PLT OF A FOKKER 100 REJECTED TKOF AT 70 KTS DUE TO SEVERE NOSE GEAR VIBRATION.

Narrative

AFTER STARTING OUR INITIAL TKOF ROLL; A HVY VIBRATION WAS NOTICED COMING FROM THE NOSE GEAR. IT SUBSIDED SLIGHTLY AND THEN BECAME A SEVERE VIBRATION. THE CAPT WAS FLYING AND HE CALLED 'REJECT' AT ABOUT 70 KTS. I CALLED THE REJECT TO THE TWR AND WE TAXIED CLR OF THE RWY. THE PAX AND FLT ATTENDANTS WERE INFORMED TO REMAIN SEATED AND WE TAXIED BACK TO THE GATE. THE VIBRATION WAS SO STRONG; THE #2 IRS DROPPED OUT OF ALIGNMENT AND THE FO'S PRIMARY FLT DISPLAY AND NAV DISPLAY DROPPED OFF AS WELL. THIS WAS A LITTLE DIFFERENT BECAUSE THE FO'S SIDE DISPLAYED NO AIRSPD OR HDG GUIDANCE. HOWEVER; DUE TO OUR ANNUAL CRM AND SEMI-ANNUAL SIMULATOR TRAINING; WE BOTH KNEW WHAT WAS EXPECTED OF EACH OF US AND THE TRAINING MADE IT MORE INSTINCTIVE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATES THE CORRECTIVE ACTION AS RPTED BY MAINT WAS A NOSE STRUT FOUND OVERSVCED; NOSEWHEEL AND TIRE REPLACED AND THE TORQUE LINKS TIGHTENED. RPTR ADVISES IN 4 YRS OF FLYING THE FK100 A VIBRATION OF THIS MAGNITUDE WAS NEVER EXPERIENCED.