ASN Wikibase Occurrence # 131861
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| Date: | Wednesday 28 July 1999 |
| Time: | 06:50 LT |
| Type: |  Rockwell S-2R Thrush Commander |
| Owner/operator: | Gary Flying Service, Inc. |
| Registration: | N8482V |
| MSN: | 2242R |
| Total airframe hrs: | 4579 hours |
| Engine model: | P&W R-1340-AN1 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Isola, MS -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | Belzoni, MS |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While performing aerial application the pilot stated the engine backfired twice, lost oil pressure, backfired again, and then shutdown. While making a forced landing, the aircraft collided with a ditch and a post crash fired erupted. Postcrash examination of the engine under FAA supervision showed the No. 4 cylinder had compression of 35 over 80 psi and was leaking through the intake valve. Also, 7 of 18 valves were not adjusted within manufacturer's limits and all spark plug gaps were above manufacturer's limits.
Probable Cause: Failure of the No. 4 cylinder due to a leaking intake valve resulting in loss of engine power and collision with a ditch while making a forced landing on unsuitable terrain. Contributing to the accident was improper maintenance adjustment of the engine valves and spark plugs.
Accident investigation:
 |
|
Sources:
NTSB MIA99LA204
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 14-Dec-2017 08:43 | ASN Update Bot | Updated [Departure airport, Source, Narrative] |
| 07-Apr-2024 19:04 | ASN Update Bot | Updated [Time, Other fatalities, Source, Narrative, Category, Accident report] |
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