SF340B ACFT ENRTE FLC NOTED ELECTRICAL ODOR AND FOUND THE LNDG GEAR CTL CIRCUIT BREAKER POPPED. THEY NOTIFIED THEIR COMPANY AND AT DEST ARPT ATTEMPTED TO RESET THE BREAKER AND LOWER LNDG GEAR. BREAKER POPPED AND NOSE GEAR INDICATED DOWN; BUT MAIN GEAR SHOWED UNSAFE. TWR CTLR RPTED IT APPEARED TO BE DOWN. FLC DIDN'T COMPLETE THE GRAVITY EXTENSION CHKLIST SINCE THEY THOUGHT THE GEAR WAS DOWN. ON LNDG L GEAR COLLAPSED AND ACFT EXITED RWY. NO FIRE. PAX EVACED.

Narrative

DEPARTED DFW FOR LAW (LAWTON; OK) WITH MYSELF IN THE R HAND SEAT AS PNF. DURING CRUISE WE NOTICED A DEFINITE ODOR OF HOT ELECTRICAL COMPONENT. THE SMELL LASTED ONLY A SHORT TIME. SEARCHING FOR THE SOURCE OF THE ODOR WE FOUND THE 'LNDG GEAR CTL' CIRCUIT BREAKER POPPED. I CALLED OUR COMPANY DISPATCH AND MAINT CTL ON THE COMPANY FREQ AND ADVISED THEM OF THE POTENTIAL FOR GEAR PROBS WHEN ARRIVING AT OUR DEST (WHICH WE WERE CLOSER TO THAN DEP ARPT) AND WHICH WAS A COMPANY MAINT BASE. DURING THE VISUAL APCH TO LAW; WHEN IT WAS TIME TO EXTEND THE GEAR THE CIRCUIT BREAKER WAS RESET AND THE GEAR SELECTED DOWN; THE GEAR SOUNDED AND FELT AS A NORMAL EXTENSION HAD BEGUN HOWEVER THE GEAR CTL CIRCUIT BREAKER POPPED AGAIN. WE DID NOT HAVE NORMAL GEAR DOWN INDICATIONS. WE RESET THE BREAKER ONE MORE TIME TO ATTEMPT TO COMPLETE THE EXTENSION CYCLE. THE CIRCUIT BREAKER POPPED AGAIN IMMEDIATELY. ALONG WITH THE SMELL WE INFORMED THE LAW TWR OF OUR PROB AND ASKED TO DO VISUAL L HAND TFC PATTERNS WHILE WE WORKED ON THE PROB; WE ALSO ASKED FOR A VISUAL RPT ON THE GEAR POS FROM THE TWR. THE TWR RPTED THE GEAR APPEARED IN THE NORMAL DOWN POS. I RAN THE CHKLIST FOR 'LNDG GEAR WILL NOT EXTEND.' DURING THIS PROC I CALLED THE MAINT PERSONNEL (COMPANY) ON THE GND IN LAW AND QUESTIONED ONE OF THE STEPS IN THE CHKLIST; WHICH WAS A GRAVITY EXTENSION PROC. BY THIS TIME THE GEAR WAS EXTENDED BUT NOT LOCKED. I DID NOT DO THIS STEP. AFTER COMPLETING THE CHKLIST WE HAD NOSE GEAR DOWN AND LOCKED INDICATION AND BOTH MAIN GEAR UNSAFE INDICATIONS. THEN I DID THE EMER LNDG CHKLIST. WE REQUESTED THE CFR EQUIP; THEN LANDED. UPON TOUCHDOWN THE R MAIN GEAR LOCKED INTO PLACE; THE L DID NOT SUPPORT THE ACFT. WE EVENTUALLY LOST DIRECTIONAL CTL AND CAME TO REST APPROX 150 FT OFF OF THE RWY. THE 3 PAX AND 3 CREW ALL EXITED THE ACFT VIA THE L HAND OVERWING EXIT. THERE WERE NO INJURIES AND NO FIRE. MAINT PERSONNEL HAVE SINCE IDENTED THE FAULTY ELECTRICAL COMPONENT; WHICH STARTED THE SIT. HAD I HAD A MORE THOROUGH UNDERSTANDING OF THE GEAR SYS AND HAD THE 'LNDG GEAR WILL NOT EXTEND' CHKLIST HAVE SOME MINOR CHANGES TO BE MORE CLR; THERE MAY HAVE BEEN A NORMAL LNDG IN THIS CASE.