Probable cause
The partial loss of engine power due to the failure of the magneto's internal timing during low-altitude maneuvering.
NTSB analysis
The helicopter experienced a loss in rotor rpm while maneuvering during a low-level wildlife survey. The commercial pilot then performed a forced landing to a field.
Postaccident examination of the helicopter revealed that one of the engine magnetos had an internal timing, efficiency gap failure, which would have resulted in improper engine ignition timing and loss of engine power/rpm. Examination also revealed that the magneto distributer gear was loose and that the distributer gear bushing was flapping around.
Text from the NTSB. Open the NTSB docket for CEN17LA099 for the full record.
Event
- Date
- Oct 28, 2016
- Type
- Accident
- Place
- Asherton, Texas
- Highest injury
- None
- Weather
- Visual (VMC)
- Light
- Day
Robinson R22 BETA
- N-number
- N522KC
- Category
- Helicopter
- Year built
- 2005
- Damage
- Substantial
- Operating rule
- Part 91 (general aviation)
- Purpose of flight
- Aerial observation
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.