FORT MYERS, FL, USA
N1279D
CESSNA 170A
SHORTLY AFTER TAKEOFF AT AN ALT OF ABOUT 80 FT WHILE OVER TREES AT THE DEPARTURE END OF THE RWY, THE PLT REPORTED THAT THE ACFT BEGAN TO SINK & THE LT WING STALLED. THE ACFT DESCENDED LT WING LOW COLLIDED WITH TREES THEN THE GROUND. THE PLT STATED THAT THERE WAS NO ENG FAILURE OR MALFUNCTION & THE STALL WARNING DID NOT OPERATE. HE ALSO STATED THAT THE HIGH SINK RATE WAS DUE TO A DOWNDRAFT. THE PLT RATED PASSENGER STATED THAT JUST PRIOR TO THE WING STALLING, HE OBSERVED THE AIRSPEED INDICATOR ABRUPTLY FELL FROM 60-50 MPH. THE STALL SPEED IN THE ACFT CONFIGURATION WAS REPORTEDLY 54 MPH.
IN-FLIGHT ENCOUNTER WITH A DOWNDRAFT WHICH CAUSED THE AIRSPEED TO DECREASE BELOW VSO RESULTING IN AN INADVERTENT STALL/MUSH.
Source: NTSB Aviation Accident Database
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