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Accident description
Last updated: 12 December 2017
Status:Final
Date:Friday 4 April 1986
Time:19:22
Type:Silhouette image of generic WW24 model; specific model in this crash may look slightly different
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
Airplane damage: Destroyed
Airplane 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
Destination airport:Teterboro Airport, NJ (TEB/KTEB), United States of America
Narrative:
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:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 10 months
Accident number: FTW86MA058
Download report: Summary report

Classification:
Turbulence
Loss of control

Sources:
» NTSB


Follow-up / safety actions

NTSB issued 4 Safety Recommendations

Show all AD's and 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.

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

  • 442 built
  • 4th loss
  • 2nd fatal accident
  • The worst accident
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