Amateur-built Revolution Mini 500 accident near Sterling, Massachusetts, June 8, 2002
On June 8, 2002 at about 8:00 pm local time, a amateur-built Revolution Mini 500 (helicopter), registered N54VP, was destroyed in an accident near Sterling, Massachusetts (Sterling Airport). It was a personal flight under general aviation rules (Part 91). No one was hurt; 1 person was on board or involved. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
A misalignment of the rotor system drive belt, which resulted in belt chaffing, its subsequent separation, and a resultant loss of power to the rotor system. Also causal was the relatively low altitude and airspeed at which the separation occurred, which inhibited the pilot's inability to maintain a level attitude during the autorotation.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- June 8, 2002 · about 8:00 pm local time
- Place
- Sterling, Massachusetts · Sterling Airport · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Amateur-built Revolution Mini 500
- Registration
- N54VP · no longer on the register · serial 0054
- Damage
- Destroyed
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
The pilot hover-taxied the helicopter from its tiedown spot to a grassy area for takeoff. Upon reaching the grassy area, he initiated a takeoff, and the helicopter accelerated through effective translational lift and began to climb. About 30 feet and 25 mph, the rotor system drive belt broke. The helicopter yawed to the left, and the pilot immediately lowered the collective and applied right rudder to correct the yaw. The helicopter impacted the ground "straight ahead but tail down." The main rotor deflected downward, and a rotor blade stuck the tail boom. The helicopter's right skid collapsed, and the helicopter rolled over on its right side and caught on fire. A section of drive belt, about 46 inches in length, had "broomstraw" separations at both ends. On the toothed side of the belt, there were about 15 areas along one edge that were worn down or missing. Another section of belt, about 40 inches in length, also had broomstaw separations at both ends, although one end had considerably less. The belt was missing material its entire length, with the missing material varying between 1/2 to 3/4 the width of the belt.
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
Pilot
- Certificate: private
- Ratings: rotorcraft: glider; rotorcraft: helicopter
- Flight time: 4,500 hours in all; 212 in this make and model; 20 in the last 90 days; 3 in the last 30 days
- Last flight review: July 9, 2000
- Medical certificate: Class 3 (valid medical--w/ waivers/lim.)
- Seat: sngl
- Injury: minor injuries
The aircraft
- Airframe total time: 212.2 hours
- Last inspection: continuous airworthiness programme, May 31, 2002; 1.4 hours since
- Seats: 1
- Landing gear: fixed
- Engine: Rotax 582 (piston); 0 hours total
- Fire on the ground
The flight
- Departed from: 3B3 Sterling MA at 6:00 pm
- Flight plan: none
Weather at the time
- Light: daylight
- Wind: from 200° at 8 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 66°F (19°C), dew point 0°F (-18°C)
- Altimeter: 30.26 inHg
- Observation at 7:45 pm from ORH
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 |
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.