What was found
AT FL 350 IN LIGHT CHOP, RECEIVED HIGH SPEED AURAL WARNING FOR APPROX 2 SECONDS. MAX SPEED OBSERVED WAS 283 KTS, HIGHEST MACH OBSERVED UNKNOWN-C/A-PERFORMED OVERSPEED PHASE I INSPECTION AND DEFERRED FDR ANALYSIS IAW EMB 175 AMM 05-50-06. NO DISCREPANCIES NOTED. OPENED TDMI 057T0566