ASN Wikibase Occurrence # 37348
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| Date: | Thursday 25 June 1992 |
| Time: | 09:33 LT |
| Type: |  Rockwell Aero Commander 690B |
| Owner/operator: | Aircraft Sales International |
| Registration: | N690JC |
| MSN: | 11479 |
| Year of manufacture: | 1978 |
| Total airframe hrs: | 3355 hours |
| Engine model: | GARRETT TPE-331-5-251 |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Konawa, OK -
 United States of America
|
| Phase: | En route |
| Nature: | Ferry/positioning |
| Departure airport: | Norman, OK (KOUN) |
| Ft. Lauderdale, FL (FLL | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
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.
Probable Cause: 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.
Accident investigation:
 |
|
Sources:
NTSB FTW92FA169
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 11-Feb-2012 11:43 | Gwydd | Updated [Aircraft type, Source] |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 11-Apr-2024 06:20 | ASN Update Bot | Updated [Time, Other fatalities, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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