What was found
ABORTED APPROACH AND CYCLED THE GEAR ON A GO-AROUND. WHEN GEAR WAS EXTENDED, RIGHT MAIN GEAR UNSAFE LIGHT DID NOT COME ON. RIGHT LANDING GEAR GREEN LIGHT DID NOT COME ON. PROX INDICATION WAS NORMAL. PROBLEM VERIFIED. FOUND NR 5 PIN ON RIGHT MAIN LANDING GEAR DOWNLOCK CONNECTOR PUSHED BACK INTO RECEPTICAL. PROPERLY LOCKED NR 5 PIN INTO POSITION. ALL RIGHT MAIN LANDING GEAR INDICATION LIGHTS OPERATED NORMALLY. PERFORMED ADJUSTMENT CHECK OF LANDING GEAR POSITION AND WARNING IAW DC-9 MM 32-60-00-2. OPS CHECKED GOOD.