What was found
(CAN) PILOT PROCEEDED TO TAXI AIRCRAFT, THE NOSE STEERING SYSTEM LOCKED INTO A HARD RT CONDITION. THIS ALSO AFFECTED THE RUDDER SYSTEM, POSITIONING THE RUDDER SYSTEM INTO A RT TURN CONDITION. A TOW BAR WAS ATTACHED AND THE NOSE STEERING SYSTEM EXERCISED, THIS RESULTED IN RELEASING THE NOSE STEERING SYSTEM / RUDDER CONTROL. NOSE STEERING LINK WAS REMOVED, DISASSEMBLED, INSPECTED, LUBRICATED, REASSEMBLED AND REINSTALLED. INSPECTION OF STEERING LINK DID NOT REVEAL ANYTHING CONCLUSIVE. A DETAILED INSPECTION OF THE RUDDER CONTROL SYSTEM DID NOT REVEAL ANY PROBLEMS. AS A PRECAUTION THE STEERING LINK FORWARD ROD ASSEMBLY WAS REPLACED.