ASN Wikibase Occurrence # 59724
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| Date: | Monday 27 April 2009 |
| Time: | 10:45 |
| Type: |  Cessna 172M |
| Owner/operator: | LH Underwood Aerial Patrol, Inc |
| Registration: | N9884Q |
| MSN: | 17265828 |
| Year of manufacture: | 1975 |
| Total airframe hrs: | 10024 hours |
| Engine model: | Lycoming O320 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Elmo McFarland Road, Chesterfield, South Carolina -
 United States of America
|
| Phase: | En route |
| Nature: | Survey |
| Departure airport: | Spartanburg, SC (SPA) |
| Thomaston, GA (OPN) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot stated that while flying pipeline patrol about 500 feet above ground level, the engine began to run “rough” and lose engine rpm with a corresponding loss of power. The pilot adjusted the carburetor heat, throttle, and mixture controls to the “full” positions, as well as adjusting the fuel selector to all positions, with no change in engine performance. He navigated toward the nearest airport and noted that the engine rpm had decayed to 1900 as the airplane descended. The pilot determined that he could not reach the airport and made an emergency landing in trees. Postaccident, the airplane engine started and ran but did not develop full power. Disassembly of the engine revealed excessive wear and a broken exhaust valve. The engine manufacturer recommended overhaul at 2,000 engine hours, or 12 calendar years, whichever occurred first. Examination of aircraft logbooks revealed that the engine had accrued 2,403 hours and nearly 13 years since its last overhaul.
Probable Cause: The partial loss of engine power due to a broken exhaust valve. Contributing to the accident was the operator's exceedance of the engine manufacturer's recommended time before overhaul.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 29-Apr-2009 21:59 | slowkid | Added |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 01-Dec-2017 18:53 | ASN Update Bot | Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
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