Probable cause
A total loss of engine power due to pre-ignition/detonation as a result of a fuel control malfunction.
NTSB analysis
During an aerial application flight, the pilot noticed the engine oil temperature rise and the oil pressure decrease. The oil pressure went to zero and the engine lost all power. The pilot initiated a forced landing into a soybean field. Examination of the engine found an abnormal fuel flow through the return fitting at full rich mixture setting and a leak at the mixture shaft. Additionally, the Nos. 1 and 4 piston heads exhibited thermal erosion consistent with a pre-ignition/detonation event. This type of piston damage would elevate crankcase pressure and allow oil loss through the crankcase breather system, decreasing oil pressure and increasing oil temperature.
Text from the NTSB. Open the NTSB docket for ERA09LA470 for the full record.
Event
- Date
- Aug 20, 2009
- Type
- Accident
- Place
- Mcrae, Georgia
- Highest injury
- None
- Weather
- Visual (VMC)
- Light
- Day
Cessna A188B
- N-number
- N4842R
- Category
- Airplane
- Damage
- Substantial
- Operating rule
- Part 137 (agricultural)
- Purpose of flight
- Aerial application
From the NTSB aviation accident database: N-registered aircraft, events since 2008, data through Oct 28, 2026. The file is published monthly, so the latest weeks are incomplete and recent records can change. The official source is the NTSB aviation investigation search. CheckAero is independent and not affiliated with the NTSB.