SPI ENCOUNTERS WIND GUSTS ON LNDG HAS LOSS OF ACFT CTL.

Narrative

AS I REMEMBER THE WINDS WERE RPTED AS CALM OR MARGINAL. ABOUT 1/2 MI FROM TOUCHDOWN; I NOTICED A XWIND COMPONENT FROM THE R. AFTER THE ANALYSIS OF THIS I CORRECTED FOR THE XWIND AND WAS BACK ON FOR THE APCH. RIGHT BEFORE TOUCHDOWN I BROUGHT THE PLANE OUT OF THE CORRECTION AND HAD A SOFT LNDG (NO BOUNCE) ON THE BACK; 2 TIRES. BEFORE THE NOSE COULD TOUCHDOWN; A XWIND HIT THE FRONT R QUADRANT OF THE PLANE; PUSHING THE NOSE. THE PLANE ATTEMPTED TO DROP ITS FRONT L QUADRANT. AT THIS TIME I TRIED TO RAISE THE NOSE; AND GAINED ALT. THE ACFT HAD HOWEVER SLOWED DOWN TOO MUCH TO GAIN MUCH ALT AND I WAS AFRAID OF WHAT THE PLANE WOULD DO AT THAT SLOW OF AN AIRSPD SO LOW TO THE GND. AT THIS TIME I TRIED TO SETTLE THE PLANE BACK DOWN AND PULLED THE THROTTLE BACK. I SLOWLY BRAKED AS NECESSARY AS NOT TO FLIP OR GND LOOP. WHEN THE PLANE CAME TO A STOP THE PROP WAS STILL SPINNING BECAUSE I DIDN'T HAVE THE TIME TO PULL THE MIXTURE ALL THE WAY OUT. I PERFORMED MY ACFT SHUTDOWN PROCS; AND AFTERWARDS TURNED THE MASTER AND AVIONICS SWITCHES BACK ON; SO AS TO COMMUNICATE WITH TWR FURTHER. I LEFT BOTH SWITCHES ON UNTIL THE FIREMEN ARRIVED AND THEN TURNED THEM OFF SO AS TO NOT SET OFF ANY LIVE MAGNETO. BEFORE TURNING OFF THE RADIO I HEARD TWR STILL RPTING CALM WIND WHEN THE WINDSOCK TO MY L WAS NOW BLOWING TO THE W STEADILY. THE INCIDENT OCCURRED SIMPLY BECAUSE A FREAK WIND GUST.