Robinson Helicopter R22 BETA accident near Lewiston, Idaho, June 26, 2009
On June 26, 2009 at about 1:15 am local time, a Robinson Helicopter R22 BETA, registered N836SH, was substantially damaged in an accident during enroute (cruise) near Lewiston, Idaho. It was an instructional flight under general aviation rules (Part 91). No one was hurt; 2 people were on board or involved. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
A loss of engine power while in cruise flight for undetermined reasons.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- June 26, 2009 · about 1:15 am local time
- Place
- Lewiston, Idaho · map
- Type
- Accident
- Injuries
- No one was hurt; 2 people were on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Robinson Helicopter R22 BETA · all R22 BETAs on the register
- Registration
- N836SH · no longer on the register · serial 3806
- Damage
- Substantial damage
- Flight
- Instructional flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
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.
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The factual record from the NTSB's investigation tables, in plain English
What happened, in order
- Loss of engine power (total) during enroute (cruise) defining event
The NTSB's findings
- cause Not determined › Not determined › (general) › (general) › Unknown/Not determined
- Environmental issues › Conditions/weather/phenomena › Temp/humidity/pressure › Conducive to carburetor icing › Not specified
Flight instructor
- Certificate: flight instructor, commercial pilot
- Ratings: instructor: helicopter; instrument: helicopter; rotorcraft: helicopter
- Flight time: 263 hours in all; 181 in this make and model; 23 in the last 90 days; 23 in the last 30 days; 165 as pilot in command; 23 on instruments
- Last flight review: October 1, 2008
- Medical certificate: Class 2 (without waivers/limitations)
- Seat: left
- Injury: no injuries
Dual student
No details recorded.
Dual student
- Flight time: 0 hours in all
- Medical certificate: None
- Seat: rgt
- Injury: no injuries
The aircraft
- Airframe total time: 3,088 hours
- Last inspection: 100-hour inspection, April 18, 2009; 70 hours since
- Maximum gross weight: 1,370 lb
- Seats: 2
- Landing gear: fixed
- Engine: Lycoming O-360 SERIES (piston); 0 hours total
- Operator: Lewis And Clark Aviation LLC
The flight
- Departed from: Lewiston ID at 6:25 pm
- Destination: Lewiston ID
- Flight plan: none
Weather at the time
- Light: daylight
- Wind: from 310° at 9 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 77°F (25°C), dew point 41°F (5°C)
- Altimeter: 29.96 inHg
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Flight crew | 2 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
The docket, the folder of records gathered during an investigation (maintenance records, photographs, witness statements, examinations), has not been read from the NTSB for this case yet; the list appears here once it has. Open the docket at the NTSB.
Everything on this page comes from the NTSB's public records. The narrative, probable cause and findings are the NTSB's own words; the coded tables behind the report are written out in plain English, with pilots' ages, home towns and medical details left out. The documents and photographs are the NTSB's docket, shown as the NTSB released them. This site's own text never names anyone involved. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.