Bell 206B accident near Slaton, Texas, October 7, 1999
On October 7, 1999 at about 11:00 pm local time, a Bell 206B (helicopter), registered N21166, was substantially damaged in an accident near Slaton, Texas (Slaton Municipal airport). It was a public-use 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
The pilot's initiation of the simulated emergency procedure at a low altitude.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- October 7, 1999 · about 11:00 pm local time
- Place
- Slaton, Texas · Slaton Municipal · map
- Type
- Accident
- Injuries
- No one was hurt; 2 people were on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Bell 206B · all 206Bs on the register
- Registration
- N21166 · no longer on the register · serial 3447
- Damage
- Substantial damage
- Flight
- Public-use flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
During a 300-foot agl practice 180-degree autorotation, approximately 90 degrees into the turn, the pilot allowed 'a high sink-rate to develop', and began to pull pitch to arrest the descent. The pilot started to 'roll the throttle' open and he observed the N2 and Nr needles join at 92 percent. At this point, the left 180-degree turn was completed, and the aircraft rolled out parallel to and west of the runway with approximately 40 knots indicated airspeed. The pilot continued to roll on throttle and increase the collective in order 'to hold the helicopter about 3 feet above the ground.' However, the 'rotor rpm decreased too low', and the helicopter settled to the ground and slid approximately 60 feet. The left skid toe and lower wire cutter dug into the ground, and the helicopter rocked forward onto the toes of the skids. Subsequently, the main rotor blades contacted and severed the tail boom, and the helicopter rolled over, and came to rest on its left side. The operator stated that 'this maneuver could be entered from a higher agl altitude, this would have prevented the accident.'
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: flight instructor, commercial pilot
- Ratings: single-engine land; instructor: airplane single-engine; instructor: helicopter; instrument: airplane; rotorcraft: helicopter
- Flight time: 3,060 hours in all; 1,368 in this make and model; 167 in the last 90 days; 70 in the last 30 days; 2,724 as pilot in command; 178 on instruments
- Medical certificate: Class 2 (valid medical--w/ waivers/lim.)
- Seat: left
The aircraft
- Airframe total time: 6,651 hours
- Last inspection: annual inspection, September 2, 1999; 51 hours since
- Maximum gross weight: 3,200 lb
- Seats: 5
- Landing gear: fixed
- Engine: Allison 250-C20J (turboshaft); 0 hours total
- Operator: Texas Dept. Of Public Safety
The flight
- Departed from: LBB Lubbock TX at 9:20 pm
- Flight plan: none
- Runway 18, 3,800 ft by 60 ft
- A second pilot was aboard
Weather at the time
- Light: daylight
- Wind: from 150° at 10 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 81°F (27°C), dew point 52°F (11°C)
- Altimeter: 29.00 inHg
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| 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.