Enstrom F-28F accident near Menominee, Michigan, August 29, 2011
On August 29, 2011 at about 6:15 pm local time, a Enstrom F-28F (helicopter), registered N228F, was substantially damaged in an accident during maneuvering (hover) near Menominee, Michigan (Menominee-Marinette Twin City airport). It was a flight test 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
The pilot's failure to maintain control of the helicopter during a hover.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- August 29, 2011 · about 6:15 pm local time
- Place
- Menominee, Michigan · Menominee-Marinette Twin City · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Enstrom F-28F · all F-28Fs on the register
- Registration
- N228F · registry record · serial 819
- Damage
- Substantial damage
- Flight
- Flight test · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
According to the pilot, the purpose of the company test flight was to measure collective stick forces with the collective bias disabled. The pilot, who was the helicopter's only occupant, lifted the helicopter into a hover and then hovered clear of any obstacles. He reported that the collective controls were heavy, as expected, but the helicopter was very controllable. During his attempt to position a force gauge between his hand and the collective grip, the pilot lost control of the helicopter and it landed hard onto the ramp. The helicopter's tail rotor blades impacted the ramp and the helicopter came to rest upright. A postaccident examination of the helicopter showed that the tail rotor blades were bent and the tail rotor driveshaft was sheared. The pilot reported that he should have taken an observer or other personnel on the flight to assist while he concentrated on flying the helicopter.
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 control in flight during maneuvering (hover) defining event
- Collision with terrain or object (not controlled flight into terrain) during maneuvering (hover)
The NTSB's findings
- cause Aircraft › Aircraft oper/perf/capability › Performance/control parameters › (general) › Not attained/maintained
- cause Personnel issues › Task performance › Use of equip/info › Aircraft control › Pilot
Pilot
- Certificate: commercial pilot, private
- Ratings: single-engine land; instrument: airplane; rotorcraft: helicopter
- Flight time: 2,200 hours in all; 152 in this make and model; 31 in the last 90 days; 8 in the last 30 days; 1,970 as pilot in command
- Last flight review: May 5, 2011
- Medical certificate: Class 2 (with waivers/limitations)
- Seat: rgt
- Injury: no injuries
The aircraft
- Airframe total time: 232 hours
- Last inspection: annual inspection, September 29, 2010
- Maximum gross weight: 2,600 lb
- Seats: 3
- Landing gear: fixed
- Engine: Lycoming HIO-360-F1AD (piston); 0 hours total
- Operator: Enstrom Helicopter CORP
The flight
- Departed from: MNM Menominee MI at 6:10 pm
- Destination: MNM Menominee MI
- Flight plan: none
Weather at the time
- Light: daylight
- Wind: from 230° at 5 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 75°F (24°C), dew point 0°F (-18°C)
- Altimeter: 29.89 inHg
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Flight 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.