LR25 CLBING TO FL350; FO NOTED L ENG FIRE WARNING FLASHED MOMENTARILY. REDUCED TO IDLE; DIVERTED TO CLE AND REQUESTED LOWER. FL290 FIRE WARNING ON L ENG AGAIN; SHUT DOWN AND SHOT BOTH FIRE BOTTLES TO L ENG. WARNING FINALLY WENT OUT. LANDED CLE OK.

Narrative

I DEPARTED PONTIAC; MI; ENRTE TO WASHINGTON DULLES INTL ARPT AT XA30. DURING OUR CLB OUT OF FL330 FO SAID THAT HE SAW A FLASH OF THE L-HAND FIRE DETECTION LIGHT COME ON. HE WAS FLYING AT THE TIME SO HE REDUCED THE PWR ON THAT ENG AND THE LIGHT STAYED OUT. AFTER TALKING IT OVER I DECIDED THAT IT WOULD BE BEST THAT WE DIVERT TO AN ARPT THAT WAS WELL SUITED FOR A POSSIBLE EMER. USING THE GPS TO FIND ARPTS THAT WERE AHEAD OF US WAS DONE; AND CLEVELAND WAS THE BEST CHOICE THAT WAS AVAILABLE. AT THIS TIME I TOLD ZOB THAT WE HAD A PROB AND THAT WE WOULD LIKE TO GO TO CLE. THEY ASKED IF WE WOULD LIKE TO DECLARE AN EMER; BUT AT THE TIME THIS WAS NOT NECESSARY. WE WERE THEN GIVEN A CLRNC TO PROCEED DIRECT CLE AND TO DSND TO FL260. I THEN ADVISED OUR PAX THAT WE DID HAVE A PROB WITH THE L ENG AND THAT WE WERE GOING TO LAND AT CLE AND HAVE IT LOOKED AT. AT FL290 DURING THE DSCNT; THE L FIRE WARNING LIGHT CAME ON AND STAYED ON WITH THE PWR AT FLT IDLE. I ADVISED FO TO SHUT THE L ENG DOWN; WHICH HE DID; BUT THE FIRE INDICATION STILL EXISTED. I TOLD HIM TO ARM THE FIRE BOTTLE AND SHOOT THE FIRST OF THE EXTINGUISHERS INTO THE L ENG. AFTER COMPLETING THE EMER CHK AND WAITING FOR ABOUT 1 1/2 MINS; THE SECOND FIRE BOTTLE WAS EXTINGUISHED INTO THE L ENG. AFTER AN ADDITIONAL 3 MINS HAD PAST; THE FIRE LIGHT FINALLY WENT OUT. DURING THE CHKLISTS THE L FIREWALL SHUTOFF CIRCUIT BREAKER POPPED OUT AND ONE RESET WAS ATTEMPTED BUT IT WOULD NOT STAY RESET. THE FIREWALL SHUTOFF PIN LIGHT ON THE GLARE SHIELD PANEL DID COME ON INDICATING THAT IT DID SHUT. AFTER ALL THE CHKLISTS WERE DONE AND THE PAX WERE INFORMED OF WHAT WAS HAPPENING WE LANDED AT CLE WITHOUT ANY PROBS. THE ACFT WAS EVACED AND NO ONE WAS INJURED ON THE GND OR IN THE AIR. THE FIRE COMPANY SURROUNDED THE ACFT BUT NO ACTION WAS NEEDED OR TAKEN BY THEM. AS SOON AS THE PAX WERE TAKEN CARE OF; I ADVISED OUR DISPATCH OF WHAT HAD HAPPENED AND THEY TOOK CARE OF THINGS FROM THEIR END. I TALKED WITH ZOB; THE CLE TWR; THE COUNTY AND THE FAA.