What was found
(CAN) AIRCRAFT WAS RETURNING TO BASE WHEN THE NR 1 GENERATOR FAILED. FLIGHT WAS CONTINUED WITHOUT FURTHER PROBLEMS. WHEN MAINTENANCE REMOVED THE GENERATOR FOR REPLACEMENT THE QUILL SHAFT WAS FOUND SHEARED AND THE FORWARD BEARING ON THE GENERATOR SUFFERED A CATASTROPHIC FAILURE AND WAS COMPLETELY DESTROYED. THE GENERATOR HAD JUST BEEN INSTALLED 102 HOURS PREVIOUSLY FRESH FROM OVERHAUL FACILITY. ANOTHER GENERATOR WAS INSTALLED AND CHECKED SERVICEABLE. (TC 20070202012)