Probable cause
A loss of engine power while maneuvering for undetermined reasons.
NTSB analysis
The certified flight instructor (CFI) and pilot undergoing instruction (PUI) were on a local instructional flight. The helicopter was fueled about 15 minutes prior and they were initiating a 180-degree autorotation with a power recovery. The helicopter entered into a glide and they made the turn onto the final segment. The CFI noticed that the oil and auxiliary fuel pump lights were on. The CFI then looked at the tachometer and attempted to increase the throttle. The power did not return and the CFI force-landed the helicopter. During the landing the main rotor blade impacted the tail boom. Post accident examination of the helicopter and test run of the engine revealed no operational anomalies.
Text from the NTSB. Open the NTSB docket for WPR09LA312 for the full record.
Event
- Date
- Jun 25, 2009
- Type
- Accident
- Place
- Lakeport, California
- Highest injury
- None
- Weather
- Visual (VMC)
- Light
- Day
Robinson Helicopter Company R44 II
- N-number
- N515DG
- 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.