What was found
REPLACED FAILED RT ENG INLET ANTI-ICE SHUTOFF VALVE ASSY WITH "0 TSOH" VALVE. NEWLY O/H VALVE CAUSED VIBRATION FELT THROUGH AIRFRAME, BELIEVED TO BE CAUSED BY RAPID VALVE MODULATION. VALVE O/H WO NR R79693 DATED 10/27/2009. THIS IS THE SECOND RECENTLY O/H VALVE INSTALLED IN LAST MONTH FROM SAME FACILITY THAT HAVE HAD SIMILAR FAILURES UPON INSTALLATION OR SHORTLY THEREAFTER. RECOMMEND MFG O/H FACILITY REVIEW RECORDS TO DETERMINE IF A QUALITY CONTROL/POST-MX TESTING ISSUE, OR IF O/H STANDARDS NEED TO BE REVISED.