Probable cause
The pilot’s loss of directional control on takeoff for undetermined reasons.
NTSB analysis
The pilot reported that on takeoff roll, he felt the left brake lock up, which pulled the airplane hard to the left off the runway. The airplane came to rest inverted. All four wing panels and the empennage were substantially damaged. A postaccident examination of the brake system revealed no mechanical anomalies that would have precluded normal operation. The reason for the pilot's loss of directional control of the airplane on takeoff roll was not able to be determined during the investigation.
Text from the NTSB. Open the NTSB docket for WPR20LA175 for the full record.
Event
- Date
- Jun 4, 2020
- Type
- Accident
- Place
- Lincoln, California
- Highest injury
- Minor
- Minor injuries
- 1
- Weather
- Visual (VMC)
- Light
- Day
Grumman G164
- N-number
- N8486K
- Category
- Airplane
- Year built
- 1982
- 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.