A CARGO PLT; FLARING DURING LNDG; REALIZED HIS GEAR WAS NOT DOWN EVEN THOUGH 3 GREEN LIGHTS WERE INDICATED. HE SENSED A 'SPLIT SECOND' PROP STRIKE ON THE R; AT WHICH TIME HE WENT AROUND. THE TWR SIMULTANEOUSLY STATED; 'NO LNDG GEAR DOWN.'

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DURING A NORMAL APCH TO LNDG; ON THE DOWNWIND LEG; THE LNDG GEAR SWITCH WAS PUSHED DOWN TO EXTEND THE GEAR AND THE FLAP SWITCH WAS PUSHED DOWN TO EXTEND THE 'FIRST NOTCH' OF FLAPS. UPON TURNING A L BASE TO RWY 9L; THE FLAPS WERE EXTENDED TO THE 'SECOND NOTCH' OF FLAPS AND THE LNDG CHKLIST COMPLETED. UPON TURNING FINAL; FULL FLAPS WERE APPLIED AND A NORMAL APCH TO LNDG INITIATED. AT SOME POINT DOWN THE RWY; I DECIDED THAT THERE WAS EVIDENTLY A LNDG GEAR EXTENSION MALFUNCTION. AT THIS TIME THE R PROP STRUCK THE RWY FOR 1 SPLIT SECOND; AT WHICH TIME I DECIDED TO GO AROUND. ALMOST AT THE SAME TIME; THE TWR DECLARED; 'NO LNDG GEAR DOWN.' AS PWR WAS APPLIED; THE GAR/MISSED APCH SEQUENCE WAS INITIATED. AT THIS TIME I LOOKED AT THE LNDG GEAR INDICATOR AND IT WAS GREEN. THE LNDG GEAR WAS NOT DOWN. AS I CLBED OUT; THE GEAR LEVER WAS RAISED AND THE ELECTRICAL SYS IMMEDIATELY HAD AN OVERLOAD AS AMMETERS 'PEGGED.' I CLBED TO 1000 FT DOWNWIND AND PUT THE GEAR LEVER IN DOWN POS. THE TWR WAS ASKED FOR VISUAL AND THE ANSWER WAS 'NEGATIVE.' THE GEAR DOWN LIGHT (GREEN) WAS ILLUMINATED. AT THIS TIME I ADVISED THAT I WOULD CONTINUE DOWNWIND TO THE W TO TRY TO SOLVE THIS PROB. THE EMER LNDG GEAR EXTENSION SEQUENCE WAS INITIATED. HOWEVER; WHEN I TRIED TO CRANK THE GEAR DOWN; IT WAS EXCEEDINGLY DIFFICULT TO TURN THE HANDLE TO CRANK THE GEAR DOWN. SOMETHING WAS WRONG; JAMMED -- NOT RIGHT. AFTER SEVERAL TURNS; THE GEAR FREE FELL DOWN. THE LNDG GEAR UP LIGHT DID NOT ILLUMINATE AND THE GREEN LIGHT STAYED ON THROUGHOUT THE ORDEAL. THE GEAR WAS DETERMINED DOWN AND LOCKED BY A LOW FLY-BY BY THE TWR; AFTER WHICH AN UNEVENTFUL LNDG WAS ACCOMPLISHED. I BELIEVE MY JUDGEMENTS; DECISIONS; PERCEPTIONS AND ACTIONS WERE RIGHT ON; AS THIS SCENARIO WAS A SETUP FOR BAD RESULTS. THERE IS NO WAY TO PHYSICALLY SEE THE GEAR DOWN. THERE WAS A PROB WITH RETRACT SYS SOMEWHERE. I WAS WELL RESTED; AS I DID ONLY FLY THIS FLT ON THIS DAY. I HAD APPROX 20 HRS REST PREVIOUSLY.