What was found
PILOT REPORTED WHILE ENROUTE FROM KBUF TO CYUL, THE CENTER HAD CONTACTED HIM REGARDING A PIECE OF RUBBER FOUND ON THE DEPARTING RUNWAY IN KBUF. REQUESTED A LOW FLY BY TO SEE IF ANY OBVIOUS SIGNS OF DAMAGE COULD BE SEEN, THE GEAR AND WHEELS APPEARED DOWN AND LOCKED” REQUESTED A SECOND LOW PASS FOR FURTHER REASSURANCES. ATC THEN REPLIED ALL LOOKED GOOD. THE PILOT THEN DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT IN CYUL. UPON POST FLIGHT, CONFIRMED THE NUMBER 3 TIRE HAD LOST ITS TREAD. MX INSPECTED THE AIRCRAFT AND R&R THE NR 3 WHEEL TIRE ASSEMBLY WITH AN OVERHAULED UNIT. MX ALSO R&R THE NUMBER 4 WHEEL TIRE ASSEMBLY WITH AN OVERHAULED UNIT. THE AIRCRAFT WAS RETURNED TO SERVICE AND NO SUBSEQUENT ISSUES HAVE BEEN REPORTED.