Bell 206-B accident near Louisville, Kentucky, November 12, 1998
On November 12, 1998 at about 11:15 pm local time, a Bell 206-B (helicopter), registered N32KY, was substantially damaged in an accident near Louisville, Kentucky. It was an aerial observation flight under general aviation rules (Part 91). 1 person had minor injuries; 2 others were unhurt. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
A loose 'B' nut on the aircraft's PC Air line which resulted in fuel starvation, and the pilot's abrupt application of aft cyclic to prevent a nose over. Contributing factors were soft terrain and dark night conditions.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- November 12, 1998 · about 11:15 pm local time
- Place
- Louisville, Kentucky · map
- Type
- Accident
- Injuries
- 1 person had minor injuries; 2 others were unhurt.
- Weather
- visual conditions (good weather)
- Aircraft
- Bell 206-B · all 206-Bs on the register
- Registration
- N32KY · registry record · serial 4039
- Damage
- Substantial damage
- Flight
- Aerial observation flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
The pilot reported that while in cruise at 700 feet AGL the helicopter yawed left, followed by a low rotor caution light being illuminated. The pilot executed an autorotation landing under dark night conditions to a flat, wet, muddy surface. During the landing the helicopter's skids began to dig in, and the helicopter began to nose over. The pilot applied aft cyclic in an effort to prevent the nose over during which the rotor blades impacted and severed the tailboom. Post-crash examination revealed 51 gallons of fuel aboard and no spreading deformation to the helicopter's skids. Further examination revealed that the 'B' nut on the PC air line from the power turbine governor to the fuel control unit was backed off about 2-3 'flats.' The engine was successfully operated in a test cell in an 'as received' condition. During subsequent engine runs, the 'B' nut was tightened and loosened to one flat with no variation in engine performance. The 'B' nut was also completely removed resulting in a stagnant start. According to the manufacturer, a breach in the PC air line will allow air pressure to bleed out and result in the fuel control unit automatically shifting to a minimum flow condition (less than idle). The test cell conditions may or may not have duplicated the vibratory conditions in the aircraft's airframe at the time of the power loss.
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: commercial pilot
- Ratings: single-engine land; instrument: helicopter; rotorcraft: helicopter
- Flight time: 2,414 hours in all; 919 in this make and model; 110 in the last 90 days; 28 in the last 30 days; 1,960 as pilot in command
- Medical certificate: Class 2 (valid medical--no waivers/lim.)
- Seat: rgt
The aircraft
- Airframe total time: 3,169 hours
- Last inspection: 100-hour inspection, September 9, 1998; 69 hours since
- Maximum gross weight: 3,200 lb
- Seats: 5
- Landing gear: fixed
- Engine: Allison 250-C20J (turboshaft); 0 hours total
The flight
- Departed from: 43KY KY at 10:00 pm
- Runway 0
Weather at the time
- Light: night, dark
- Visibility: 7 statute miles
- Sky: broken clouds at 25,000 ft; not recorded
- Temperature: 52°F (11°C), dew point 27°F (-3°C)
- Altimeter: 30.00 inHg
- Observation at 10:48 pm from LOU, 6 miles away
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 | |||
| Passengers | 1 | 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.