP. THE CRANKCASE PRESSURIZED AND THE CRANKCASE SEAL WAS DISLODGED. THE PILOT MADE A PRECAUTIONARY LANDING IN A FIELD OF LIMITED SIZE, SURROUNDED BY TREES. DUE TO THE RESTRICTED VIIBILITY OF THE PILOT, WITH OIL ON HIS GOGGLES AND WINDSHIELD, HE STRUCK A TREE ON FINAL AND MADE AN UNCONTROLLED TOUCHDOWN IN THE FIELD. THE INVESTIGATION REVEALED THERE IS A REQUIREMENT OF A WHISTLE SLOT ON NORMAL, UTILITY, ACROBATIC, AND COMMUTER CATEGORY AIRPLANES, HOWEVER, THIS REQUIREMENT DOES NOT EXIST FOR EXPERIMENTAL CATEGORY AIRPLANES.
Probable Cause: THE RESTRICTED VISIBILITY OF THE PILOT DUE TO OIL ON THE WINDSHIELD AND HIS GOGGLES, WHICH RESULTED IN A TREE STRIKE AND UNCONTROLLED TOUCHDOWN, DURING THE EXECUTION OF A PRECAUTIONARY LANDING. FACTORS RELATED TO THE ACCIDENT WERE A CLOGGED CRANKCASE BREATHER TUBE, THE LACK OF A WHISTLE SLOT ON THE CRANKCASE BREATHER TUBE, AND THE TREES.
Accident investigation:
 |
|
Sources:
NTSB NYC92DEG01
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 19-Mar-2024 12:04 | ASN Update Bot | Added |
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