What was found
DURING TAKEOFF ROLL AIRCRAFT BEGAN TO SHUDDER AT APPROXIMATELY 40 KIAS AND CONTINUED THROUGHT APPROXIMATLEY 60 KIAS TAKEOFF WAS ABORTED AT THAT TIME, SHUDDER CAME FROM NOSEWHEEL. TROUBLESHOT NOSE GEAR SHIMMY TO NOSE TIRES BEING OUT OF ROUND PER THE CITATION X NOSE SHIMMY CHECKLIST. REMOVED LEFT AND RIGHT NOSE WHEEL ASSEMBLIES AND INSTALLED OVERHAULED WHEEL ASSEMBLIES WITH NEW TIRES. WORK PERFORMED IAW CHAPTER 32-41-01 OF THE CITATION 750 M.M.