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Springboro, OH
ACFT WAS BEING FLOWN BY OWNER ON 1ST FLT AFTER ENGINE CASE HAD BEEN SPLIT, VALVE REPAIR, & CARBURETOR FLOAT REPLACEMENT. AUTO FUEL WAS BEING USED WHICH WAS PUT IN ACFT ABOUT SIX WEEKS BEFORE ACCIDENT. NO CONTAMINATION WAS FOUND IN FUEL, ENGINE WAS RUN ON TEST CELL, & CARB WAS FLOW CHECKED AFTER ACCIDENT. PIC RPTED LONG TAXI TO TAKE OFF RWY PLUS DELAY DUE TO OTHER TRAFFIC. FAA AC 91-33A NOTES CARB ICE WILL FORM AT HIGHER TEMP & MORE RAPIDLY THAN AV GAS. ICE PROBABILITY CHART SHOWED WX COND CONDUCIVE TO CARB ICE WITH USE OF AV GAS. FAA AC 20-113 RECOMMENDS USING CARB HEAT PRIOR TO TAKE OFF WHEN COND ARE CONDUCIVE TO CARB ICE TO REMOVE ANY ICE BUILT UP.
LOSS OF POWER (TAKEOFF) FROM CARBURETOR ICE DUE TO IMPROPER USE OF CARBURETOR HEAT DURING EXTENDED GROUND OPERATION USING AUTO FUEL IN WEATHER WHICH WAS CONDUCIVE TO ICING.
ACFT WAS BEING FLOWN BY OWNER ON 1ST FLT AFTER ENGINE CASE HAD BEEN SPLIT, VALVE REPAIR, & CARBURETOR FLOAT REPLACEMENT. AUTO FUEL WAS BEING USED WHICH WAS PUT IN ACFT ABOUT SIX WEEKS BEFORE ACCIDENT. NO CONTAMINATION WAS FOUND IN FUEL, ENGINE WAS RUN ON TEST CELL, & CARB WAS FLOW CHECKED AFTER ACCIDENT. PIC RPTED LONG TAXI TO TAKE OFF RWY PLUS DELAY DUE TO OTHER TRAFFIC. FAA AC 91-33A NOTES CARB ICE WILL FORM AT HIGHER TEMP & MORE RAPIDLY THAN AV GAS. ICE PROBABILITY CHART SHOWED WX COND CONDUCIVE TO CARB ICE WITH USE OF AV GAS. FAA AC 20-113 RECOMMENDS USING CARB HEAT PRIOR TO TAKE OFF WHEN COND ARE CONDUCIVE TO CARB ICE TO REMOVE ANY ICE BUILT UP.