ASN Wikibase Occurrence # 363150
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| Date: | Sunday 9 August 1992 |
| Time: | 12:30 LT |
| Type: |  Weatherly 620A |
| Owner/operator: | Varner Bass Aviation, Inc |
| Registration: | N4650W |
| MSN: | 1539 |
| Total airframe hrs: | 300 hours |
| Engine model: | P&W R-985 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Cobb, GA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | Leesburg, GA (NONE) |
| (NONE) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
WHILE CONDUCTING AN AERIAL APPLICATION FLIGHT, THE ENGINE SEIZED & A FORCED LANDING WAS MADE INTO A CORN FIELD. THE AIRPLANE NOSED OVER DURING THE LANDING ROLL. EXAMINATION OF THE AIRPLANE REVEALED THAT ENGINE OIL COVERED ITS BELLY. THE CHIP DETECTOR IN THE OIL SUMP OF THE ENGINE WAS FOUND BROKEN, WITH THE DETECTOR ELECTRODE HELD ON BY ITS TRANSMISSION WIRE. THE OPEN DETECTOR PORT HAD ALLOWED ALL OF THE ENGINE OIL TO ESCAPE. METALLURGICAL EXAMINATION OF THE DETECTOR ELECTRODE REVEALED THAT IT HAD SEPARATED BECAUSE OF CORROSION. THE OPERATOR'S MECHANIC STATED THAT HE USUALLY FOUND ABOUT ONE TABLESPOON OF WATER IN THE ENGINE SUMP DURING 100 HOUR OIL CHANGES.
Probable Cause: THE CORRODED, AND SEPARATED, MAGNETIC CHIP DETECTOR PLUG WHICH ALLOWED THE LOSS OF ALL ENGINE OIL AND THE ENGINE'S SUBSEQUENT SEIZURE. FACTORS WERE THE INADEQUATE 100 HOUR INSPECTION, AND THE HIGH VEGETATION IN THE FORCED LANDING FIELD.
Accident investigation:
 |
|
Sources:
NTSB ATL92LA154
History of this aircraft
Other occurrences involving this aircraft
| 23 May 2003 | N4650W | Foss | 0 | Melville, North Dakota | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 18-Mar-2024 14:07 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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