Probable cause
A loss of engine power while in cruise flight for undetermined reasons.
NTSB analysis
The certified flight instructor (CFI) and student pilot were on a local instructional flight. The CFI stated that during cruise flight, the rpm dropped suddenly and he lowered the collective while rolling on the throttle. The engine did not respond and the helicopter impacted the ground. The CFI indicated that carburetor heat had been applied shortly before the power loss occurred. Post accident test run of the engine did not reveal any operational anomalies. At the time of the accident, the Federal Aviation Administration icing probability chart showed that icing conditions existed at glide and cruise power.
Text from the NTSB. Open the NTSB docket for WPR09LA314 for the full record.
Event
- Date
- Jun 26, 2009
- Type
- Accident
- Place
- Lewiston, Idaho
- Highest injury
- None
- Weather
- Visual (VMC)
- Light
- Day
Robinson Helicopter R22 BETA
- N-number
- N836SH
- Category
- Helicopter
- Damage
- Substantial
- Operating rule
- Part 91 (general aviation)
- Purpose of flight
- Instructional
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.