PA34 FLC MAKES EMER LNDG AFTER UNSAFE GEAR DOWN INDICATION IS RESOLVED.

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DURING STALL PRACTICE IN PREPARATION FOR MY ATP; WE EXTENDED THE GEAR AND ONLY GOT 2 GREEN INDICATIONS (R MAIN GEAR WAS THE ONE NOT LOCKED). WE DISCONTINUED THE STALL AND TROUBLESHOT; INCLUDING CYCLING THE GEAR SEVERAL TIMES AND USED THE POH PROCS (STANDARD NAV LIGHT; CIRCUIT BREAKERS; ETC). AFTER CONTACTING MAINT; WE PULLED THE CIRCUIT BREAKER FOR THE GEAR PUMP AND TRIED A FREEFALL EMER EXTENSION. STILL ONLY 2 GREEN. WE LEFT THE HANDLE OUT AND CALLED VERO BEACH TWR TO ASK FOR A LOW FLY-BY SO MAINT COULD LOOK AT THE GEAR. BOTH TWR AND MAINT RPTED THAT THE GEAR APPEARED TO BE FULLY EXTENDED. WE DECLARED AN EMER AND ATTEMPTED A LNDG. MY SAFETY PLT/CFI (FOR ATP WORK) WAS HANDLING THE RADIOS AND I WAS FLYING. HE SAID HE WOULD NOT TOUCH ANYTHING; ONLY CALL THE GAR IF HE SAW ANY REASON TO DO SO. WE TOUCHED DOWN ON THE L; THEN THE R AND IT STARTED COLLAPSING. HE CALLED GAR AND I INITIATED IT. WE CAME OFF THE GND WELL BELOW 79 KIAS; OUR VR. WHEN I SAW THE AIRSPD INDICATOR; I THINK IT WAS 65 KIAS (VMC IS 66; VSO IS 64 AND VS IS 67). WE ACCELERATED IN GND EFFECT AND SUCCESSFULLY CLBED OUT. MAINT (WE DEPARTED THE CLASS D FOR A SHORT TIME TO TROUBLESHOOT) ASKED US TO TRY IT WITH THE PUMP BREAKER IN; HOPING THE GEAR WOULD BE PUSHED IN ON LNDG. ON THE SECOND ATTEMPT; THE GEAR STARTED COLLAPSING AND WE DID ANOTHER GAR. AFTER ANOTHER CONFERENCE WITH MAINT; WE TRIED EVERYTHING AGAIN (PROBABLY CYCLED THE GEAR 25-35 TIMES ALTOGETHER; INCLUDING SEVERAL FREE FALLS); AND FISHTAILED IT FOR AT LEAST THE THIRD TIME AND IT LOCKED INTO PLACE. WE MADE AN UNEVENTFUL LNDG; ALTHOUGH WE DID DECLARE A THIRD EMER. MAINT TOLD US LATER THAT THE J-HOOK WASN'T ABLE TO EXTEND FAR ENOUGH TO LOCK IT INTO PLACE AS THE TRUNION FROZE. WHEN THEY FREE FELL IT ON JACKS; THEY WERE UNABLE TO GET IT TO LOCK; EVEN USING WRENCHES AND ALL THE FORCE POSSIBLE. IN RETROSPECT; I'M NOT SURE IF GOING AROUND WAS THE BEST OPTION. I HAVE ALMOST 350 HRS IN THE SENECA AND MY COPLT HAS 250 HRS. WE WERE RIGHT AT BOTH STALL AND VMC (ALTHOUGH THE STALL HORN NEVER SOUNDED). I DON'T KNOW WHAT THE BEST DECISION WOULD HAVE BEEN. THE PROPS ARE 8-12 INCHES OFF THE GND (3-BLADED) AND COULD'VE BROKEN OFF AND SLICED OPEN THE FUEL TANKS. BUT I ALSO COULD'VE HAD A PROP STRIKE IN THE GAR AND WHO KNOWS WHAT WOULD'VE HAPPENED THEN.