What was found
(CAN) ACFT SUSTAINED A MAIN WHEEL TIRE FAILURE NR 1 POSITION. THE TREAD AND CHORD HAD SEPARATED FROM THE TIRE CASING. THE ACFT IS CERTIFIED AND OPERATED FROM GRAVEL RUNWAY SURFACES. THE TIRE IS CONSIDERED AS SCRAP. THE ACFT WAS INSPECTED IAW MM AND RESULTED IN THE NR 1 AND NR 2 WHEEL ASSEMBLIES BEING REPLACED. NR 1 WAS REPLACED DUE TO CONDITION AND NR 2 WAS REPLACED IAW THE MM AS A RESULT OF NR 1 INABILITY TO CARRY/SHARE THE THE ACFT WEIGHT LOAD. THE ACFT HAS BEEN CERTIFIED AND RETURNED TO SERVICE. THE SUSPECTED CAUSE MAY BE ATTRIBUTED TO UNDETECTED GRAVEL DAMAGE DUE TO THE ACFT OPERATION. A WALKAROUND IS CONDUCTED BY A QUALIFIED AME PRIOR TO EACH FLIGHT, AND ANY DAMAGE THAT MAY HAVE OCCURED WAS NOT DETECTED OR VISABLE AT THAT TIME.