NTSB Identification: CHI89FA078.
The docket is stored on NTSB microfiche number 42811.
Nonscheduled 14 CFR
Accident occurred Wednesday, April 26, 1989 in MT. ZION, IL
Probable Cause Approval Date: 01/23/1992
Aircraft: CESSNA 208A, registration: N9637F
Injuries: 1 Minor.
NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.
DEPARTED MARION WITHOUT A WX BRIEFING. PLT ADVISED DURING APPROACH THAT LAST PERSON MAKING APPROACH REPORTED MODERATE TO SEVERE TURBULENCE ON FINAL. SUBSEQUENTLY CLEARED TO LAND AND GIVEN WIND 360 AT 30 GUSTING 40. ALSO ADVISED THAT ANOTHER AIRCRAFT REPORTED A 20KT WINDSHEAR ON FINAL. THE PILOT REPORTED THAT WHEN HE HAD DESCENDED TO 1500 FEET MSL, THE AIRCRAFT ENCOUNTERED STRONG TURBULENCE AND THE AIRSPEED WENT FROM STALL TO REDLINE. DESPITE ADJUSTMENT TO FLAPS AND THROTTLE, THE AIRPLANE WAS UNCONTROLLABLE.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: THE PILOT'S INTENTIONAL FLIGHT INTO KNOWN ADVERSE WEATHER. CONTRIBUTING FACTORS WERE THE PILOT'S POOR EVALUATION OF THE WEATHER INFORMATION GIVEN HIM BY THE AIR TRAFFIC CONTROLLERS.
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