NTSB Identification: CHI92FA282.
The docket is stored on NTSB microfiche number 48330.
Accident occurred Sunday, September 20, 1992 in OTTAWA, IL
Probable Cause Approval Date: 09/14/1993
Aircraft: CESSNA 152, registration: N4591P
Injuries: 1 Fatal,1 Serious.

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.

SHORTLY AFTER TAKEOFF, THE AIRPLANE WAS OBSERVED TURNING AS IF TO RETURN FOR LANDING. A WITNESS REPORTED OBSERVING IT MANEUVERING TO LINE UP FOR A LANDING ON THE RUNWAY OPPOSITE ITS TAKEOFF RUNWAY. THE WITNESS STATED HE OBSERVED THE AIRPLANE WINGS LEVEL AND MOVING SIDEWAYS. THE AIRPLANE THEN STALLED AND SPUN TO THE GROUND. ON-SCENE INVESTIGATION REVEALED THAT THE LANDING FLAPS WERE FULLY EXTENDED. THE AIRPLANE WAS EQUIPPED WITH AN FAA-APPROVED SHORT TAKEOFF OR LANDING (STOL) WING MODIFICATION. THE HEIGHT OF THE WING FLOW FENCES WERE FOUND TO BE INCORRECT ACCORDING TO THE STC DRAWINGS. AN FAA TEST PILOT STATED THAT HE HAD REQUIRED THAT THE FLOW FENCES BE LOWERED DUE TO AERODYNAMIC INSTABILITIES WITH FENCES TOO HIGH. OTHER SIMILAR AIRPLANES WERE FOUND WITH THE WING FLOW FENCES TOO HIGH. INVESTIGATION INTO THE PILOT'S FLYING HABITS REVEALED THAT HE OFTEN PERFORMED WING'S LEVEL RUDDER TURNS. THE INVESTIGATION ALSO REVEALED A PARTIAL MAGNETO FAILURE WHICH WOULD HAVE RESULTED IN A PARTIAL LOSS OF ENGINE POWER.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

PILOT DID NOT MAINTAIN A PROPER AIRSPEED WHICH LED TO AN INADVERTENT STALL/SPIN AT A LOW ALTITUDE WHERE THE PILOT COULD NOT PERFORM A RECOVERY.

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