RWY EXCURSION DURING LNDG PROC ROLLOUT IN A CASA C212.

Narrative

ON TKOF AT WILLOW RUN ARPT; A NOSEWHEEL SHIMMY WAS DETECTED WHICH IS COMMON ON A CASA 212. THE FLT CONTINUED TO GRAND RAPIDS; MI; WHICH IS APPROX 100 MI AWAY. 10 MINS FROM GRAND RAPIDS; THE IN-RANGE CHKLIST WAS PERFORMED. AT THIS TIME THE NOSEWHEEL OF THE FIXED GEAR CASA WAS ROTATED THROUGH TO BUILD PRESSURE IN THE HYD LINES TO PREVENT SHIMMY ON LNDG. WHILE ROTATING THE NOSEWHEEL IT STUCK FULLY DEFLECTED TO THE R. AT THIS TIME THE CREW AND COMPANY DECIDED THE FLT SHOULD RETURN TO WILLOW RUN WHERE THE SIT COULD BE BETTER DEALT WITH. A FLY-BY WAS PERFORMED TO VERIFY THE NOSEWHEEL POS. UPON LNDG THE NOSEWHEEL WAS SET DOWN TO THE RWY IN AN ATTEMPT TO STRAIGHTEN IT. THEN THE NOSEWHEEL WAS HELD OFF THE RWY AS LONG AS POSSIBLE. BOTH PLTS HELD BACK PRESSURE ON THE ELEVATOR. WHEN THE NOSEWHEEL CONTACTED THE GND THE AIRPLANE TURNED OFF THE R SIDE OF THE RWY UNCONTROLLABLY. L BRAKE AND L REVERSE THRUST WAS USED TO ATTEMPT TO MAINTAIN DIRECTIONAL CTL. NO INJURIES OR PROPERTY DAMAGE RESULTED FROM THESE EVENTS. IT WAS DETERMINED THAT TWO OF THE FOUR BOLTS HOLDING THE NOSEWHEEL ACTUATOR ON HAD SHEARED IN HALF. SUPPLEMENTAL INFO FROM ACN 343445: SINCE THE ACFT RECEIVED NO STRUCTURAL DAMAGE AND NO PROPERTY DAMAGE HAD OCCURRED; THE CREW PROCEEDED WITH A NORMAL SHUT DOWN. THE ACFT WAS TOWED BACK TO THE HANGAR AND INSPECTED. NO PRIORITY WAS GIVEN TO THE ACFT AND NO EMER WAS DECLARED. THE COMPANY WROTE THIS UP AS A MECHANICAL IRREGULARITY; NOT AN ACCIDENT OR INCIDENT.