What was found
(CAN) AFTER TAKEOFF WITH A POSITIVE RATE OF CLIMB THE GEAR HANDLE WAS SELECTED UP. A LOUD BANG WAS HEARD AND THE "GEAR UNLOCKED" LIGHT REMAINED ILLUMINATED. THE LOAD WAS JETTISONED AT THE DESIGNATED ABORT SITE. THREE GEAR DOWN SOURCES WERE OBTAINED AFTER SELECTING THE GEAR HANDLE DOWN. 1)THREE GREEN GEAR DOWN AND LOCKED LIGHTS. 2)VISUAL OUTSIDE INDICATION FROM TANKER 45. 3)VISUAL INSPECTION THRU THE NOSE WHEEL WELL VIEWING WINDOW BY EACH CREW MEMBERS SEPARATELY. FLIGHT CREW ADVISED EMERGENCY SERVICES WERE OFFERED BY FSS AND ACCEPTED BY THE AIRCREW. ALL CHECKS COMPLETED, LANDED WITHOUT INCIDENT.