What was found
(CAN) DURING TAKE-OFF, THE CREW REPORT THAT THEY HAD HEARD A BANG. ALL ENGINE PARAMETERS WERE NORMAL. THE AIRCRAFT MADE AN UNSCHEDULED LANDING. ALL ENGINES WERE PHYSICALLY INSPECTED WITH NO APPARENT DAMAGE. ALL 3 ENGINES WERE STARTED, POWERED UP AND REVERSERS DEPLOYED. ALL ENGINES WERE CHECKED SERVICEABLE IAW MM 71-00 AND PWA MM 71-00-00. THE AIRCRAFT WAS RELEASED AND NO FURTHER INCIDENT DURING SUBSEQUENT FLIGHT.