- Date
- May 12, 2004, 11:45 local (16:45 UTC)
- Place
- Winsted, MN
- Injuries
- 1 minor
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N2301FRobinson R22 Beta
- Weather
- Visual (VMC) · Day
- Status
- Completed · report May 30, 2006
- Report
- Approved by Office Director
- Parties
- FAA
- FAA report
- 20040512011519A
- Case key
- 59257
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
The failure of the main rotor drive belts for an undetermined reason, and the pilot's misjudged flare during the autorotation.
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
The helicopter was damaged during a forced landing. The pilot reported that he heard a loud bang, smelled rubber, received a clutch warning light, and autorotated to a recently planted corn field. The corn was approximately 2 inches tall in rolling terrain. The tail rotor and aft section of the tail boom were separated from the helicopter and the landing skids were bent outward and upward. The main drive system was examined. The main drive belts are composed of 2 independent belts each having twin V's. The 2 belts run in 4 groove pulley sheaves attached to the engine and clutch. One of the belts was split between the 2 V's for approximately 1/2 of the circumference of the belt. The second belt was shredded. Examination of the actuator revealed no anomalies. No other anomalies could be found with respect to the drive system.
Factual narrative
On May 12, 2004, about 1145 central daylight time, a Robinson R22 Beta helicopter, N2301F, piloted by a commercial pilot, sustained substantial damage duirng a forced landing following a failure of the main drive belts near Winsted, Minnesota. The 14 CFR Part 91 personal flight was operating in marginal visual meteorological conditions without a flight plan. The pilot, who was the sole occupant, received minor injuries. The origin of the flight has not been determined.
The pilot initially reported to a Federal Aviation Administration (FAA) Inspector that he heard a loud bang, smelled rubber, received a clutch warning light, and autorotated to a recently planted corn field. The pilot has not submitted a written report of the accident.
The FAA Inspector that responded to the accident site reported that the corn was approximately 2 inches tall in rolling terrain. Pictures of the accident site confirmed the terrain condition. The tail rotor and aft section of the tail boom were separated from the helicopter and the landing skids were bent outward and upward. The main drive system was examined. The main drive belts are composed of 2 independent belts each having twin V's. The 2 belts run in 4 groove pulley sheaves attached to the engine and clutch. One of the belts was split between the 2 V's for approximately 1/2 of the circumference of the belt. The second belt was shredded. Examination of the actuator revealed no anomalies. No other anomalies could be found with respect to the drive system.
Aircraft
- Registration
- N2301F
- Reported as
- Robinson R22 Beta
- Category
- Helicopter
- Serial number
- 1822
- Engine
- Lycoming O-320, 131 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Registered owner
- Gary A. Matthys
- Airworthiness certificate
- Standard, Normal
- Departed
- Unk
- Destination
- Unk
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 36
- Injuries
- Minor
- Certificate
- Commercial
- Airplane ratings
- Single-engine land
- Medical
- Class 1, With waivers/limitations
- Seat
- Right
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 280° at 20 knots, gusting 25
- Visibility
- 10 statute miles
- Lowest ceiling
- 800 ft overcast
- Temperature
- 52 °F, dew point 46 °F
- Altimeter
- 29.70 inHg
- Observed at
- KHCD, 15 nm away
Docket · 2
The files NTSB released with the investigation on March 16, 2006, on NTSB’s docket system: statements, records, photos and specialists’ reports. 160 KB in all.
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.
Other investigations on N2301F · 1
Matched to the same aircraft by N-number and date.