What was found
(CAN) DURING MAINTENANCE RUNS WHEN THE AIRCRAFT NOSE WHEEL STEERING WAS SELECTED ON, THE NOSE WHEELS WOULD TURN UNCOMMANDED FULL LEFT. MAINTENANCE TROUBLESHOOTING FOUND THE RVDT`S WERE OUT OF RIG AND FURTHER TROUBLESHOOTING FOUND THE CENTER SPUR GEAR SHAFT THAT DRIVES THE RVDT`S MOVED FREELY WHEN IT SHOULD NOT AND CAUSED THE RVDT`S TO MISREPORT THE WHEELS POSITION. THIS CENTER SPUR GEAR SHAFT IS INTERNAL TO THE NOSE LANDING GEAR ASSY AND REQUIRED THE REPLACEMENT OF THE NOSE LANDING GEAR. P/N: 47100-19 S/N: MA0190 TSN HOURS: 16387 , CYCLES: 16131 A/C HOURS: 16387 A/C CYCLES: 16131. (TC NR 20180117007).