What was found
ON GEAR RETRACTION, A LOUD BANG WAS HEARD, GEAR UNSAFE LIGHT ON. MAINTENANCE INSPECTED AND FOUND LEFT MAIN GEAR LOWER RETRACT PIN BROKEN. AIRCRAFT APPROVED FOR FERRY FLIGHT TO MCN FOR REPAIR. MAINTENANCE REMOVED AND REPLACED THE LT MAIN LANDING GEAR RETRACT CYLINDER. OPS AND LEAK CHECK GOOD IAW DC8 MM 32-32-2. PERFORMED GEAR SWING OPS AND LEAK CHECK IAW DC8 MM 32-30-0.