Probable cause
A partial loss of engine power for reasons that could not be determined because a postaccident examination revealed no evidence of preimpact mechanical malfunctions or failures that would have precluded normal operation.
NTSB analysis
During the agricultural application flight, the commercial pilot noticed a loss of engine speed (rpm) after completing an application pass. He subsequently observed a decrease in engine oil pressure combined with an increase in oil temperature. As he returned for a forced landing to the corn field being sprayed, the oil pressure was about 7 psi. The pilot indicated that the engine was "coughing" at that point, and he decided to shut the engine down; the loss of engine power was not catastrophic. He subsequently landed in the field, and the airplane sustained substantial damage to the right wing.
A postaccident examination revealed no evidence of preimpact mechanical malfunctions or failures that would have precluded normal operation. Thus, the reason for the partial loss of engine power could not be determined.
Text from the NTSB. Open the NTSB docket for CEN18LA311 for the full record.
Event
- Date
- Aug 2, 2018
- Type
- Accident
- Place
- Watkins, Minnesota
- Nearest airport
- Litchfield Muni (LJF)
- Highest injury
- None
- Weather
- Visual (VMC)
- Light
- Day
Cessna 188
- N-number
- N5523S
- Category
- Airplane
- Year built
- 1966
- 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.