What was found
RIGHT MAIN GEAR DOOR LIGHT DID NOT EXTINGUISH AFTER TAKEOFF RETRACTION, GEAR WAS CYCLED DOWN, NO GEAR SAFE-LIGHT ON RT MAIN. FLY-BY INSPECTION VERIFIED GEAR (RT) NOT EXTENDING. GEAR-UP LANDING HAD TO BE MADE. AT RECOVERY OF AIRCRAFT FROM RUNWAY, RT FORWARD GEAR INBOARD DOOR HINGE BRACKET WAS FOUND BROKEN AND DOOR LOCKED IN WELL. PASSENGERS OK. SUBMITTER RECOMMENDED AD TO IMPROVE INBOARD DOORS IAW SB 70-073-32 IMMEDIATELY.