What was found
NOTICING HIGH FAILURE RATE BETWEEN SHAFT (PN 2601267-2) AND GEAR (PN 3100450-01) LESS THAN 1,000 HRS. WHEN REPLACING GEAR WITH MFG O/H GEAR, NEW SHAFT DOES NOT FIT INTO GEAR. TRIED OTHER ACFT MFG NEW AIR CONDITIONER DRIVE SHAFTS AND THEY INSTALLED WITH NO PROBLEM. THIS IS THE 3RD MFG SHAFT/GEAR REPLACEMENT THIS YEAR, ENCOUNTERED SAME PROBLEM WITH EACH INSTALL. THE PROBLEM WAS CORRECTED BY INSTALLNG SEVERAL DIFFERENT SHAFTS, (PN 2601267-2), UNTIL THE CORRECT FIT COULD BE ACHIEVED.