Rockwell 690B N690JC

Summary

On 25 June 1992 at about 13:33 local time, a Rockwell 690B registered N690JC, operated by Aircraft Sales International, was involved in an accident near Konawa, Oklahoma, United States. One person was on board and one died. The aircraft was destroyed. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

25 June 1992 at 13:33

Classification

Accident

Location

Konawa, Oklahoma, United States

Coordinates

34.9503, -96.7494

Aircraft

Rockwell 690B

Registration

N690JC

Category

Airplane

Engines

2

Operator

Aircraft Sales International

Operating rule

Part 91: General Aviation

Purpose of flight

Ferry

Phase of flight

Not recorded

Route

Norman → Ft. Lauderdale

Aircraft damage

Destroyed

Weather

VMC

Light

Day

NTSB number

FTW92FA169

1 person died.

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.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

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.

Quoted verbatim from the NTSB record.