What was found
(CAN) ACFT DEPARTED, APPROXIMATELY 30 MILES EN ROUTE, PLAY WAS NOTICED IN THE RT RUDDER PEDAL, THERE WAS NO RESISTANCE WHEN DEPRESSED AND WAS INOPERABLE, LT RUDDER WAS STILL FUNCTIONAL. DECISION WAS MADE TO CONTINUE, ACFT LANDED WITHOUT INCIDENT. AFTER FURTHER INSPECTION OF RUDDER CONTROL SYSTEM, A CLEVIS PIN HAD BECOME DETACHED FROM RUDDER CONTROL TORQUE TUBE ABOVE REAR CARGO DOOR. IT APPEARS THE SAFTY CLIP THAT COVERS THE PIN AT BOTH ENDS IS MISSING.