MOUNT ALTON, PA, USA
N9511H
CESSNA 172H
WHILE ENROUTE THE PLT REPORTED HE WAS ICING UP & WOULD HAVE TO DIVERT TO BRADFORD. ABOUT 12 MI FROM THE ARPT THE PLT DECLARED AN EMERGENCY STATING HE DIDN'T THINK HE COULD MAKE A MISSED APPROACH WITH THE ICE BUILDUP. THE PLT THEN REPORTED A ROUGH ENGINE & AN AIRSPEED OF ABOUT 70K WITH FULL THROTTLE. JUST PRIOR TO THE CRASH THE PLT REPORTED THAT HE HAD SO MUCH ICE ON HIS WINDSHIELD THAT HE COULDN'T SEE. THE ACFT CRASHED ABOUT 1 MI SHORT OF RWY 32. COATING THE LEADING EDGE OF THE LEFT HORIZONTAL STABILIZER WAS AN ICE BUILDUP WHICH TAPERED IN THICKNESS FROM 1/4 INCH AT THE ROOT TO ABOUT 1-1/2 INCHES AT THE TIP. PIECES OF 3/4 TO ONE INCH THICK ICE WERE FOUND IN THE GROUND SCAR FOUND UNDER THE RIGHT WING. ICING CONDITIONS WERE FORECASTED ALONG THE ROUTE OF FLT.
Source: NTSB Aviation Accident Database
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