What was found
(CAN) AFTER TAKE-OFF RT GEAR INDICATION INDICATED RT GEAR NOT RETRACTED. GEAR WAS CYCLED DOWN AND THEN INDICATED NOT DOWN AND LOCKED. SUBSEQUENT RE-CYCLE PRODUCED SAME RESULT (NO GREEN FOR RT SIDE AND INTRANSIT LIGHT ON IN GEAR HANDLE). OBSERVATION DURING AIRCRAFT FLY-BY SHOWED GEAR IN DOWN AND LOCKED POSITION. ON THE LANDING ROLL, RT GEAR RETRACTED UNDER THE WEIGHT OF THE AIRCRAFT. INVESTIGATION UNDERWAY.