A COMMERCIAL FIXED WING MLG ACFT AFTER PARKING AT A GATE HAD THE L OUTBOARD BRAKE OVERHEAT CAUSING FUSE PLUGS TO MELT AND AXLE AND BEARING GREASE TO IGNITE.

Narrative

ACR FLT XYZ SCHEDULED BOS-EWR. AIR RETURN TO BOS DUE TO ENRTE WX AND INABILITY TO GET THROUGH OR AROUND SEVERE TSTMS. AFTER LNDG IN BOS AND DURING TAXI-IN NOTICED L OUTBOARD BRAKE TEMP WARMER THAN OTHER THREE. AS WE APCHED RAMP WE NOTIFIED MAINT THAT WE HAD POTENTIAL HOT BRAKE. TEMP NOW ABOUT 200 DEGS C. AFTER SHUTTING DOWN AT GATE; L BRAKE OVERHEATED. CALLED FOR CFR WHO RESPONDED BY MONITORING BRAKE. I OBSERVED BRAKE AND WHEEL ASSEMBLY SMOKING AND WHEN FUSE PLUGS MELTED TIRE WENT FLAT. AFTER COMPLETING PAPERWORK I RETURNED TO ACFT AND OBSERVED CFR GONE; AND BRAKE COOL ENOUGH THAT I COULD PUT MY HANDS CLOSE TO IT. (ABOUT 15 MINS?) BRAKE WAS NO LONGER SMOKING AND COCKPIT TEMP WAS UNDER 200 DEGS. APPARENTLY ABOUT 45 MINS LATER SOME GREASE ON THE BRAKE OR BEARING IGNITED STARTING A SMALL FIRE WHICH WAS EXTINGUISHED BY RAMP PERSONNEL. THE POINT OF THIS NARRATIVE IS JUST BECAUSE BRAKE HAD COOLED DOESN'T MEAN SOMETHING ELSE CAN'T HEAT UP AND GO ON FIRE. ALSO CFR SHOULD HAVE LEFT A TRUCK TO MONITOR BRAKE LONGER.