Rockwell 690B accident near Konawa, Oklahoma, June 25, 1992
On June 25, 1992 at about 1:33 pm local time, a Rockwell 690B, registered N690JC, was destroyed in an accident near Konawa, Oklahoma. It was a ferry flight under general aviation rules (Part 91). 1 person was killed. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
THE PILOT'S FAILURE TO MAINTAIN CONTROL OF THE AIRPLANE WHICH RESULTED IN AN INADVERTENT SPIRAL AND SUBSEQUENT RAPID DESCENT. THE DESIGN STRESS LIMITS OF THE AIRFRAME WERE EXCEEDED RESULTING IN AN OVERLOAD FAILURE OF THE EMPENNAGE. FACTORS RELATED TO THE ACCIDENT WERE: TURBULENCE AND THE PILOT'S PHYSICAL IMPAIRMENT DUE TO DRUGS.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- June 25, 1992 · about 1:33 pm local time
- Place
- Konawa, Oklahoma · map
- Type
- Accident
- Injuries
- 1 person was killed.
- Weather
- visual conditions (good weather)
- Aircraft
- Rockwell 690B
- Registration
- N690JC · no longer on the register · serial 11479
- Damage
- Destroyed
- Flight
- Ferry flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
AS THE AIRPLANE WAS DEVIATING AROUND LOW INTENSITY WEATHER RETURNS, AND PASSING THROUGH 20,500 FT DURING CLIMB OUT, IT DEPARTED CONTROLLED FLIGHT AND ENTERED A RIGHT SPIRAL. DESCENT RATES EXCEEDED 16,600 FPM DURING THE DESCENT FROM 18,300 FT TO 3,900 FT AND THEN SLOWED. WITNESSES STATED THEY SAW THE AIRPLANE DESCEND FROM THE CLOUDS IN A RIGHT FLAP SPIN. THE EMPENNAGE HAD SEPARATED FROM THE AIRPLANE IN PIECES. PIECES OF THE WRECKAGE WERE FOUND UP TO 1.5 MI FROM THE PRIMARY IMPACT POINT. BOTH WINGS REMAINED ATTACHED. THE RIGHT ENGINE WAS FLAMED OUT, AND THE PROP WAS FEATHERED AT IMPACT. NO MECHANICAL REASON FOR THE FLAMEOUT COULD BE DETERMINED. AT NO TIME DID THE PILOT INDICATE HE WAS HAVING DIFFICULTIES. THE NTSB WEATHER STUDY INDICATED THAT MODERATE TURBULENCE WAS PRESENT IN THE AREA. THE PILOT'S TOXICOLOGY TESTS FOUND 0.151 UG/ML OF CHLORPHENIRAMINE IN THE BLOOD; NORMAL THERAPEUTIC CONCENTRATION IS 0.01 TO 0.04. EFFECTS OF OVERDOSAGE INCLUDE SEDATION, DIMINISHED MENTAL ALERTNESS, AND CARDIOVASCULAR COLLAPSE TO STIMULATION.
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: airline transport pilot, flight instructor, commercial pilot, military
- Ratings: multi-engine land; single-engine land; instructor: airplane multi-engine; instructor: airplane single-engine; instructor: helicopter; instructor: instrument airplane; instructor: instrument helicopter; instrument: airplane; instrument: helicopter; rotorcraft: helicopter
- Flight time: 8,857 hours in all; 98 in this make and model; 77 in the last 90 days; 15 in the last 30 days; 8,486 as pilot in command; 3,065 on instruments
- Medical certificate: Class 2 (valid medical--w/ waivers/lim.)
- Seat: left
The aircraft
- Airframe total time: 3,355 hours
- Last inspection: 100-hour inspection, March 27, 1992; 28 hours since
- Maximum gross weight: 10,250 lb
- Seats: 11
- Landing gear: retractable
- Engine: Garrett TPE-331-5-251 (turboprop); 0 hours total
- Fire on the ground
- Operator: Aircraft Sales International
The flight
- Departed from: OUN Norman OK at 1:13 pm
- Destination: FLL Ft. Lauderdale FL
- Flight plan: IFR
- Runway 0
Weather at the time
- Light: daylight
- Wind: from 120° at 8 knots
- Sky: broken clouds at 3,400 ft; scat at 2,000 ft
- Temperature: 70°F (21°C), dew point 0°F (-18°C)
- Altimeter: 29.00 inHg
- Observation at 1:52 pm from ADM, 35 miles away
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.