Last updated: 21 February 2020
| Status: | Final |
| Date: | Friday 4 April 1986 |
| Time: | 19:22 |
| Type: |  IAI 1124A Westwind II |
| Operating for: | Integerresources Inc. & Drayton Ass. |
| Leased from: | Drayton Associates |
| Registration: | N50SK |
| C/n / msn: | 309 |
| First flight: | 1980 |
| Total airframe hrs: | 2745 |
| Engines: | 2 Garrett TFE731-3-1G |
| Crew: | Fatalities: 2 / Occupants: 2 |
| Passengers: | Fatalities: 5 / Occupants: 5 |
| Total: | Fatalities: 7 / Occupants: 7 |
| Aircraft damage: | Destroyed |
| Aircraft fate: | Written off (damaged beyond repair) |
| Location: | Redwater, TX ( United States of America)
|
| Phase: | En route (ENR) |
| Nature: | Executive |
| Departure airport: | Dallas-Redbird Airport, TX (RBD/KRBD), United States of America |
| Teterboro Airport, NJ (TEB/KTEB), United States of America |
Westwind N50SK departed Dallas-Redbird Airport at 18:56 CST under an IFR flightplan bound for Teterboro.
Upset at FL370 as a result of clear air turbulence associated with a VIP level 6 thunderstorm; entered an uncontrolled descent through the cell. Left main landing gear door broke off due to overstress striking the left horizontal stabilizer which separated.
Probable Cause:
PROBABLE CAUSE:
flight/nav instruments,weather radar system..failure,partial
weather condition..thunderstorm
weather condition..turbulence,clear air
weather condition..gusts
weather condition..downdraft
preflight briefing service..improper..atc personnel(fss)
hazardous weather advisory..not issued..atc personnel(fss)
in-flight weather advisories..not issued..atc personnel(fss)
information unclear..atc personnel(fss)
CONTRIBUTING FACTORS:
operation with known deficiencies in equipment..continued..pilot in command
light condition..dark night
excessive workload (task overload)..pilot in command
excessive workload (task overload)..copilot/second pilot
Accident investigation:
 |
|
Classification:
TurbulenceLoss of control
Sources:
» NTSBFollow-up / safety actions
NTSB issued 4 Safety Recommendations
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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Dallas-Redbird Airport, TX to Teterboro Airport, NJ as the crow flies is 2202 km (1376 miles).
Accident location: Exact; deduced from official accident report.
Distance from Dallas-Redbird Airport, TX to Teterboro Airport, NJ as the crow flies is 2202 km (1376 miles).
Accident location: Exact; deduced from official accident report.
This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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IAI 1124
